Googletest export

Ensure `.what()` is printed in `ThrowsMessage(...)` to address https://github.com/google/googletest/issues/3582

Closes #3582

PiperOrigin-RevId: 399462851

googlemock/include/gmock/gmock-matchers.h

@@ -5266,7 +5266,8 @@ class WithWhatMatcherImpl {
 
   template <typename Err>
   bool MatchAndExplain(const Err& err, MatchResultListener* listener) const {
-    *listener << "which contains .what() that ";
+    *listener << "which contains .what() (of value = " << err.what()
+              << ") that ";
     return matcher_.MatchAndExplain(err.what(), listener);
   }
 

googlemock/test/gmock-matchers_test.cc

@@ -8515,6 +8515,12 @@ TEST(ThrowsTest, Examples) {
       ThrowsMessage<std::runtime_error>(HasSubstr("message")));
 }
 
+TEST(ThrowsTest, PrintsExceptionWhat) {
+  EXPECT_THAT(
+      std::function<void()>([]() { throw std::runtime_error("ABC123XYZ"); }),
+      ThrowsMessage<std::runtime_error>(HasSubstr("ABC123XYZ")));
+}
+
 TEST(ThrowsTest, DoesNotGenerateDuplicateCatchClauseWarning) {
   EXPECT_THAT(std::function<void()>([]() { throw std::exception(); }),
               Throws<std::exception>());
@@ -8630,15 +8636,6 @@ TEST_P(ThrowsPredicateTest, FailWrongTypeNonStd) {
               HasSubstr("throws an exception of an unknown type"));
 }
 
-TEST_P(ThrowsPredicateTest, FailWrongMessage) {
-  Matcher<std::function<void()>> matcher = GetParam();
-  StringMatchResultListener listener;
-  EXPECT_FALSE(matcher.MatchAndExplain(
-      []() { throw std::runtime_error("wrong message"); }, &listener));
-  EXPECT_THAT(listener.str(), HasSubstr("std::runtime_error"));
-  EXPECT_THAT(listener.str(), Not(HasSubstr("wrong message")));
-}
-
 TEST_P(ThrowsPredicateTest, FailNoThrow) {
   Matcher<std::function<void()>> matcher = GetParam();
   StringMatchResultListener listener;