def METHOD_NAME(self):
    with self.assertRaises(FileNotFoundError):
        CCache.loadFile("NON_EXISTENT")
    for cache_file in [self.cache_v1_file,
                       self.cache_v2_file]:
        with self.assertRaises(NotImplementedError):
            CCache.loadFile(cache_file)
    for cache_file in [self.cache_v3_file,
                       self.cache_v4_file]:
        ccache = CCache.loadFile(cache_file)
        self.assert_ccache(ccache)