Clean out any remaining files after the test

Used in: The modifier list of a test definition. See TEST(name, ...)

Post mortem action for EXPECT_EXIT(num, action?) and EXPECT_SIGNAL_DEATH(signo, action?) which clears all files in the working directory of the test case process.

	Tip
	This can be useful when doing negative tests for functions that create files, or use fixtures that set up a file structure.

	Note
	This action is disabled if running with the -s / --single-shot command line parameter.