package validate import "testing" func TestChars(t *testing.T) { type TestCase struct { Input string C string Err error } hexRange := "0123456789abcdef" testCases := []TestCase{ {Input: "abcd1234", C: hexRange}, {Input: "abcd 1234", C: hexRange, Err: ErrDisallowedChars}, } for _, tc := range testCases { t.Logf("Testing %q against %q", tc.Input, tc.C) f := Chars(tc.C) err := f(tc.Input) if err != tc.Err { t.Errorf("Expected error %v, got %v", tc.Err, err) } } }