[clang-tools-extra] [MLIR][Presburger] Fix reduce bug in Fraction class and add tests (PR #68298)

[Arjun P via cfe-commits]

================
@@ -0,0 +1,51 @@
+#include "mlir/Analysis/Presburger/Fraction.h"
+#include "./Utils.h"
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+using namespace mlir;
+using namespace presburger;
+
+TEST(FractionTest, getAsInteger) {
+  Fraction f(3, 1);
+  EXPECT_EQ(f.getAsInteger(), MPInt(3));
+}
+
+TEST(FractionTest, nearIntegers) {
+  Fraction f(52, 14);
+
+  EXPECT_EQ(floor(f), 3);
+  EXPECT_EQ(ceil(f), 4);
+}
+
+TEST(FractionTest, reduce) {
+  Fraction f(20, 35), g(-56, 63);
+  EXPECT_EQ(f, Fraction(4, 7));
+  EXPECT_EQ(g, Fraction(-8, 9));
+}
+
+TEST(FractionTest, arithmetic) {
+  Fraction f(3, 4), g(-2, 3);
+
+  EXPECT_EQ(f / g, Fraction(-9, 8));
+  EXPECT_EQ(f * g, Fraction(-1, 2));
+  EXPECT_EQ(f + g, Fraction(1, 12));
+  EXPECT_EQ(f - g, Fraction(17, 12));
+
+  f /= g;
+  EXPECT_EQ(f, Fraction(-9, 8));
+  f *= g;
+  EXPECT_EQ(f, Fraction(3, 4));
+  f += g;
+  EXPECT_EQ(f, Fraction(Fraction(1, 12)));
+  f -= g;
+  EXPECT_EQ(f, Fraction(3, 4));
+}
+
+TEST(FractionTest, relational) {
+  Fraction f(2, 5), g(3, 7);
+  ASSERT_TRUE(f < g);
+  ASSERT_FALSE(g < f);
----------------
Superty wrote:

You can use EXPECT_TRUE/EXPECT_FALSE here

https://github.com/llvm/llvm-project/pull/68298