exercism/zig/isbn-verifier/test_isbn_verifier.zig

const std = @import("std");
const testing = std.testing;

const isValidIsbn10 = @import("isbn_verifier.zig").isValidIsbn10;

test "valid ISBN" {
    try testing.expect(isValidIsbn10("3-598-21508-8"));
}

test "invalid ISBN check digit" {
    try testing.expect(!isValidIsbn10("3-598-21508-9"));
}

test "valid ISBN with a check digit of 10" {
    try testing.expect(isValidIsbn10("3-598-21507-X"));
}

test "check digit is a character other than x" {
    try testing.expect(!isValidIsbn10("3-598-21507-A"));
}

test "invalid check digit in ISBN is not treated as zero" {
    try testing.expect(!isValidIsbn10("4-598-21507-B"));
}

test "invalid character in ISBN is not treated as zero" {
    try testing.expect(!isValidIsbn10("3-598-P1581-X"));
}

test "x is only valid as a check digit" {
    try testing.expect(!isValidIsbn10("3-598-2X507-9"));
}

test "valid ISBN without separating dashes" {
    try testing.expect(isValidIsbn10("3598215088"));
}

test "ISBN without separating dashes and x as check digit" {
    try testing.expect(isValidIsbn10("359821507X"));
}

test "ISBN without check digit and dashes" {
    try testing.expect(!isValidIsbn10("359821507"));
}

test "too long ISBN and no dashes" {
    try testing.expect(!isValidIsbn10("3598215078X"));
}

test "too short ISBN" {
    try testing.expect(!isValidIsbn10("00"));
}

test "ISBN without check digit" {
    try testing.expect(!isValidIsbn10("3-598-21507"));
}

test "check digit of x should not be used for 0" {
    try testing.expect(!isValidIsbn10("3-598-21515-X"));
}

test "empty ISBN" {
    try testing.expect(!isValidIsbn10(""));
}

test "input is 9 characters" {
    try testing.expect(!isValidIsbn10("134456729"));
}

test "invalid characters are not ignored after checking length" {
    try testing.expect(!isValidIsbn10("3132P34035"));
}

test "invalid characters are not ignored before checking length" {
    try testing.expect(!isValidIsbn10("3598P215088"));
}

test "input is too long but contains a valid ISBN" {
    try testing.expect(!isValidIsbn10("98245726788"));
}