def test_find_pattern_has_repeat_after_filler():
    """Confirm that if pattern exists, we detect it."""

    has_repeat = ['0', '1', '2', '1', '2', '1', '2']
    assert find_pattern(has_repeat) == 2
def test_find_pattern_no_repeat():
    """Confirm that if no pattern exists, we get 0."""

    no_repeat = ['1', '2', '5']
    assert find_pattern(no_repeat) == 0