{
    "exercise": "isbn-verifier",
    "version": "2.5.0",
    "comments": [
        "An expected value of true indicates a valid ISBN-10, ",
        "whereas false means the ISBN-10 is invalid."
    ],
    "cases": [
        {
            "description": "valid isbn number",
            "property": "isValid",
            "input": {
              "isbn": "3-598-21508-8"
            },
            "expected": true
        },
        {
            "description": "invalid isbn check digit",
            "property": "isValid",
            "input": {
              "isbn": "3-598-21508-9"
            },
            "expected": false
        },
        {
            "description": "valid isbn number with a check digit of 10",
            "property": "isValid",
            "input": {
              "isbn": "3-598-21507-X"
            },
            "expected": true
        },
        {
            "description": "check digit is a character other than X",
            "property": "isValid",
            "input": {
              "isbn": "3-598-21507-A"
            },
            "expected": false
        },
        {
            "description": "invalid character in isbn",
            "property": "isValid",
            "input": {
              "isbn": "3-598-P1581-X"
            },
            "expected": false
        },
        {
            "description": "X is only valid as a check digit",
            "property": "isValid",
            "input": {
              "isbn": "3-598-2X507-9"
            },
            "expected": false
        },
        {
            "description": "valid isbn without separating dashes",
            "property": "isValid",
            "input": {
              "isbn": "3598215088"
            },
            "expected": true
        },
        {
            "description": "isbn without separating dashes and X as check digit",
            "property": "isValid",
            "input": {
              "isbn": "359821507X"
            },
            "expected": true
        },
        {
            "description": "isbn without check digit and dashes",
            "property": "isValid",
            "input": {
              "isbn": "359821507"
            },
            "expected": false
        },
        {
            "description": "too long isbn and no dashes",
            "property": "isValid",
            "input": {
              "isbn": "3598215078X"
            },
            "expected": false
        },
        {
            "description": "isbn without check digit",
            "property": "isValid",
            "input": {
              "isbn": "3-598-21507"
            },
            "expected": false
        },
        {
            "description": "too long isbn",
            "property": "isValid",
            "input": {
              "isbn": "3-598-21507-XX"
            },
            "expected": false
        },
        {
            "description": "check digit of X should not be used for 0",
            "property": "isValid",
            "input": {
              "isbn": "3-598-21515-X"
            },
            "expected": false
        },
        {
            "description": "empty isbn",
            "property": "isValid",
            "input": {
              "isbn": ""
            },
            "expected": false
        },
        {
            "description": "input is 9 characters",
            "property": "isValid",
            "input": {
                "isbn": "134456729"
            },
            "expected": false
        },
        {
            "description": "invalid characters are not ignored",
            "property": "isValid",
            "input": {
                "isbn": "3132P34035"
            },
            "expected": false
        }
    ]
}