def METHOD_NAME(self):
    # download test file once
    self.tmpdir = tempfile.mkdtemp()
    self.video_only_path = str(Path(self.tmpdir) / "demo.m4v")
    test_url = os.getenv(
        "ZOU_TEST_VIDEO_URL", "http://fate-suite.ffmpeg.org/mpeg4/demo.m4v"
    )
    request.urlretrieve(test_url, self.video_only_path)