[PATCH] D42063: [clangd] Avoid combinatorial explosion in CodeCompleteTests.

[Sam McCall via Phabricator via cfe-commits]

sammccall created this revision.
sammccall added a reviewer: ilya-biryukov.
Herald added subscribers: cfe-commits, klimek.

This test dominates our unit test runtime, and the change speeds it up by 10x.
We lose coverage of some combinations of flags, but I'm not sure that's finding
many bugs.

3300 -> 300ms on my machine (3800 -> 800ms for the whole of CompletionTest).


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D42063

Files:
  unittests/clangd/CodeCompleteTests.cpp


Index: unittests/clangd/CodeCompleteTests.cpp
===================================================================
--- unittests/clangd/CodeCompleteTests.cpp
+++ unittests/clangd/CodeCompleteTests.cpp
@@ -254,26 +254,26 @@
 }
 
 TEST(CompletionTest, CompletionOptions) {
-  clangd::CodeCompleteOptions Opts;
-  for (bool IncludeMacros : {true, false}) {
-    Opts.IncludeMacros = IncludeMacros;
-    for (bool IncludeGlobals : {true, false}) {
-      Opts.IncludeGlobals = IncludeGlobals;
-      for (bool IncludeBriefComments : {true, false}) {
-        Opts.IncludeBriefComments = IncludeBriefComments;
-        for (bool EnableSnippets : {true, false}) {
-          Opts.EnableSnippets = EnableSnippets;
-          for (bool IncludeCodePatterns : {true, false}) {
-            Opts.IncludeCodePatterns = IncludeCodePatterns;
-            for (bool IncludeIneligibleResults : {true, false}) {
-              Opts.IncludeIneligibleResults = IncludeIneligibleResults;
-              TestAfterDotCompletion(Opts);
-              TestGlobalScopeCompletion(Opts);
-            }
-          }
-        }
-      }
-    }
+  auto Test = [&](const clangd::CodeCompleteOptions &Opts) {
+    TestAfterDotCompletion(Opts);
+    TestGlobalScopeCompletion(Opts);
+  };
+  // We used to test every combination of options, but that got too slow (2^N).
+  auto Flags = {
+    &clangd::CodeCompleteOptions::IncludeMacros,
+    &clangd::CodeCompleteOptions::IncludeGlobals,
+    &clangd::CodeCompleteOptions::IncludeBriefComments,
+    &clangd::CodeCompleteOptions::EnableSnippets,
+    &clangd::CodeCompleteOptions::IncludeCodePatterns,
+    &clangd::CodeCompleteOptions::IncludeIneligibleResults,
+  };
+  // Test default options.
+  Test({});
+  // Test one flag set.
+  for (auto &F : Flags) {
+    clangd::CodeCompleteOptions O;
+    O.*F = true;
+    Test(O);
   }
 }
 


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