diff --git a/generator/test/error_test.dart b/generator/test/error_test.dart
index fdd477f1b5..5f4898fb27 100644
--- a/generator/test/error_test.dart
+++ b/generator/test/error_test.dart
@@ -15,7 +15,7 @@ void main() {
             (e) => e.format().trim(),
             'format()',
             myersDiff(
-              (await File(path.join(directory, outputFile)).readAsString()).trim(),
+              (await File(path.join(directory, outputFile)).readFileAsErrorFormattedString()).trim(),
             ),
           ),
         ),
diff --git a/generator/test/info_test.dart b/generator/test/info_test.dart
index 45b8ee8640..c0573a82b7 100644
--- a/generator/test/info_test.dart
+++ b/generator/test/info_test.dart
@@ -1,4 +1,7 @@
+import 'dart:io';
+
 import 'package:build_test/build_test.dart';
+import 'package:path/path.dart' as path;
 import 'package:realm_generator/realm_generator.dart';
 import 'package:test/test.dart';
 import 'test_util.dart';
@@ -25,8 +28,8 @@ void main() {
       );
 
       expect(
-        sb.toString(),
-        await readFileAsErrorFormattedString(directory, outputFile),
+        sb.toString().trim(),
+        (await File(path.join(directory, outputFile)).readFileAsErrorFormattedString()).trim(),
       );
     });
   });
diff --git a/generator/test/test_util.dart b/generator/test/test_util.dart
index eeb066f0da..d609b743bd 100644
--- a/generator/test/test_util.dart
+++ b/generator/test/test_util.dart
@@ -189,16 +189,17 @@ Future<String> readFileAsDartFormattedString(String path) async {
   return _stringReplacements(content);
 }
 
-Future<String> readFileAsErrorFormattedString(String directoryName, String outputFilePath) async {
-  var file = File(_path.join(Directory.current.path, '$directoryName/$outputFilePath'));
-  String content = await file.readAsString(encoding: utf8);
-  if (Platform.isWindows) {
-    var macToWinSymbols = {'╷': ',', '━': '=', '╵': '\'', '│': '|', '─': '-', '┌': ',', '└': '\''};
-    macToWinSymbols.forEach((key, value) {
-      content = content.replaceAll(key, value);
-    });
+extension FileEx on File {
+  Future<String> readFileAsErrorFormattedString() async {
+    var content = await readAsString(encoding: utf8);
+    if (Platform.isWindows) {
+      var macToWinSymbols = {'╷': ',', '━': '=', '╵': '\'', '│': '|', '─': '-', '┌': ',', '└': '\''};
+      macToWinSymbols.forEach((key, value) {
+        content = content.replaceAll(key, value);
+      });
+    }
+    return LineSplitter.split(content).join('\n');
   }
-  return LineSplitter.split(content).join('\n');
 }
 
 String _stringReplacements(String content) {