Do not emit stack traces for messages generated by GTEST_SKIP()

Stack traces in assertion failures are an extremely useful tool for
developers tasked with investigating failing tests. It's difficult to
understate this. In contrast to ordinary test assertions (e.g.,
ASSERT_TRUE or EXPECT_FALSE), GTEST_SKIP is a developer-authored
directive to skip one or more tests. Stack traces emitted in skip
messages do not give the developer useful information, as the skip
message itself contains the code location where GTEST_SKIP was used. In
addition to being noise in the output, symbolization of stack traces is
not free. In some Chromium configurations, symbolization in a skipped
test can incur a cost in excess of 25 seconds for a test that otherwise
takes 0-1ms; see https://crbug.com/1517343#c9.

In this CL, we suppress generation and emission of stack traces for
kSkip messages to reduce the output noise and overhead of GTEST_SKIP().

PiperOrigin-RevId: 598899010
Change-Id: I46926fed452c8d7edcb3d636d8fed42cb6c0a9e9

googletest/src/gtest.cc

@@ -459,7 +459,12 @@ void AssertHelper::operator=(const Message& message) const {
   UnitTest::GetInstance()->AddTestPartResult(
       data_->type, data_->file, data_->line,
       AppendUserMessage(data_->message, message),
-      UnitTest::GetInstance()->impl()->CurrentOsStackTraceExceptTop(1)
+      // Suppress emission of the stack trace for GTEST_SKIP() since skipping is
+      // an intentional act by the developer rather than a failure requiring
+      // investigation.
+      data_->type != TestPartResult::kSkip
+          ? UnitTest::GetInstance()->impl()->CurrentOsStackTraceExceptTop(1)
+          : ""
       // Skips the stack frame for this function itself.
   );  // NOLINT
 }

googletest/test/googletest-output-test-golden-lin.txt

@@ -970,7 +970,6 @@ googletest-output-test_.cc:#: Skipped
 [----------] 1 test from TestSuiteThatSkipsInSetUp
 googletest-output-test_.cc:#: Skipped
 Skip entire test suite
-Stack trace: (omitted)
 
 [ RUN      ] TestSuiteThatSkipsInSetUp.ShouldNotRun
 googletest-output-test_.cc:#: Skipped

googletest/test/gtest_xml_output_unittest.py

@@ -112,20 +112,23 @@ Invalid characters in brackets []%(stack)s]]></failure>
   </testsuite>
   <testsuite name="SkippedTest" tests="3" failures="1" disabled="0" skipped="2" errors="0" time="*" timestamp="*">
     <testcase name="Skipped" status="run" file="gtest_xml_output_unittest_.cc" line="75" result="skipped" time="*" timestamp="*" classname="SkippedTest">
-      <skipped message="gtest_xml_output_unittest_.cc:*&#x0A;%(stack_entity)s"><![CDATA[gtest_xml_output_unittest_.cc:*
+      <skipped message="gtest_xml_output_unittest_.cc:*&#x0A;&#x0A;"><![CDATA[gtest_xml_output_unittest_.cc:*
-%(stack)s]]></skipped>
+
+]]></skipped>
     </testcase>
     <testcase name="SkippedWithMessage" file="gtest_xml_output_unittest_.cc" line="79" status="run" result="skipped" time="*" timestamp="*" classname="SkippedTest">
-      <skipped message="gtest_xml_output_unittest_.cc:*&#x0A;It is good practice to tell why you skip a test.%(stack_entity)s"><![CDATA[gtest_xml_output_unittest_.cc:*
+      <skipped message="gtest_xml_output_unittest_.cc:*&#x0A;It is good practice to tell why you skip a test.&#x0A;"><![CDATA[gtest_xml_output_unittest_.cc:*
-It is good practice to tell why you skip a test.%(stack)s]]></skipped>
+It is good practice to tell why you skip a test.
+]]></skipped>
     </testcase>
     <testcase name="SkippedAfterFailure" file="gtest_xml_output_unittest_.cc" line="83" status="run" result="completed" time="*" timestamp="*" classname="SkippedTest">
       <failure message="gtest_xml_output_unittest_.cc:*&#x0A;Expected equality of these values:&#x0A;  1&#x0A;  2%(stack_entity)s" type=""><![CDATA[gtest_xml_output_unittest_.cc:*
 Expected equality of these values:
   1
   2%(stack)s]]></failure>
-      <skipped message="gtest_xml_output_unittest_.cc:*&#x0A;It is good practice to tell why you skip a test.%(stack_entity)s"><![CDATA[gtest_xml_output_unittest_.cc:*
+      <skipped message="gtest_xml_output_unittest_.cc:*&#x0A;It is good practice to tell why you skip a test.&#x0A;"><![CDATA[gtest_xml_output_unittest_.cc:*
-It is good practice to tell why you skip a test.%(stack)s]]></skipped>
+It is good practice to tell why you skip a test.
+]]></skipped>
     </testcase>
 
   </testsuite>