[googletest] Output skip message

Closes #2208

Previously, skip messages were invisible, so debugging skips was hard.

Now we have this:

```
$ ./googletest/gtest_skip_test
Running main() from /home/lesha/github/snarkmaster/googletest/googletest/src/gtest_main.cc
[==========] Running 3 tests from 2 test suites.
[----------] Global test environment set-up.
[----------] 1 test from SkipTest
[ RUN      ] SkipTest.DoesSkip
/home/lesha/github/snarkmaster/googletest/googletest/test/gtest_skip_test.cc:38: Skipped
skipping single test
[  SKIPPED ] SkipTest.DoesSkip (0 ms)
[----------] 1 test from SkipTest (1 ms total)
...
```

googletest/CMakeLists.txt

@@ -266,6 +266,7 @@ $env:Path = \"$project_bin;$env:Path\"
   cxx_executable(googletest-break-on-failure-unittest_ test gtest)
   py_test(googletest-break-on-failure-unittest)
 
+  py_test(gtest_skip_check_output_test)
   py_test(gtest_skip_environment_check_output_test)
 
   # Visual Studio .NET 2003 does not support STL with exceptions disabled.

googletest/include/gtest/gtest.h

@@ -1889,7 +1889,7 @@ class TestWithParam : public Test, public WithParamInterface<T> {
 // Skips test in runtime.
 // Skipping test aborts current function.
 // Skipped tests are neither successful nor failed.
-#define GTEST_SKIP() GTEST_SKIP_("Skipped")
+#define GTEST_SKIP() GTEST_SKIP_("")
 
 // ADD_FAILURE unconditionally adds a failure to the current test.
 // SUCCEED generates a success - it doesn't automatically make the

googletest/src/gtest.cc

@@ -3220,9 +3220,7 @@ void PrettyUnitTestResultPrinter::OnTestStart(const TestInfo& test_info) {
 void PrettyUnitTestResultPrinter::OnTestPartResult(
     const TestPartResult& result) {
   switch (result.type()) {
-    // If the test part succeeded, or was skipped,
+    // If the test part succeeded, we don't need to do anything.
-    // we don't need to do anything.
-    case TestPartResult::kSkip:
     case TestPartResult::kSuccess:
       return;
     default:

googletest/test/BUILD.bazel

@@ -295,6 +295,14 @@ cc_test(
     deps = ["//:gtest_main"],
 )
 
+py_test(
+    name = "gtest_skip_check_output_test",
+    size = "small",
+    srcs = ["gtest_skip_check_output_test.py"],
+    data = [":gtest_skip_test"],
+    deps = [":gtest_test_utils"],
+)
+
 py_test(
     name = "gtest_skip_environment_check_output_test",
     size = "small",

googletest/test/gtest_skip_check_output_test.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python
+#
+# Copyright 2019 Google LLC.  All Rights Reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+"""Tests Google Test's gtest skip in environment setup  behavior.
+
+This script invokes gtest_skip_in_environment_setup_test_ and verifies its
+output.
+"""
+
+import gtest_test_utils
+import re
+
+# Path to the gtest_skip_in_environment_setup_test binary
+EXE_PATH = gtest_test_utils.GetTestExecutablePath('gtest_skip_test')
+
+OUTPUT = gtest_test_utils.Subprocess([EXE_PATH]).output
+
+
+# Test.
+class SkipEntireEnvironmentTest(gtest_test_utils.TestCase):
+
+  def testSkipEntireEnvironmentTest(self):
+    self.assertIn('Skipped\nskipping single test\n', OUTPUT)
+    skip_fixture = 'Skipped\nskipping all tests for this fixture\n'
+    self.assertTrue(
+      re.search(
+        skip_fixture + '.*' + skip_fixture, OUTPUT, flags=re.DOTALL
+      ) is not None, 
+      repr(OUTPUT)
+    )
+    self.assertNotIn('FAILED', OUTPUT)
+
+
+if __name__ == '__main__':
+  gtest_test_utils.Main()

googletest/test/gtest_skip_test.cc

@@ -35,7 +35,7 @@
 using ::testing::Test;
 
 TEST(SkipTest, DoesSkip) {
-  GTEST_SKIP();
+  GTEST_SKIP() << "skipping single test";
   EXPECT_EQ(0, 1);
 }