def test_frames_to_json(watson):
watson.start('foo', tags=['A', 'B'])
watson.stop()
result = json.loads(frames_to_json(watson.frames))
keys = {'id', 'start', 'stop', 'project', 'tags'}
assert len(result) == 1
assert set(result[0].keys()) == keys
assert result[0]['project'] == 'foo'
assert result[0]['tags'] == ['A', 'B']
def test_frames_to_json_empty_data(watson):
assert frames_to_json(watson.frames) == '[]'