Add a hint for limiting the test scope

test/gtest_example.cpp

@@ -16,5 +16,7 @@ TEST(TestTest, DummyTestExample)
 int main(int argc, char **argv)
 {
   testing::InitGoogleTest(&argc, argv);
+  //::testing::GTEST_FLAG(filter) = "TestTest.DummyTestExample"; // Test only this one
+  //::testing::GTEST_FLAG(filter) = "TestTest.*"; // Test only the tests in this group
   return RUN_ALL_TESTS();
 }