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