executor: adds OriginalError tests

Author: chris-ramon

executor_test.go

@@ -2046,7 +2046,7 @@ func (err extendedError) Extensions() map[string]interface{} {
 
 var _ gqlerrors.ExtendedError = &extendedError{}
 
-func testErrors(t *testing.T, nameType graphql.Output, extensions map[string]interface{}) *graphql.Result {
+func testErrors(t *testing.T, nameType graphql.Output, extensions map[string]interface{}, formatErrorFn func(err error) error) *graphql.Result {
 	type Hero struct {
 		Id      string `graphql:"id"`
 		Name    string
@@ -2073,7 +2073,12 @@ func testErrors(t *testing.T, nameType graphql.Output, extensions map[string]int
 				if hero.Name != "" {
 					return hero.Name, nil
 				}
+
 				err := fmt.Errorf("Name for character with ID %v could not be fetched.", hero.Id)
+				if formatErrorFn != nil {
+					err = formatErrorFn(err)
+				}
+
 				if extensions != nil {
 					return nil, &extendedError{
 						error:      err,
@@ -2134,7 +2139,7 @@ func testErrors(t *testing.T, nameType graphql.Output, extensions map[string]int
 
 // http://facebook.github.io/graphql/June2018/#example-bc485
 func TestQuery_ErrorPath(t *testing.T) {
-	result := testErrors(t, graphql.String, nil)
+	result := testErrors(t, graphql.String, nil, nil)
 
 	assertJSON(t, `{
 	  "errors": [
@@ -2168,7 +2173,7 @@ func TestQuery_ErrorPath(t *testing.T) {
 
 // http://facebook.github.io/graphql/June2018/#example-08b62
 func TestQuery_ErrorPathForNonNullField(t *testing.T) {
-	result := testErrors(t, graphql.NewNonNull(graphql.String), nil)
+	result := testErrors(t, graphql.NewNonNull(graphql.String), nil, nil)
 
 	assertJSON(t, `{
 	  "errors": [
@@ -2202,7 +2207,7 @@ func TestQuery_ErrorExtensions(t *testing.T) {
 	result := testErrors(t, graphql.NewNonNull(graphql.String), map[string]interface{}{
 		"code":      "CAN_NOT_FETCH_BY_ID",
 		"timestamp": "Fri Feb 9 14:33:09 UTC 2018",
-	})
+	}, nil)
 
 	assertJSON(t, `{
 	  "errors": [
@@ -2233,3 +2238,70 @@ func TestQuery_ErrorExtensions(t *testing.T) {
 	  }
 	}`, result)
 }
+
+func TestQuery_OriginalErrorBuiltin(t *testing.T) {
+	result := testErrors(t, graphql.String, nil, nil)
+	originalError := result.Errors[0].OriginalError()
+	switch originalError.(type) {
+	case error:
+	default:
+		t.Fatalf("unexpected error: %v", reflect.TypeOf(originalError))
+	}
+}
+
+func TestQuery_OriginalErrorExtended(t *testing.T) {
+	result := testErrors(t, graphql.String, map[string]interface{}{
+		"code": "CAN_NOT_FETCH_BY_ID",
+	}, nil)
+	originalError := result.Errors[0].OriginalError()
+	switch originalError.(type) {
+	case *extendedError:
+	case extendedError:
+	default:
+		t.Fatalf("unexpected error: %v", reflect.TypeOf(originalError))
+	}
+}
+
+type customError struct {
+	error
+}
+
+func (e customError) Error() string {
+	return e.error.Error()
+}
+
+func TestQuery_OriginalErrorCustom(t *testing.T) {
+	result := testErrors(t, graphql.String, nil, func(err error) error {
+		return customError{error: err}
+	})
+	originalError := result.Errors[0].OriginalError()
+	switch originalError.(type) {
+	case customError:
+	default:
+		t.Fatalf("unexpected error: %v", reflect.TypeOf(originalError))
+	}
+}
+
+func TestQuery_OriginalErrorCustomPtr(t *testing.T) {
+	result := testErrors(t, graphql.String, nil, func(err error) error {
+		return &customError{error: err}
+	})
+	originalError := result.Errors[0].OriginalError()
+	switch originalError.(type) {
+	case *customError:
+	default:
+		t.Fatalf("unexpected error: %v", reflect.TypeOf(originalError))
+	}
+}
+
+func TestQuery_OriginalErrorPanic(t *testing.T) {
+	result := testErrors(t, graphql.String, nil, func(err error) error {
+		panic(errors.New("panic error"))
+	})
+	originalError := result.Errors[0].OriginalError()
+	switch originalError.(type) {
+	case error:
+	default:
+		t.Fatalf("unexpected error: %v", reflect.TypeOf(originalError))
+	}
+}