isbn_verifier_test.go

package isbn

import (
	"testing"
)

var testCases = []struct {
	isbn        string
	expected    bool
	description string
}{
	{"3-598-21508-8", true, "valid isbn number"},
	{"3-598-21508-9", false, "invalid isbn check digit"},
	{"3-598-21507-X", true, "valid isbn number with a check digit of 10"},
	{"3-598-21507-A", false, "check digit is a character other than X"},
	{"3-598-2K507-0", false, "invalid character in isbn"},
	{"3-598-2X507-0", false, "X is only valid as a check digit"},
	{"3598215088", true, "valid isbn without separating dashes"},
	{"359821507X", true, "isbn without separating dashes and X as check digit"},
	{"359821507", false, "isbn without check digit and dashes"},
	{"3598215078X", false, "too long isbn and no dashes"},
	{"3-598-21507", false, "isbn without check digit"},
	{"3-598-21507-XA", false, "too long isbn"},
	{"3-598-21515-X", false, "check digit of X should not be used for 0"},
}

func TestIsValidISBN(t *testing.T) {
	for _, test := range testCases {
		observed := IsValidISBN(test.isbn)
		if observed != test.expected {
			t.Fatalf("got %t, want %t, %s (%s)",
				observed, test.expected, test.description, test.isbn)
		}
	}
}