def test_contains_iol():
validator = Validator()
assert_equals(True, validator._contains_iol("hijklmn"))
assert_equals(True, validator._contains_iol("aaibb"))
assert_equals(True, validator._contains_iol("aaobb"))
assert_equals(True, validator._contains_iol("aalbb"))
assert_equals(False, validator._contains_iol("aaxbb"))
def test_contains_sequence_of_three():
validator = Validator()
assert_equals(True, validator._contains_sequence_of_three("xxabcyy"))
assert_equals(False, validator._contains_sequence_of_three("abdce"))
def test_contains_two_different_pairs():
validator = Validator()
assert_equals(True, validator._contains_two_different_pairs("abbceffg"))
assert_equals(False, validator._contains_two_different_pairs("abbcefg"))
