test_record.py 文件源码

def test_record_bad():
    """
    Tests that when we record a sequence of events, then
    do something different on playback, the Record class catches it.
    """

    # Record a sequence of events
    output = StringIO()

    recorder = Record(file_object=output, replay=False)

    num_lines = 10

    for i in xrange(num_lines):
        recorder.handle_line(str(i) + '\n')

    # Make sure that the playback functionality doesn't raise any errors
    # when we repeat some of them
    output_value = output.getvalue()
    output = StringIO(output_value)

    playback_checker = Record(file_object=output, replay=True)

    for i in xrange(num_lines // 2):
        playback_checker.handle_line(str(i) + '\n')

    # Make sure it raises an error when we deviate from the recorded sequence
    try:
        playback_checker.handle_line('0\n')
    except MismatchError:
        return
    raise AssertionError("Failed to detect mismatch between recorded sequence "
                         " and repetition of it.")