package validate import ( "errors" "testing" ) func TestEmail(t *testing.T) { type TestCase struct { Input string Err error } testCases := []TestCase{ {Input: "test@example.com"}, {Input: "testexample.com", Err: ErrInvalidEmail}, } for n, tc := range testCases { t.Logf("(%d) Testing %q", n, tc.Input) err := Email(tc.Input) if !errors.Is(err, tc.Err) { t.Errorf("Expected error %v, got %v", tc.Err, err) } } }