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-rw-r--r--test/gmock-matchers_test.cc13
1 files changed, 13 insertions, 0 deletions
diff --git a/test/gmock-matchers_test.cc b/test/gmock-matchers_test.cc
index f5eff5fb..be2e9009 100644
--- a/test/gmock-matchers_test.cc
+++ b/test/gmock-matchers_test.cc
@@ -3071,6 +3071,19 @@ TEST_F(DoubleNearTest, DoubleNearCanDescribeSelf) {
EXPECT_EQ("is anything", DescribeNegation(m3));
}
+TEST_F(DoubleNearTest, ExplainsResultWhenMatchFails) {
+ EXPECT_EQ("", Explain(DoubleNear(2.0, 0.1), 2.05));
+ EXPECT_EQ("which is 0.2 from 2", Explain(DoubleNear(2.0, 0.1), 2.2));
+ EXPECT_EQ("which is -0.3 from 2", Explain(DoubleNear(2.0, 0.1), 1.7));
+
+ const string explanation = Explain(DoubleNear(2.1, 1e-10), 2.1 + 1.2e-10);
+ // Different C++ implementations may print floating-point numbers
+ // slightly differently.
+ EXPECT_TRUE(explanation == "which is 1.2e-10 from 2.1" || // GCC
+ explanation == "which is 1.2e-010 from 2.1") // MSVC
+ << " where explanation is \"" << explanation << "\".";
+}
+
TEST_F(DoubleNearTest, NanSensitiveDoubleNearCanDescribeSelf) {
Matcher<double> m1 = NanSensitiveDoubleNear(2.0, 0.5);
EXPECT_EQ("is approximately 2 (absolute error <= 0.5)", Describe(m1));