Example #1
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def test_input_is_nine_characters():
    assert not is_valid('134456729')
Example #2
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def test_invalid_characters_are_not_ignored():
    assert not is_valid('3132P34035')
Example #3
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def test_invalid_check_digit_X_used_for_0():
    assert not is_valid('3-598-21515-X')
Example #4
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def test_valid_empty_isbn():
    assert not is_valid('')
Example #5
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def test_invalid_isbn_without_check_digit():
    assert not is_valid('3-598-21507')
Example #6
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def test_valid_isbn_number():
    assert is_valid('3-598-21508-8')
Example #7
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def test_invalid_too_long_isbn_with_no_dashes():
    assert not is_valid('3598215078X')
Example #8
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def test_invalid_check_digit_other_than_X():
    assert not is_valid('3-598-21507-A')
Example #9
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def test_valid_isbn_without_separating_dashes_with_X_check_digit():
    assert is_valid('359821507X')
Example #10
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def test_invalid_isbn_without_check_digit_and_dashes():
    assert not is_valid('359821507')
Example #11
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def test_valid_isbn_without_separating_dashes():
    assert is_valid('3598215088')
Example #12
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def test_invalid_X_other_than_check_digit():
    assert not is_valid('3-598-2X507-9')
Example #13
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def test_invalid_character_in_isbn():
    assert not is_valid('3-598-P1581-X')
Example #14
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def test_input_is_too_long_but_contains_a_valid_isbn():
    assert not is_valid('98245726788')
Example #15
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def test_invalid_too_short_isbn():
    assert not is_valid('00')
Example #16
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def test_invalid_check_digit():
    assert not is_valid('3-598-21508-9')
Example #17
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def test_valid_with_X_check_digit():
    assert is_valid('3-598-21507-X')