Checks whether there are underscores in googletest test and test case names in test macros:

The FRIEND_TEST macro is not included.

For example:

TEST(TestCaseName, Illegal_TestName) {}
TEST(Illegal_TestCaseName, TestName) {}

would trigger the check. Underscores are not allowed in test names nor test case names.

The DISABLED_ prefix, which may be used to disable individual tests, is ignored when checking test names, but the rest of the rest of the test name is still checked.

This check does not propose any fixes.