[llvm] r211093 - ConvertUTF tests: remove uses of initializer lists to restore compatibility

Dmitri Gribenko gribozavr at gmail.com
Tue Jun 17 02:33:24 PDT 2014


Author: gribozavr
Date: Tue Jun 17 04:33:24 2014
New Revision: 211093

URL: http://llvm.org/viewvc/llvm-project?rev=211093&view=rev
Log:
ConvertUTF tests: remove uses of initializer lists to restore compatibility
with MSVC

Modified:
    llvm/trunk/unittests/Support/ConvertUTFTest.cpp

Modified: llvm/trunk/unittests/Support/ConvertUTFTest.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/unittests/Support/ConvertUTFTest.cpp?rev=211093&r1=211092&r2=211093&view=diff
==============================================================================
--- llvm/trunk/unittests/Support/ConvertUTFTest.cpp (original)
+++ llvm/trunk/unittests/Support/ConvertUTFTest.cpp Tue Jun 17 04:33:24 2014
@@ -11,6 +11,7 @@
 #include "gtest/gtest.h"
 #include <string>
 #include <vector>
+#include <utility>
 
 using namespace llvm;
 
@@ -65,6 +66,39 @@ TEST(ConvertUTFTest, HasUTF16BOM) {
   EXPECT_FALSE(HasBOM);
 }
 
+struct ConvertUTFResultContainer {
+  ConversionResult ErrorCode;
+  std::vector<unsigned> UnicodeScalars;
+
+  ConvertUTFResultContainer(ConversionResult ErrorCode)
+      : ErrorCode(ErrorCode) {}
+
+  ConvertUTFResultContainer
+  withScalars(unsigned US0 = 0x110000, unsigned US1 = 0x110000,
+              unsigned US2 = 0x110000, unsigned US3 = 0x110000,
+              unsigned US4 = 0x110000, unsigned US5 = 0x110000,
+              unsigned US6 = 0x110000, unsigned US7 = 0x110000) {
+    ConvertUTFResultContainer Result(*this);
+    if (US0 != 0x110000)
+      Result.UnicodeScalars.push_back(US0);
+    if (US1 != 0x110000)
+      Result.UnicodeScalars.push_back(US1);
+    if (US2 != 0x110000)
+      Result.UnicodeScalars.push_back(US2);
+    if (US3 != 0x110000)
+      Result.UnicodeScalars.push_back(US3);
+    if (US4 != 0x110000)
+      Result.UnicodeScalars.push_back(US4);
+    if (US5 != 0x110000)
+      Result.UnicodeScalars.push_back(US5);
+    if (US6 != 0x110000)
+      Result.UnicodeScalars.push_back(US6);
+    if (US7 != 0x110000)
+      Result.UnicodeScalars.push_back(US7);
+    return Result;
+  }
+};
+
 std::pair<ConversionResult, std::vector<unsigned>>
 ConvertUTF8ToUnicodeScalarsLenient(StringRef S) {
   const UTF8 *SourceStart = reinterpret_cast<const UTF8 *>(S.data());
@@ -73,17 +107,55 @@ ConvertUTF8ToUnicodeScalarsLenient(Strin
   std::vector<UTF32> Decoded(S.size(), 0);
   UTF32 *TargetStart = Decoded.data();
 
-  auto Result =
+  auto ErrorCode =
       ConvertUTF8toUTF32(&SourceNext, SourceStart + S.size(), &TargetStart,
                          Decoded.data() + Decoded.size(), lenientConversion);
 
   Decoded.resize(TargetStart - Decoded.data());
 
-  return std::make_pair(Result, Decoded);
+  return std::make_pair(ErrorCode, Decoded);
 }
 
-#define R0(RESULT) std::make_pair(RESULT, std::vector<unsigned>{})
-#define R(RESULT, ...) std::make_pair(RESULT, std::vector<unsigned>{ __VA_ARGS__ })
+std::pair<ConversionResult, std::vector<unsigned>>
+ConvertUTF8ToUnicodeScalarsPartialLenient(StringRef S) {
+  const UTF8 *SourceStart = reinterpret_cast<const UTF8 *>(S.data());
+
+  const UTF8 *SourceNext = SourceStart;
+  std::vector<UTF32> Decoded(S.size(), 0);
+  UTF32 *TargetStart = Decoded.data();
+
+  auto ErrorCode = ConvertUTF8toUTF32Partial(
+      &SourceNext, SourceStart + S.size(), &TargetStart,
+      Decoded.data() + Decoded.size(), lenientConversion);
+
+  Decoded.resize(TargetStart - Decoded.data());
+
+  return std::make_pair(ErrorCode, Decoded);
+}
+
+::testing::AssertionResult
+CheckConvertUTF8ToUnicodeScalars(ConvertUTFResultContainer Expected,
+                                 StringRef S, bool Partial = false) {
+  ConversionResult ErrorCode;
+  std::vector<unsigned> Decoded;
+  if (!Partial)
+    std::tie(ErrorCode, Decoded) = ConvertUTF8ToUnicodeScalarsLenient(S);
+  else
+
+    std::tie(ErrorCode, Decoded) = ConvertUTF8ToUnicodeScalarsPartialLenient(S);
+  if (Expected.ErrorCode != ErrorCode)
+    return ::testing::AssertionFailure() << "Expected error code "
+                                         << Expected.ErrorCode << ", actual "
+                                         << ErrorCode;
+
+  if (Expected.UnicodeScalars != Decoded)
+    return ::testing::AssertionFailure()
+           << "Expected lenient decoded result:\n"
+           << ::testing::PrintToString(Expected.UnicodeScalars) << "\n"
+           << "Actual result:\n" << ::testing::PrintToString(Decoded);
+
+  return ::testing::AssertionSuccess();
+}
 
 TEST(ConvertUTFTest, UTF8ToUTF32Lenient) {
 
@@ -92,25 +164,27 @@ TEST(ConvertUTFTest, UTF8ToUTF32Lenient)
   //
 
   // U+0041 LATIN CAPITAL LETTER A
-  EXPECT_EQ(R(conversionOK, 0x0041),
-      ConvertUTF8ToUnicodeScalarsLenient("\x41"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x0041), "\x41"));
 
   //
   // 2-byte sequences
   //
 
   // U+0283 LATIN SMALL LETTER ESH
-  EXPECT_EQ(R(conversionOK, 0x0283),
-      ConvertUTF8ToUnicodeScalarsLenient("\xca\x83"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x0283),
+      "\xca\x83"));
 
   // U+03BA GREEK SMALL LETTER KAPPA
   // U+1F79 GREEK SMALL LETTER OMICRON WITH OXIA
   // U+03C3 GREEK SMALL LETTER SIGMA
   // U+03BC GREEK SMALL LETTER MU
   // U+03B5 GREEK SMALL LETTER EPSILON
-  EXPECT_EQ(R(conversionOK, 0x03ba, 0x1f79, 0x03c3, 0x03bc, 0x03b5),
-      ConvertUTF8ToUnicodeScalarsLenient(
-          "\xce\xba\xe1\xbd\xb9\xcf\x83\xce\xbc\xce\xb5"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK)
+          .withScalars(0x03ba, 0x1f79, 0x03c3, 0x03bc, 0x03b5),
+      "\xce\xba\xe1\xbd\xb9\xcf\x83\xce\xbc\xce\xb5"));
 
   //
   // 3-byte sequences
@@ -118,13 +192,15 @@ TEST(ConvertUTFTest, UTF8ToUTF32Lenient)
 
   // U+4F8B CJK UNIFIED IDEOGRAPH-4F8B
   // U+6587 CJK UNIFIED IDEOGRAPH-6587
-  EXPECT_EQ(R(conversionOK, 0x4f8b, 0x6587),
-      ConvertUTF8ToUnicodeScalarsLenient("\xe4\xbe\x8b\xe6\x96\x87"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x4f8b, 0x6587),
+      "\xe4\xbe\x8b\xe6\x96\x87"));
 
   // U+D55C HANGUL SYLLABLE HAN
   // U+AE00 HANGUL SYLLABLE GEUL
-  EXPECT_EQ(R(conversionOK, 0xd55c, 0xae00),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\x95\x9c\xea\xb8\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xd55c, 0xae00),
+      "\xed\x95\x9c\xea\xb8\x80"));
 
   // U+1112 HANGUL CHOSEONG HIEUH
   // U+1161 HANGUL JUNGSEONG A
@@ -132,98 +208,122 @@ TEST(ConvertUTFTest, UTF8ToUTF32Lenient)
   // U+1100 HANGUL CHOSEONG KIYEOK
   // U+1173 HANGUL JUNGSEONG EU
   // U+11AF HANGUL JONGSEONG RIEUL
-  EXPECT_EQ(R(conversionOK, 0x1112, 0x1161, 0x11ab, 0x1100, 0x1173, 0x11af),
-      ConvertUTF8ToUnicodeScalarsLenient(
-          "\xe1\x84\x92\xe1\x85\xa1\xe1\x86\xab\xe1\x84\x80\xe1\x85\xb3"
-          "\xe1\x86\xaf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK)
+          .withScalars(0x1112, 0x1161, 0x11ab, 0x1100, 0x1173, 0x11af),
+      "\xe1\x84\x92\xe1\x85\xa1\xe1\x86\xab\xe1\x84\x80\xe1\x85\xb3"
+      "\xe1\x86\xaf"));
 
   //
   // 4-byte sequences
   //
 
   // U+E0100 VARIATION SELECTOR-17
-  EXPECT_EQ(R(conversionOK, 0x000E0100),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf3\xa0\x84\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x000E0100),
+      "\xf3\xa0\x84\x80"));
 
   //
   // First possible sequence of a certain length
   //
 
   // U+0000 NULL
-  EXPECT_EQ(R(conversionOK, 0x0000),
-      ConvertUTF8ToUnicodeScalarsLenient(StringRef("\x00", 1)));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x0000),
+      StringRef("\x00", 1)));
 
   // U+0080 PADDING CHARACTER
-  EXPECT_EQ(R(conversionOK, 0x0080),
-      ConvertUTF8ToUnicodeScalarsLenient("\xc2\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x0080),
+      "\xc2\x80"));
 
   // U+0800 SAMARITAN LETTER ALAF
-  EXPECT_EQ(R(conversionOK, 0x0800),
-      ConvertUTF8ToUnicodeScalarsLenient("\xe0\xa0\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x0800),
+      "\xe0\xa0\x80"));
 
   // U+10000 LINEAR B SYLLABLE B008 A
-  EXPECT_EQ(R(conversionOK, 0x10000),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\x90\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x10000),
+      "\xf0\x90\x80\x80"));
 
   // U+200000 (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8\x88\x80\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xf8\x88\x80\x80\x80"));
 
   // U+4000000 (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\x84\x80\x80\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfc\x84\x80\x80\x80\x80"));
 
   //
   // Last possible sequence of a certain length
   //
 
   // U+007F DELETE
-  EXPECT_EQ(R(conversionOK, 0x007f),
-      ConvertUTF8ToUnicodeScalarsLenient("\x7f"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x007f), "\x7f"));
 
   // U+07FF (unassigned)
-  EXPECT_EQ(R(conversionOK, 0x07ff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xdf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x07ff),
+      "\xdf\xbf"));
 
   // U+FFFF (noncharacter)
-  EXPECT_EQ(R(conversionOK, 0xffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xffff),
+      "\xef\xbf\xbf"));
 
   // U+1FFFFF (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf7\xbf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xf7\xbf\xbf\xbf"));
 
   // U+3FFFFFF (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfb\xbf\xbf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfb\xbf\xbf\xbf\xbf"));
 
   // U+7FFFFFFF (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfd\xbf\xbf\xbf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfd\xbf\xbf\xbf\xbf\xbf"));
 
   //
   // Other boundary conditions
   //
 
   // U+D7FF (unassigned)
-  EXPECT_EQ(R(conversionOK, 0xd7ff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\x9f\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xd7ff),
+      "\xed\x9f\xbf"));
 
   // U+E000 (private use)
-  EXPECT_EQ(R(conversionOK, 0xe000),
-      ConvertUTF8ToUnicodeScalarsLenient("\xee\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xe000),
+      "\xee\x80\x80"));
 
   // U+FFFD REPLACEMENT CHARACTER
-  EXPECT_EQ(R(conversionOK, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xbf\xbd"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfffd),
+      "\xef\xbf\xbd"));
 
   // U+10FFFF (noncharacter)
-  EXPECT_EQ(R(conversionOK, 0x10ffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf4\x8f\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x10ffff),
+      "\xf4\x8f\xbf\xbf"));
 
   // U+110000 (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf4\x90\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xf4\x90\x80\x80"));
 
   //
   // Unexpected continuation bytes
@@ -232,407 +332,570 @@ TEST(ConvertUTFTest, UTF8ToUTF32Lenient)
   // A sequence of unexpected continuation bytes that don't follow a first
   // byte, every byte is a maximal subpart.
 
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\x80\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xbf\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\x80\xbf\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\x80\xbf\x80\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\x80\xbf\x82\xbf\xaa"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xaa\xb0\xbb\xbf\xaa\xa0"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
-              0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xaa\xb0\xbb\xbf\xaa\xa0\x8f"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\x80\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xbf\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\x80\xbf\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\x80\xbf\x80\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\x80\xbf\x82\xbf\xaa"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xaa\xb0\xbb\xbf\xaa\xa0"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xaa\xb0\xbb\xbf\xaa\xa0\x8f"));
 
   // All continuation bytes (0x80--0xbf).
-  EXPECT_EQ(R(sourceIllegal,
-              0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
-              0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
-              0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
-              0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
-              0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
-              0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
-              0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
-              0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient(
-          "\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f"
-          "\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f"
-          "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf"
-          "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd,
+                       0xfffd, 0xfffd, 0xfffd, 0xfffd)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd,
+                       0xfffd, 0xfffd, 0xfffd, 0xfffd)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd,
+                       0xfffd, 0xfffd, 0xfffd, 0xfffd)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd,
+                       0xfffd, 0xfffd, 0xfffd, 0xfffd)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd,
+                       0xfffd, 0xfffd, 0xfffd, 0xfffd)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd,
+                       0xfffd, 0xfffd, 0xfffd, 0xfffd)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd,
+                       0xfffd, 0xfffd, 0xfffd, 0xfffd)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd,
+                       0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f"
+      "\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f"
+      "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf"
+      "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf"));
 
   //
   // Lonely start bytes
   //
 
   // Start bytes of 2-byte sequences (0xc0--0xdf).
-  EXPECT_EQ(R(sourceIllegal,
-              0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
-              0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
-              0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
-              0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient(
-          "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf"
-          "\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf"));
-
-  EXPECT_EQ(R(sourceIllegal,
-              0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020,
-              0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020,
-              0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020,
-              0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020,
-              0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020,
-              0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020,
-              0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020,
-              0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020),
-      ConvertUTF8ToUnicodeScalarsLenient(
-          "\xc0\x20\xc1\x20\xc2\x20\xc3\x20\xc4\x20\xc5\x20\xc6\x20\xc7\x20"
-          "\xc8\x20\xc9\x20\xca\x20\xcb\x20\xcc\x20\xcd\x20\xce\x20\xcf\x20"
-          "\xd0\x20\xd1\x20\xd2\x20\xd3\x20\xd4\x20\xd5\x20\xd6\x20\xd7\x20"
-          "\xd8\x20\xd9\x20\xda\x20\xdb\x20\xdc\x20\xdd\x20\xde\x20\xdf\x20"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd,
+                       0xfffd, 0xfffd, 0xfffd, 0xfffd)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd,
+                       0xfffd, 0xfffd, 0xfffd, 0xfffd)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd,
+                       0xfffd, 0xfffd, 0xfffd, 0xfffd)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd,
+                       0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf"
+      "\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf"));
+
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020,
+                       0xfffd, 0x0020, 0xfffd, 0x0020)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020,
+                       0xfffd, 0x0020, 0xfffd, 0x0020)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020,
+                       0xfffd, 0x0020, 0xfffd, 0x0020)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020,
+                       0xfffd, 0x0020, 0xfffd, 0x0020)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020,
+                       0xfffd, 0x0020, 0xfffd, 0x0020)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020,
+                       0xfffd, 0x0020, 0xfffd, 0x0020)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020,
+                       0xfffd, 0x0020, 0xfffd, 0x0020)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020,
+                       0xfffd, 0x0020, 0xfffd, 0x0020),
+      "\xc0\x20\xc1\x20\xc2\x20\xc3\x20\xc4\x20\xc5\x20\xc6\x20\xc7\x20"
+      "\xc8\x20\xc9\x20\xca\x20\xcb\x20\xcc\x20\xcd\x20\xce\x20\xcf\x20"
+      "\xd0\x20\xd1\x20\xd2\x20\xd3\x20\xd4\x20\xd5\x20\xd6\x20\xd7\x20"
+      "\xd8\x20\xd9\x20\xda\x20\xdb\x20\xdc\x20\xdd\x20\xde\x20\xdf\x20"));
 
   // Start bytes of 3-byte sequences (0xe0--0xef).
-  EXPECT_EQ(R(sourceIllegal,
-              0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
-              0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient(
-          "\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef"));
-
-  EXPECT_EQ(R(sourceIllegal,
-              0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020,
-              0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020,
-              0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020,
-              0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020),
-      ConvertUTF8ToUnicodeScalarsLenient(
-          "\xe0\x20\xe1\x20\xe2\x20\xe3\x20\xe4\x20\xe5\x20\xe6\x20\xe7\x20"
-          "\xe8\x20\xe9\x20\xea\x20\xeb\x20\xec\x20\xed\x20\xee\x20\xef\x20"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd,
+                       0xfffd, 0xfffd, 0xfffd, 0xfffd)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd,
+                       0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef"));
+
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020,
+                       0xfffd, 0x0020, 0xfffd, 0x0020)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020,
+                       0xfffd, 0x0020, 0xfffd, 0x0020)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020,
+                       0xfffd, 0x0020, 0xfffd, 0x0020)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020,
+                       0xfffd, 0x0020, 0xfffd, 0x0020),
+      "\xe0\x20\xe1\x20\xe2\x20\xe3\x20\xe4\x20\xe5\x20\xe6\x20\xe7\x20"
+      "\xe8\x20\xe9\x20\xea\x20\xeb\x20\xec\x20\xed\x20\xee\x20\xef\x20"));
 
   // Start bytes of 4-byte sequences (0xf0--0xf7).
-  EXPECT_EQ(R(sourceIllegal,
-              0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7"));
-
-  EXPECT_EQ(R(sourceIllegal,
-              0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020,
-              0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020),
-      ConvertUTF8ToUnicodeScalarsLenient(
-          "\xf0\x20\xf1\x20\xf2\x20\xf3\x20\xf4\x20\xf5\x20\xf6\x20\xf7\x20"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd,
+                       0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7"));
+
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020,
+                       0xfffd, 0x0020, 0xfffd, 0x0020)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020,
+                       0xfffd, 0x0020, 0xfffd, 0x0020),
+      "\xf0\x20\xf1\x20\xf2\x20\xf3\x20\xf4\x20\xf5\x20\xf6\x20\xf7\x20"));
 
   // Start bytes of 5-byte sequences (0xf8--0xfb).
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8\xf9\xfa\xfb"));
-
-  EXPECT_EQ(R(sourceIllegal,
-              0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8\x20\xf9\x20\xfa\x20\xfb\x20"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xf8\xf9\xfa\xfb"));
+
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020,
+                       0xfffd, 0x0020, 0xfffd, 0x0020),
+      "\xf8\x20\xf9\x20\xfa\x20\xfb\x20"));
 
   // Start bytes of 6-byte sequences (0xfc--0xfd).
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\xfd"));
-
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0x0020, 0xfffd, 0x0020),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\x20\xfd\x20"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xfc\xfd"));
+
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020),
+      "\xfc\x20\xfd\x20"));
 
   //
   // Other bytes (0xc0--0xc1, 0xfe--0xff).
   //
 
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xc0"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xc1"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfe"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xff"));
-
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xc0\xc1\xfe\xff"));
-
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfe\xfe\xff\xff"));
-
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfe\x80\x80\x80\x80\x80"));
-
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xff\x80\x80\x80\x80\x80"));
-
-  EXPECT_EQ(R(sourceIllegal,
-              0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020, 0xfffd, 0x0020),
-      ConvertUTF8ToUnicodeScalarsLenient("\xc0\x20\xc1\x20\xfe\x20\xff\x20"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xc0"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xc1"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xfe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xff"));
+
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xc0\xc1\xfe\xff"));
+
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfe\xfe\xff\xff"));
+
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfe\x80\x80\x80\x80\x80"));
+
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xff\x80\x80\x80\x80\x80"));
+
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0x0020, 0xfffd, 0x0020,
+                       0xfffd, 0x0020, 0xfffd, 0x0020),
+      "\xc0\x20\xc1\x20\xfe\x20\xff\x20"));
 
   //
   // Sequences with one continuation byte missing
   //
 
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xc2"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xdf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xe0\xa0"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xe0\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xe1\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xec\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\x9f"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xee\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\x90\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\xbf\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf1\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf3\xbf\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf4\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf4\x8f\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xc2"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xdf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xe0\xa0"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xe0\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xe1\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xec\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xed\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xed\x9f"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xee\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xef\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xf0\x90\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xf0\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xf1\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xf3\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xf4\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xf4\x8f\xbf"));
 
   // Overlong sequences with one trailing byte missing.
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xc0"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xc1"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xe0\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xe0\x9f"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\x8f\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8\x80\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\x80\x80\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xc0"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xc1"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xe0\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xe0\x9f"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xf0\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xf0\x8f\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xf8\x80\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfc\x80\x80\x80\x80"));
 
   // Sequences that represent surrogates with one trailing byte missing.
   // High surrogates
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xa0"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xac"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xaf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xed\xa0"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xed\xac"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xed\xaf"));
   // Low surrogates
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xb0"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xb4"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xed\xb0"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xed\xb4"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xed\xbf"));
 
   // Ill-formed 4-byte sequences.
   // 11110zzz 10zzyyyy 10yyyyxx 10xxxxxx
   // U+1100xx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf4\x90\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xf4\x90\x80"));
   // U+13FBxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf4\xbf\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf5\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf6\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf7\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xf4\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xf5\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xf6\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xf7\x80\x80"));
   // U+1FFBxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf7\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xf7\xbf\xbf"));
 
   // Ill-formed 5-byte sequences.
   // 111110uu 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx
   // U+2000xx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8\x88\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8\xbf\xbf\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf9\x80\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfa\x80\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfb\x80\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xf8\x88\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xf8\xbf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xf9\x80\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfa\x80\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfb\x80\x80\x80"));
   // U+3FFFFxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfb\xbf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfb\xbf\xbf\xbf"));
 
   // Ill-formed 6-byte sequences.
   // 1111110u 10uuuuuu 10uzzzzz 10zzzyyyy 10yyyyxx 10xxxxxx
   // U+40000xx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\x84\x80\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\xbf\xbf\xbf\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfd\x80\x80\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfc\x84\x80\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfc\xbf\xbf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfd\x80\x80\x80\x80"));
   // U+7FFFFFxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfd\xbf\xbf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfd\xbf\xbf\xbf\xbf"));
 
   //
   // Sequences with two continuation bytes missing
   //
 
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\x90"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf1\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf3\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf4\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf4\x8f"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xf0\x90"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xf0\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xf1\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xf3\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xf4\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd),
+      "\xf4\x8f"));
 
   // Overlong sequences with two trailing byte missing.
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xe0"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\x8f"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\x80\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xe0"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xf0\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xf0\x8f"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xf8\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfc\x80\x80\x80"));
 
   // Sequences that represent surrogates with two trailing bytes missing.
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xed"));
 
   // Ill-formed 4-byte sequences.
   // 11110zzz 10zzyyyy 10yyyyxx 10xxxxxx
   // U+110yxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf4\x90"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xf4\x90"));
   // U+13Fyxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf4\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf5\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf6\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf7\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xf4\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xf5\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xf6\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xf7\x80"));
   // U+1FFyxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf7\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xf7\xbf"));
 
   // Ill-formed 5-byte sequences.
   // 111110uu 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx
   // U+200yxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8\x88\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8\xbf\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf9\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfa\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfb\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xf8\x88\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xf8\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xf9\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xfa\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xfb\x80\x80"));
   // U+3FFFyxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfb\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xfb\xbf\xbf"));
 
   // Ill-formed 6-byte sequences.
   // 1111110u 10uuuuuu 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx
   // U+4000yxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\x84\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\xbf\xbf\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfd\x80\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfc\x84\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfc\xbf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfd\x80\x80\x80"));
   // U+7FFFFyxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfd\xbf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfd\xbf\xbf\xbf"));
 
   //
   // Sequences with three continuation bytes missing
   //
 
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf1"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf2"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf3"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf4"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xf0"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xf1"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xf2"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xf3"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xf4"));
 
   // Broken overlong sequences.
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xf0"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xf8\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xfc\x80\x80"));
 
   // Ill-formed 4-byte sequences.
   // 11110zzz 10zzyyyy 10yyyyxx 10xxxxxx
   // U+14yyxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf5"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf6"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xf5"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xf6"));
   // U+1Cyyxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf7"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xf7"));
 
   // Ill-formed 5-byte sequences.
   // 111110uu 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx
   // U+20yyxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8\x88"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf9\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfa\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfb\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xf8\x88"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xf8\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xf9\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xfa\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xfb\x80"));
   // U+3FCyyxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfb\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xfb\xbf"));
 
   // Ill-formed 6-byte sequences.
   // 1111110u 10uuuuuu 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx
   // U+400yyxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\x84\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\xbf\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfd\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xfc\x84\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xfc\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xfd\x80\x80"));
   // U+7FFCyyxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfd\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xfd\xbf\xbf"));
 
   //
   // Sequences with four continuation bytes missing
@@ -641,36 +904,41 @@ TEST(ConvertUTFTest, UTF8ToUTF32Lenient)
   // Ill-formed 5-byte sequences.
   // 111110uu 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx
   // U+uzyyxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf9"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfa"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfb"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xf8"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xf9"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xfa"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xfb"));
   // U+3zyyxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfb"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xfb"));
 
   // Broken overlong sequences.
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xf8"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xfc\x80"));
 
   // Ill-formed 6-byte sequences.
   // 1111110u 10uuuuuu 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx
   // U+uzzyyxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\x84"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfd\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xfc\x84"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xfc\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xfd\x80"));
   // U+7Fzzyyxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfd\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xfd\xbf"));
 
   //
   // Sequences with five continuation bytes missing
@@ -679,89 +947,124 @@ TEST(ConvertUTFTest, UTF8ToUTF32Lenient)
   // Ill-formed 6-byte sequences.
   // 1111110u 10uuuuuu 10zzzzzz 10zzyyyy 10yyyyxx 10xxxxxx
   // U+uzzyyxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xfc"));
   // U+uuzzyyxx (invalid)
-  EXPECT_EQ(R(sourceIllegal, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfd"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd), "\xfd"));
 
   //
   // Consecutive sequences with trailing bytes missing
   //
 
-  EXPECT_EQ(R(sourceIllegal,
-      0xfffd, /**/ 0xfffd, 0xfffd, /**/ 0xfffd, 0xfffd, 0xfffd, /**/
-      0xfffd, 0xfffd, 0xfffd, 0xfffd,
-      0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd,
-      0xfffd, /**/ 0xfffd, /**/ 0xfffd, 0xfffd, 0xfffd, /**/
-      0xfffd, 0xfffd, 0xfffd, 0xfffd,
-      0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient(
-          "\xc0" "\xe0\x80" "\xf0\x80\x80"
-          "\xf8\x80\x80\x80"
-          "\xfc\x80\x80\x80\x80"
-          "\xdf" "\xef\xbf" "\xf7\xbf\xbf"
-          "\xfb\xbf\xbf\xbf"
-          "\xfd\xbf\xbf\xbf\xbf"));
-
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, /**/ 0xfffd, 0xfffd, /**/ 0xfffd, 0xfffd, 0xfffd)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd)
+          .withScalars(0xfffd, /**/ 0xfffd, /**/ 0xfffd, 0xfffd, 0xfffd)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xc0" "\xe0\x80" "\xf0\x80\x80"
+      "\xf8\x80\x80\x80"
+      "\xfc\x80\x80\x80\x80"
+      "\xdf" "\xef\xbf" "\xf7\xbf\xbf"
+      "\xfb\xbf\xbf\xbf"
+      "\xfd\xbf\xbf\xbf\xbf"));
 
   //
   // Overlong UTF-8 sequences
   //
 
   // U+002F SOLIDUS
-  EXPECT_EQ(R(conversionOK, 0x002f),
-      ConvertUTF8ToUnicodeScalarsLenient("\x2f"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x002f), "\x2f"));
 
   // Overlong sequences of the above.
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xc0\xaf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xe0\x80\xaf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\x80\x80\xaf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8\x80\x80\x80\xaf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\x80\x80\x80\x80\xaf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xc0\xaf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xe0\x80\xaf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xf0\x80\x80\xaf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xf8\x80\x80\x80\xaf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfc\x80\x80\x80\x80\xaf"));
 
   // U+0000 NULL
-  EXPECT_EQ(R(conversionOK, 0x0000),
-      ConvertUTF8ToUnicodeScalarsLenient(StringRef("\x00", 1)));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x0000),
+      StringRef("\x00", 1)));
 
   // Overlong sequences of the above.
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xc0\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xe0\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\x80\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8\x80\x80\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\x80\x80\x80\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xc0\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xe0\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xf0\x80\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xf8\x80\x80\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfc\x80\x80\x80\x80\x80"));
 
   // Other overlong sequences.
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xc0\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xc1\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xc1\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xe0\x9f\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xa0\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xbf\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\x8f\x80\x80"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\x8f\xbf\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf8\x87\xbf\xbf\xbf"));
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xfc\x83\xbf\xbf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xc0\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xc1\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal).withScalars(0xfffd, 0xfffd),
+      "\xc1\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xe0\x9f\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xed\xa0\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xed\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xf0\x8f\x80\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xf0\x8f\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xf8\x87\xbf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xfc\x83\xbf\xbf\xbf\xbf"));
 
   //
   // Isolated surrogates
@@ -780,68 +1083,98 @@ TEST(ConvertUTFTest, UTF8ToUTF32Lenient)
   // High surrogates
 
   // U+D800
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xa0\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xed\xa0\x80"));
 
   // U+DB40
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xac\xa0"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xed\xac\xa0"));
 
   // U+DBFF
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xaf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xed\xaf\xbf"));
 
   // Low surrogates
 
   // U+DC00
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xb0\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xed\xb0\x80"));
 
   // U+DD00
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xb4\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xed\xb4\x80"));
 
   // U+DFFF
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd),
+      "\xed\xbf\xbf"));
 
   // Surrogate pairs
 
   // U+D800 U+DC00
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xa0\x80\xed\xb0\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xed\xa0\x80\xed\xb0\x80"));
 
   // U+D800 U+DD00
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xa0\x80\xed\xb4\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xed\xa0\x80\xed\xb4\x80"));
 
   // U+D800 U+DFFF
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xa0\x80\xed\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xed\xa0\x80\xed\xbf\xbf"));
 
   // U+DB40 U+DC00
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xac\xa0\xed\xb0\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xed\xac\xa0\xed\xb0\x80"));
 
   // U+DB40 U+DD00
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xac\xa0\xed\xb4\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xed\xac\xa0\xed\xb4\x80"));
 
   // U+DB40 U+DFFF
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xac\xa0\xed\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xed\xac\xa0\xed\xbf\xbf"));
 
   // U+DBFF U+DC00
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xaf\xbf\xed\xb0\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xed\xaf\xbf\xed\xb0\x80"));
 
   // U+DBFF U+DD00
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xaf\xbf\xed\xb4\x80"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xed\xaf\xbf\xed\xb4\x80"));
 
   // U+DBFF U+DFFF
-  EXPECT_EQ(R(sourceIllegal, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xed\xaf\xbf\xed\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceIllegal)
+          .withScalars(0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd, 0xfffd),
+      "\xed\xaf\xbf\xed\xbf\xbf"));
 
   //
   // Noncharacters
@@ -855,397 +1188,477 @@ TEST(ConvertUTFTest, UTF8ToUTF32Lenient)
   //    and the values U+FDD0..U+FDEF.
 
   // U+FFFE
-  EXPECT_EQ(R(conversionOK, 0xfffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfffe),
+      "\xef\xbf\xbe"));
 
   // U+FFFF
-  EXPECT_EQ(R(conversionOK, 0xffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xffff),
+      "\xef\xbf\xbf"));
 
   // U+1FFFE
-  EXPECT_EQ(R(conversionOK, 0x1fffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\x9f\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x1fffe),
+      "\xf0\x9f\xbf\xbe"));
 
   // U+1FFFF
-  EXPECT_EQ(R(conversionOK, 0x1ffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\x9f\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x1ffff),
+      "\xf0\x9f\xbf\xbf"));
 
   // U+2FFFE
-  EXPECT_EQ(R(conversionOK, 0x2fffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\xaf\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x2fffe),
+      "\xf0\xaf\xbf\xbe"));
 
   // U+2FFFF
-  EXPECT_EQ(R(conversionOK, 0x2ffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\xaf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x2ffff),
+      "\xf0\xaf\xbf\xbf"));
 
   // U+3FFFE
-  EXPECT_EQ(R(conversionOK, 0x3fffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\xbf\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x3fffe),
+      "\xf0\xbf\xbf\xbe"));
 
   // U+3FFFF
-  EXPECT_EQ(R(conversionOK, 0x3ffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf0\xbf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x3ffff),
+      "\xf0\xbf\xbf\xbf"));
 
   // U+4FFFE
-  EXPECT_EQ(R(conversionOK, 0x4fffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf1\x8f\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x4fffe),
+      "\xf1\x8f\xbf\xbe"));
 
   // U+4FFFF
-  EXPECT_EQ(R(conversionOK, 0x4ffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf1\x8f\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x4ffff),
+      "\xf1\x8f\xbf\xbf"));
 
   // U+5FFFE
-  EXPECT_EQ(R(conversionOK, 0x5fffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf1\x9f\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x5fffe),
+      "\xf1\x9f\xbf\xbe"));
 
   // U+5FFFF
-  EXPECT_EQ(R(conversionOK, 0x5ffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf1\x9f\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x5ffff),
+      "\xf1\x9f\xbf\xbf"));
 
   // U+6FFFE
-  EXPECT_EQ(R(conversionOK, 0x6fffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf1\xaf\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x6fffe),
+      "\xf1\xaf\xbf\xbe"));
 
   // U+6FFFF
-  EXPECT_EQ(R(conversionOK, 0x6ffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf1\xaf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x6ffff),
+      "\xf1\xaf\xbf\xbf"));
 
   // U+7FFFE
-  EXPECT_EQ(R(conversionOK, 0x7fffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf1\xbf\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x7fffe),
+      "\xf1\xbf\xbf\xbe"));
 
   // U+7FFFF
-  EXPECT_EQ(R(conversionOK, 0x7ffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf1\xbf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x7ffff),
+      "\xf1\xbf\xbf\xbf"));
 
   // U+8FFFE
-  EXPECT_EQ(R(conversionOK, 0x8fffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf2\x8f\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x8fffe),
+      "\xf2\x8f\xbf\xbe"));
 
   // U+8FFFF
-  EXPECT_EQ(R(conversionOK, 0x8ffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf2\x8f\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x8ffff),
+      "\xf2\x8f\xbf\xbf"));
 
   // U+9FFFE
-  EXPECT_EQ(R(conversionOK, 0x9fffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf2\x9f\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x9fffe),
+      "\xf2\x9f\xbf\xbe"));
 
   // U+9FFFF
-  EXPECT_EQ(R(conversionOK, 0x9ffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf2\x9f\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x9ffff),
+      "\xf2\x9f\xbf\xbf"));
 
   // U+AFFFE
-  EXPECT_EQ(R(conversionOK, 0xafffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf2\xaf\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xafffe),
+      "\xf2\xaf\xbf\xbe"));
 
   // U+AFFFF
-  EXPECT_EQ(R(conversionOK, 0xaffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf2\xaf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xaffff),
+      "\xf2\xaf\xbf\xbf"));
 
   // U+BFFFE
-  EXPECT_EQ(R(conversionOK, 0xbfffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf2\xbf\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xbfffe),
+      "\xf2\xbf\xbf\xbe"));
 
   // U+BFFFF
-  EXPECT_EQ(R(conversionOK, 0xbffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf2\xbf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xbffff),
+      "\xf2\xbf\xbf\xbf"));
 
   // U+CFFFE
-  EXPECT_EQ(R(conversionOK, 0xcfffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf3\x8f\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xcfffe),
+      "\xf3\x8f\xbf\xbe"));
 
   // U+CFFFF
-  EXPECT_EQ(R(conversionOK, 0xcfffF),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf3\x8f\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xcfffF),
+      "\xf3\x8f\xbf\xbf"));
 
   // U+DFFFE
-  EXPECT_EQ(R(conversionOK, 0xdfffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf3\x9f\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xdfffe),
+      "\xf3\x9f\xbf\xbe"));
 
   // U+DFFFF
-  EXPECT_EQ(R(conversionOK, 0xdffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf3\x9f\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xdffff),
+      "\xf3\x9f\xbf\xbf"));
 
   // U+EFFFE
-  EXPECT_EQ(R(conversionOK, 0xefffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf3\xaf\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xefffe),
+      "\xf3\xaf\xbf\xbe"));
 
   // U+EFFFF
-  EXPECT_EQ(R(conversionOK, 0xeffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf3\xaf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xeffff),
+      "\xf3\xaf\xbf\xbf"));
 
   // U+FFFFE
-  EXPECT_EQ(R(conversionOK, 0xffffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf3\xbf\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xffffe),
+      "\xf3\xbf\xbf\xbe"));
 
   // U+FFFFF
-  EXPECT_EQ(R(conversionOK, 0xfffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf3\xbf\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfffff),
+      "\xf3\xbf\xbf\xbf"));
 
   // U+10FFFE
-  EXPECT_EQ(R(conversionOK, 0x10fffe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf4\x8f\xbf\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x10fffe),
+      "\xf4\x8f\xbf\xbe"));
 
   // U+10FFFF
-  EXPECT_EQ(R(conversionOK, 0x10ffff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xf4\x8f\xbf\xbf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x10ffff),
+      "\xf4\x8f\xbf\xbf"));
 
   // U+FDD0
-  EXPECT_EQ(R(conversionOK, 0xfdd0),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\x90"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdd0),
+      "\xef\xb7\x90"));
 
   // U+FDD1
-  EXPECT_EQ(R(conversionOK, 0xfdd1),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\x91"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdd1),
+      "\xef\xb7\x91"));
 
   // U+FDD2
-  EXPECT_EQ(R(conversionOK, 0xfdd2),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\x92"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdd2),
+      "\xef\xb7\x92"));
 
   // U+FDD3
-  EXPECT_EQ(R(conversionOK, 0xfdd3),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\x93"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdd3),
+      "\xef\xb7\x93"));
 
   // U+FDD4
-  EXPECT_EQ(R(conversionOK, 0xfdd4),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\x94"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdd4),
+      "\xef\xb7\x94"));
 
   // U+FDD5
-  EXPECT_EQ(R(conversionOK, 0xfdd5),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\x95"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdd5),
+      "\xef\xb7\x95"));
 
   // U+FDD6
-  EXPECT_EQ(R(conversionOK, 0xfdd6),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\x96"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdd6),
+      "\xef\xb7\x96"));
 
   // U+FDD7
-  EXPECT_EQ(R(conversionOK, 0xfdd7),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\x97"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdd7),
+      "\xef\xb7\x97"));
 
   // U+FDD8
-  EXPECT_EQ(R(conversionOK, 0xfdd8),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\x98"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdd8),
+      "\xef\xb7\x98"));
 
   // U+FDD9
-  EXPECT_EQ(R(conversionOK, 0xfdd9),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\x99"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdd9),
+      "\xef\xb7\x99"));
 
   // U+FDDA
-  EXPECT_EQ(R(conversionOK, 0xfdda),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\x9a"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdda),
+      "\xef\xb7\x9a"));
 
   // U+FDDB
-  EXPECT_EQ(R(conversionOK, 0xfddb),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\x9b"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfddb),
+      "\xef\xb7\x9b"));
 
   // U+FDDC
-  EXPECT_EQ(R(conversionOK, 0xfddc),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\x9c"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfddc),
+      "\xef\xb7\x9c"));
 
   // U+FDDD
-  EXPECT_EQ(R(conversionOK, 0xfddd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\x9d"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfddd),
+      "\xef\xb7\x9d"));
 
   // U+FDDE
-  EXPECT_EQ(R(conversionOK, 0xfdde),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\x9e"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdde),
+      "\xef\xb7\x9e"));
 
   // U+FDDF
-  EXPECT_EQ(R(conversionOK, 0xfddf),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\x9f"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfddf),
+      "\xef\xb7\x9f"));
 
   // U+FDE0
-  EXPECT_EQ(R(conversionOK, 0xfde0),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xa0"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfde0),
+      "\xef\xb7\xa0"));
 
   // U+FDE1
-  EXPECT_EQ(R(conversionOK, 0xfde1),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xa1"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfde1),
+      "\xef\xb7\xa1"));
 
   // U+FDE2
-  EXPECT_EQ(R(conversionOK, 0xfde2),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xa2"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfde2),
+      "\xef\xb7\xa2"));
 
   // U+FDE3
-  EXPECT_EQ(R(conversionOK, 0xfde3),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xa3"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfde3),
+      "\xef\xb7\xa3"));
 
   // U+FDE4
-  EXPECT_EQ(R(conversionOK, 0xfde4),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xa4"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfde4),
+      "\xef\xb7\xa4"));
 
   // U+FDE5
-  EXPECT_EQ(R(conversionOK, 0xfde5),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xa5"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfde5),
+      "\xef\xb7\xa5"));
 
   // U+FDE6
-  EXPECT_EQ(R(conversionOK, 0xfde6),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xa6"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfde6),
+      "\xef\xb7\xa6"));
 
   // U+FDE7
-  EXPECT_EQ(R(conversionOK, 0xfde7),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xa7"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfde7),
+      "\xef\xb7\xa7"));
 
   // U+FDE8
-  EXPECT_EQ(R(conversionOK, 0xfde8),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xa8"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfde8),
+      "\xef\xb7\xa8"));
 
   // U+FDE9
-  EXPECT_EQ(R(conversionOK, 0xfde9),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xa9"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfde9),
+      "\xef\xb7\xa9"));
 
   // U+FDEA
-  EXPECT_EQ(R(conversionOK, 0xfdea),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xaa"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdea),
+      "\xef\xb7\xaa"));
 
   // U+FDEB
-  EXPECT_EQ(R(conversionOK, 0xfdeb),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xab"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdeb),
+      "\xef\xb7\xab"));
 
   // U+FDEC
-  EXPECT_EQ(R(conversionOK, 0xfdec),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xac"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdec),
+      "\xef\xb7\xac"));
 
   // U+FDED
-  EXPECT_EQ(R(conversionOK, 0xfded),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xad"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfded),
+      "\xef\xb7\xad"));
 
   // U+FDEE
-  EXPECT_EQ(R(conversionOK, 0xfdee),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xae"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdee),
+      "\xef\xb7\xae"));
 
   // U+FDEF
-  EXPECT_EQ(R(conversionOK, 0xfdef),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xaf"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdef),
+      "\xef\xb7\xaf"));
 
   // U+FDF0
-  EXPECT_EQ(R(conversionOK, 0xfdf0),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xb0"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdf0),
+      "\xef\xb7\xb0"));
 
   // U+FDF1
-  EXPECT_EQ(R(conversionOK, 0xfdf1),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xb1"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdf1),
+      "\xef\xb7\xb1"));
 
   // U+FDF2
-  EXPECT_EQ(R(conversionOK, 0xfdf2),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xb2"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdf2),
+      "\xef\xb7\xb2"));
 
   // U+FDF3
-  EXPECT_EQ(R(conversionOK, 0xfdf3),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xb3"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdf3),
+      "\xef\xb7\xb3"));
 
   // U+FDF4
-  EXPECT_EQ(R(conversionOK, 0xfdf4),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xb4"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdf4),
+      "\xef\xb7\xb4"));
 
   // U+FDF5
-  EXPECT_EQ(R(conversionOK, 0xfdf5),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xb5"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdf5),
+      "\xef\xb7\xb5"));
 
   // U+FDF6
-  EXPECT_EQ(R(conversionOK, 0xfdf6),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xb6"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdf6),
+      "\xef\xb7\xb6"));
 
   // U+FDF7
-  EXPECT_EQ(R(conversionOK, 0xfdf7),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xb7"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdf7),
+      "\xef\xb7\xb7"));
 
   // U+FDF8
-  EXPECT_EQ(R(conversionOK, 0xfdf8),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xb8"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdf8),
+      "\xef\xb7\xb8"));
 
   // U+FDF9
-  EXPECT_EQ(R(conversionOK, 0xfdf9),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xb9"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdf9),
+      "\xef\xb7\xb9"));
 
   // U+FDFA
-  EXPECT_EQ(R(conversionOK, 0xfdfa),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xba"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdfa),
+      "\xef\xb7\xba"));
 
   // U+FDFB
-  EXPECT_EQ(R(conversionOK, 0xfdfb),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xbb"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdfb),
+      "\xef\xb7\xbb"));
 
   // U+FDFC
-  EXPECT_EQ(R(conversionOK, 0xfdfc),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xbc"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdfc),
+      "\xef\xb7\xbc"));
 
   // U+FDFD
-  EXPECT_EQ(R(conversionOK, 0xfdfd),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xbd"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdfd),
+      "\xef\xb7\xbd"));
 
   // U+FDFE
-  EXPECT_EQ(R(conversionOK, 0xfdfe),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xbe"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdfe),
+      "\xef\xb7\xbe"));
 
   // U+FDFF
-  EXPECT_EQ(R(conversionOK, 0xfdff),
-      ConvertUTF8ToUnicodeScalarsLenient("\xef\xb7\xbf"));
-}
-
-std::pair<ConversionResult, std::vector<unsigned>>
-ConvertUTF8ToUnicodeScalarsPartialLenient(StringRef S) {
-  const UTF8 *SourceStart = reinterpret_cast<const UTF8 *>(S.data());
-
-  const UTF8 *SourceNext = SourceStart;
-  std::vector<UTF32> Decoded(S.size(), 0);
-  UTF32 *TargetStart = Decoded.data();
-
-  auto Result = ConvertUTF8toUTF32Partial(
-      &SourceNext, SourceStart + S.size(), &TargetStart,
-      Decoded.data() + Decoded.size(), lenientConversion);
-
-  Decoded.resize(TargetStart - Decoded.data());
-
-  return std::make_pair(Result, Decoded);
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0xfdff),
+      "\xef\xb7\xbf"));
 }
 
 TEST(ConvertUTFTest, UTF8ToUTF32PartialLenient) {
   // U+0041 LATIN CAPITAL LETTER A
-  EXPECT_EQ(R(conversionOK, 0x0041),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\x41"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(conversionOK).withScalars(0x0041),
+      "\x41", true));
 
   //
   // Sequences with one continuation byte missing
   //
 
-  EXPECT_EQ(R0(sourceExhausted),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\xc2"));
-  EXPECT_EQ(R0(sourceExhausted),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\xdf"));
-  EXPECT_EQ(R0(sourceExhausted),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\xe0\xa0"));
-  EXPECT_EQ(R0(sourceExhausted),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\xe0\xbf"));
-  EXPECT_EQ(R0(sourceExhausted),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\xe1\x80"));
-  EXPECT_EQ(R0(sourceExhausted),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\xec\xbf"));
-  EXPECT_EQ(R0(sourceExhausted),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\xed\x80"));
-  EXPECT_EQ(R0(sourceExhausted),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\xed\x9f"));
-  EXPECT_EQ(R0(sourceExhausted),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\xee\x80"));
-  EXPECT_EQ(R0(sourceExhausted),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\xef\xbf"));
-  EXPECT_EQ(R0(sourceExhausted),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\xf0\x90\x80"));
-  EXPECT_EQ(R0(sourceExhausted),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\xf0\xbf\xbf"));
-  EXPECT_EQ(R0(sourceExhausted),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\xf1\x80\x80"));
-  EXPECT_EQ(R0(sourceExhausted),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\xf3\xbf\xbf"));
-  EXPECT_EQ(R0(sourceExhausted),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\xf4\x80\x80"));
-  EXPECT_EQ(R0(sourceExhausted),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\xf4\x8f\xbf"));
-
-  EXPECT_EQ(R(sourceExhausted, 0x0041),
-      ConvertUTF8ToUnicodeScalarsPartialLenient("\x41\xc2"));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted),
+      "\xc2", true));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted),
+      "\xdf", true));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted),
+      "\xe0\xa0", true));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted),
+      "\xe0\xbf", true));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted),
+      "\xe1\x80", true));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted),
+      "\xec\xbf", true));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted),
+      "\xed\x80", true));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted),
+      "\xed\x9f", true));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted),
+      "\xee\x80", true));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted),
+      "\xef\xbf", true));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted),
+      "\xf0\x90\x80", true));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted),
+      "\xf0\xbf\xbf", true));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted),
+      "\xf1\x80\x80", true));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted),
+      "\xf3\xbf\xbf", true));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted),
+      "\xf4\x80\x80", true));
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted),
+      "\xf4\x8f\xbf", true));
+
+  EXPECT_TRUE(CheckConvertUTF8ToUnicodeScalars(
+      ConvertUTFResultContainer(sourceExhausted).withScalars(0x0041),
+      "\x41\xc2", true));
 }
 
-#undef R0
-#undef R
-





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