Provide plugin unit test for gtest code parsing

This test needs environment variable GOOGLETEST_DIR to point to
an existing checkout of the googletest repository, or it will
be skipped.

Change-Id: I1e0ba250da84143b50f70589113ab6d6ea3a5b73
Reviewed-by: Niels Weber <niels.weber@theqtcompany.com>

plugins/autotest/testcodeparser.cpp

@@ -1079,6 +1079,11 @@ int TestCodeParser::unnamedQuickTestsCount() const
 {
     return m_unnamedQuickDocList.size();
 }
+
+int TestCodeParser::gtestNamesAndSetsCount() const
+{
+    return m_gtestDocList.size();
+}
 #endif
 
 } // namespace Internal