def test_for_valid_acknowledged_state():
    cases = [
        ("all", True),
        ("true", True),
        ("false", True),
        ("2010-02-29", False),
        ("invalid", False)
    ]

    for example, expected in cases:
        assert_equal(is_valid_acknowledged_state(example), expected)
def test_for_valid_acknowledged_state():
    cases = [
        ("all", True),
        ("true", True),
        ("false", True),
        ("2010-02-29", False),
        ("invalid", False)
    ]

    for example, expected in cases:
        yield assert_equal, is_valid_acknowledged_state(example), expected