def METHOD_NAME():
    """Fixture returning a filename to an existent .test file."""
    fp = tempfile.NamedTemporaryFile(suffix='.test', delete=False)
    fp.write(b"test")
    fp.close()
    filename = Filename.from_os_specific(fp.name)
    filename.make_true_case()
    yield filename
    os.unlink(fp.name)