def test_is_datetime_utc_given_utc_datetime_returns_true(self):
        # Arrange
        dt = datetime(2013, 1, 1, 1, 0, tzinfo=pytz.utc)

        # Act
        # Assert
        assert is_datetime_utc(dt) is True
    def test_is_datetime_utc_given_tz_naive_datetime_returns_false(self):
        # Arrange
        dt = datetime(2013, 1, 1, 1, 0)

        # Act
        # Assert
        assert is_datetime_utc(dt) is False