async def test_compress_decorator(compress, body, called, expected):
cls = Mock()
request = Mock()
cls.compress = compress
cls.body = body
cls.func = CoroutineMock()
cls.func = _add_compress_header(cls.func)
await cls.func(cls, request)
assert request.add_header.called is called
if request.add_header.call_args:
assert isinstance(request.add_header.call_args[0][0], expected)
