diff --git a/packages/file_selector/file_selector/CHANGELOG.md b/packages/file_selector/file_selector/CHANGELOG.md
index fe01ffec47b6..64ac5959a7c0 100644
--- a/packages/file_selector/file_selector/CHANGELOG.md
+++ b/packages/file_selector/file_selector/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.8.0
+
+Migrate to null safety.
+
 ## 0.7.0+2
 
 * Update the example app: remove the deprecated `RaisedButton` and `FlatButton` widgets.
diff --git a/packages/file_selector/file_selector/example/lib/get_directory_page.dart b/packages/file_selector/file_selector/example/lib/get_directory_page.dart
index 6463fb532957..cf4cde9fa9a8 100644
--- a/packages/file_selector/file_selector/example/lib/get_directory_page.dart
+++ b/packages/file_selector/file_selector/example/lib/get_directory_page.dart
@@ -5,9 +5,13 @@ import 'package:flutter/material.dart';
 class GetDirectoryPage extends StatelessWidget {
   void _getDirectoryPath(BuildContext context) async {
     final String confirmButtonText = 'Choose';
-    final String directoryPath = await getDirectoryPath(
+    final String? directoryPath = await getDirectoryPath(
       confirmButtonText: confirmButtonText,
     );
+    if (directoryPath == null) {
+      // Operation was canceled by the user.
+      return;
+    }
     await showDialog(
       context: context,
       builder: (context) => TextDisplay(directoryPath),
diff --git a/packages/file_selector/file_selector/example/lib/open_image_page.dart b/packages/file_selector/file_selector/example/lib/open_image_page.dart
index 593a1d60aed8..986bfe712893 100644
--- a/packages/file_selector/file_selector/example/lib/open_image_page.dart
+++ b/packages/file_selector/file_selector/example/lib/open_image_page.dart
@@ -11,6 +11,10 @@ class OpenImagePage extends StatelessWidget {
       extensions: ['jpg', 'png'],
     );
     final List<XFile> files = await openFiles(acceptedTypeGroups: [typeGroup]);
+    if (files.isEmpty) {
+      // Operation was canceled by the user.
+      return;
+    }
     final XFile file = files[0];
     final String fileName = file.name;
     final String filePath = file.path;
diff --git a/packages/file_selector/file_selector/example/lib/open_multiple_images_page.dart b/packages/file_selector/file_selector/example/lib/open_multiple_images_page.dart
index 58b59cd91b03..c6f73f5aed12 100644
--- a/packages/file_selector/file_selector/example/lib/open_multiple_images_page.dart
+++ b/packages/file_selector/file_selector/example/lib/open_multiple_images_page.dart
@@ -18,6 +18,10 @@ class OpenMultipleImagesPage extends StatelessWidget {
       jpgsTypeGroup,
       pngTypeGroup,
     ]);
+    if (files.isEmpty) {
+      // Operation was canceled by the user.
+      return;
+    }
     await showDialog(
       context: context,
       builder: (context) => MultipleImagesDisplay(files),
diff --git a/packages/file_selector/file_selector/example/lib/open_text_page.dart b/packages/file_selector/file_selector/example/lib/open_text_page.dart
index 299d0e2dc21a..74d79dd72b19 100644
--- a/packages/file_selector/file_selector/example/lib/open_text_page.dart
+++ b/packages/file_selector/file_selector/example/lib/open_text_page.dart
@@ -8,7 +8,11 @@ class OpenTextPage extends StatelessWidget {
       label: 'text',
       extensions: ['txt', 'json'],
     );
-    final XFile file = await openFile(acceptedTypeGroups: [typeGroup]);
+    final XFile? file = await openFile(acceptedTypeGroups: [typeGroup]);
+    if (file == null) {
+      // Operation was canceled by the user.
+      return;
+    }
     final String fileName = file.name;
     final String fileContent = await file.readAsString();
 
diff --git a/packages/file_selector/file_selector/example/lib/save_text_page.dart b/packages/file_selector/file_selector/example/lib/save_text_page.dart
index 47408662ecee..82046c35128a 100644
--- a/packages/file_selector/file_selector/example/lib/save_text_page.dart
+++ b/packages/file_selector/file_selector/example/lib/save_text_page.dart
@@ -8,7 +8,11 @@ class SaveTextPage extends StatelessWidget {
   final TextEditingController _contentController = TextEditingController();
 
   void _saveFile() async {
-    final String path = await getSavePath();
+    String? path = await getSavePath();
+    if (path == null) {
+      // Operation was canceled by the user.
+      return;
+    }
     final String text = _contentController.text;
     final String fileName = _nameController.text;
     final Uint8List fileData = Uint8List.fromList(text.codeUnits);
diff --git a/packages/file_selector/file_selector/example/pubspec.yaml b/packages/file_selector/file_selector/example/pubspec.yaml
index 3af2a67e9e93..580237cad5ac 100644
--- a/packages/file_selector/file_selector/example/pubspec.yaml
+++ b/packages/file_selector/file_selector/example/pubspec.yaml
@@ -1,24 +1,12 @@
 name: example
 description: A new Flutter project.
 
-# The following line prevents the package from being accidentally published to
-# pub.dev using `pub publish`. This is preferred for private packages.
 publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 
-# The following defines the version and build number for your application.
-# A version number is three numbers separated by dots, like 1.2.43
-# followed by an optional build number separated by a +.
-# Both the version and the builder number may be overridden in flutter
-# build by specifying --build-name and --build-number, respectively.
-# In Android, build-name is used as versionName while build-number used as versionCode.
-# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
-# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
-# Read more about iOS versioning at
-# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: ">=2.12.0-259.9.beta <3.0.0"
 
 dependencies:
   flutter:
@@ -32,52 +20,9 @@ dependencies:
     # the parent directory to use the current plugin's version.
     path: ../
 
-  # The following adds the Cupertino Icons font to your application.
-  # Use with the CupertinoIcons class for iOS style icons.
-  cupertino_icons: ^0.1.3
-
 dev_dependencies:
   flutter_test:
     sdk: flutter
 
-# For information on the generic Dart part of this file, see the
-# following page: https://dart.dev/tools/pub/pubspec
-
-# The following section is specific to Flutter.
 flutter:
-
-  # The following line ensures that the Material Icons font is
-  # included with your application, so that you can use the icons in
-  # the material Icons class.
   uses-material-design: true
-
-  # To add assets to your application, add an assets section, like this:
-  # assets:
-  #   - images/a_dot_burr.jpeg
-  #   - images/a_dot_ham.jpeg
-
-  # An image asset can refer to one or more resolution-specific "variants", see
-  # https://flutter.dev/assets-and-images/#resolution-aware.
-
-  # For details regarding adding assets from package dependencies, see
-  # https://flutter.dev/assets-and-images/#from-packages
-
-  # To add custom fonts to your application, add a fonts section here,
-  # in this "flutter" section. Each entry in this list should have a
-  # "family" key with the font family name, and a "fonts" key with a
-  # list giving the asset and other descriptors for the font. For
-  # example:
-  # fonts:
-  #   - family: Schyler
-  #     fonts:
-  #       - asset: fonts/Schyler-Regular.ttf
-  #       - asset: fonts/Schyler-Italic.ttf
-  #         style: italic
-  #   - family: Trajan Pro
-  #     fonts:
-  #       - asset: fonts/TrajanPro.ttf
-  #       - asset: fonts/TrajanPro_Bold.ttf
-  #         weight: 700
-  #
-  # For details regarding fonts from package dependencies,
-  # see https://flutter.dev/custom-fonts/#from-packages
diff --git a/packages/file_selector/file_selector/lib/file_selector.dart b/packages/file_selector/file_selector/lib/file_selector.dart
index 080eac4460ac..cdb2bf9c726d 100644
--- a/packages/file_selector/file_selector/lib/file_selector.dart
+++ b/packages/file_selector/file_selector/lib/file_selector.dart
@@ -10,10 +10,10 @@ export 'package:file_selector_platform_interface/file_selector_platform_interfac
     show XFile, XTypeGroup;
 
 /// Open file dialog for loading files and return a file path
-Future<XFile> openFile({
-  List<XTypeGroup> acceptedTypeGroups,
-  String initialDirectory,
-  String confirmButtonText,
+Future<XFile?> openFile({
+  List<XTypeGroup> acceptedTypeGroups = const <XTypeGroup>[],
+  String? initialDirectory,
+  String? confirmButtonText,
 }) {
   return FileSelectorPlatform.instance.openFile(
       acceptedTypeGroups: acceptedTypeGroups,
@@ -23,9 +23,9 @@ Future<XFile> openFile({
 
 /// Open file dialog for loading files and return a list of file paths
 Future<List<XFile>> openFiles({
-  List<XTypeGroup> acceptedTypeGroups,
-  String initialDirectory,
-  String confirmButtonText,
+  List<XTypeGroup> acceptedTypeGroups = const <XTypeGroup>[],
+  String? initialDirectory,
+  String? confirmButtonText,
 }) {
   return FileSelectorPlatform.instance.openFiles(
       acceptedTypeGroups: acceptedTypeGroups,
@@ -34,11 +34,11 @@ Future<List<XFile>> openFiles({
 }
 
 /// Saves File to user's file system
-Future<String> getSavePath({
-  List<XTypeGroup> acceptedTypeGroups,
-  String initialDirectory,
-  String suggestedName,
-  String confirmButtonText,
+Future<String?> getSavePath({
+  List<XTypeGroup> acceptedTypeGroups = const <XTypeGroup>[],
+  String? initialDirectory,
+  String? suggestedName,
+  String? confirmButtonText,
 }) async {
   return FileSelectorPlatform.instance.getSavePath(
       acceptedTypeGroups: acceptedTypeGroups,
@@ -48,9 +48,9 @@ Future<String> getSavePath({
 }
 
 /// Gets a directory path from a user's file system
-Future<String> getDirectoryPath({
-  String initialDirectory,
-  String confirmButtonText,
+Future<String?> getDirectoryPath({
+  String? initialDirectory,
+  String? confirmButtonText,
 }) async {
   return FileSelectorPlatform.instance.getDirectoryPath(
       initialDirectory: initialDirectory, confirmButtonText: confirmButtonText);
diff --git a/packages/file_selector/file_selector/pubspec.yaml b/packages/file_selector/file_selector/pubspec.yaml
index a55b7f4e06e7..34b459cca720 100644
--- a/packages/file_selector/file_selector/pubspec.yaml
+++ b/packages/file_selector/file_selector/pubspec.yaml
@@ -1,21 +1,20 @@
 name: file_selector
 description: Flutter plugin for opening and saving files.
 homepage: https://github.com/flutter/plugins/tree/master/packages/file_selector/file_selector
-version: 0.7.0+2
+version: 0.8.0
 
 dependencies:
   flutter:
     sdk: flutter
-  file_selector_platform_interface: ^1.0.0
+  file_selector_platform_interface: ^2.0.0
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  test: ^1.3.0
-  mockito: ^4.1.1
-  plugin_platform_interface: ^1.0.0
-  pedantic: ^1.8.0
+  test: ^1.16.3
+  plugin_platform_interface: ">=1.0.0 <3.0.0"
+  pedantic: ^1.10.0
 
 environment:
-  sdk: ">=2.1.0 <3.0.0"
-  flutter: ">=1.12.13+hotfix.5"
+  sdk: ">=2.12.0-259.9.beta <3.0.0"
+  flutter: ">=1.20.0"
diff --git a/packages/file_selector/file_selector/test/file_selector_test.dart b/packages/file_selector/file_selector/test/file_selector_test.dart
index 15756cc2b622..b16f234bb3b8 100644
--- a/packages/file_selector/file_selector/test/file_selector_test.dart
+++ b/packages/file_selector/file_selector/test/file_selector_test.dart
@@ -3,13 +3,13 @@
 // found in the LICENSE file.
 
 import 'package:flutter_test/flutter_test.dart';
-import 'package:mockito/mockito.dart';
 import 'package:plugin_platform_interface/plugin_platform_interface.dart';
 import 'package:file_selector/file_selector.dart';
 import 'package:file_selector_platform_interface/file_selector_platform_interface.dart';
+import 'package:test/fake.dart';
 
 void main() {
-  MockFileSelector mock;
+  late FakeFileSelector fakePlatformImplementation;
   final initialDirectory = '/home/flutteruser';
   final confirmButtonText = 'Use this profile picture';
   final suggestedName = 'suggested_name';
@@ -25,19 +25,20 @@ void main() {
   ];
 
   setUp(() {
-    mock = MockFileSelector();
-    FileSelectorPlatform.instance = mock;
+    fakePlatformImplementation = FakeFileSelector();
+    FileSelectorPlatform.instance = fakePlatformImplementation;
   });
 
   group('openFile', () {
     final expectedFile = XFile('path');
 
     test('works', () async {
-      when(mock.openFile(
-        initialDirectory: initialDirectory,
-        confirmButtonText: confirmButtonText,
-        acceptedTypeGroups: acceptedTypeGroups,
-      )).thenAnswer((_) => Future.value(expectedFile));
+      fakePlatformImplementation
+        ..setExpectations(
+            initialDirectory: initialDirectory,
+            confirmButtonText: confirmButtonText,
+            acceptedTypeGroups: acceptedTypeGroups)
+        ..setFileResponse(<XFile>[expectedFile]);
 
       final file = await openFile(
         initialDirectory: initialDirectory,
@@ -49,7 +50,7 @@ void main() {
     });
 
     test('works with no arguments', () async {
-      when(mock.openFile()).thenAnswer((_) => Future.value(expectedFile));
+      fakePlatformImplementation.setFileResponse(<XFile>[expectedFile]);
 
       final file = await openFile();
 
@@ -57,24 +58,27 @@ void main() {
     });
 
     test('sets the initial directory', () async {
-      when(mock.openFile(initialDirectory: initialDirectory))
-          .thenAnswer((_) => Future.value(expectedFile));
+      fakePlatformImplementation
+        ..setExpectations(initialDirectory: initialDirectory)
+        ..setFileResponse(<XFile>[expectedFile]);
 
       final file = await openFile(initialDirectory: initialDirectory);
       expect(file, expectedFile);
     });
 
     test('sets the button confirmation label', () async {
-      when(mock.openFile(confirmButtonText: confirmButtonText))
-          .thenAnswer((_) => Future.value(expectedFile));
+      fakePlatformImplementation
+        ..setExpectations(confirmButtonText: confirmButtonText)
+        ..setFileResponse(<XFile>[expectedFile]);
 
       final file = await openFile(confirmButtonText: confirmButtonText);
       expect(file, expectedFile);
     });
 
     test('sets the accepted type groups', () async {
-      when(mock.openFile(acceptedTypeGroups: acceptedTypeGroups))
-          .thenAnswer((_) => Future.value(expectedFile));
+      fakePlatformImplementation
+        ..setExpectations(acceptedTypeGroups: acceptedTypeGroups)
+        ..setFileResponse(<XFile>[expectedFile]);
 
       final file = await openFile(acceptedTypeGroups: acceptedTypeGroups);
       expect(file, expectedFile);
@@ -85,11 +89,12 @@ void main() {
     final expectedFiles = [XFile('path')];
 
     test('works', () async {
-      when(mock.openFiles(
-        initialDirectory: initialDirectory,
-        confirmButtonText: confirmButtonText,
-        acceptedTypeGroups: acceptedTypeGroups,
-      )).thenAnswer((_) => Future.value(expectedFiles));
+      fakePlatformImplementation
+        ..setExpectations(
+            initialDirectory: initialDirectory,
+            confirmButtonText: confirmButtonText,
+            acceptedTypeGroups: acceptedTypeGroups)
+        ..setFileResponse(expectedFiles);
 
       final file = await openFiles(
         initialDirectory: initialDirectory,
@@ -101,7 +106,7 @@ void main() {
     });
 
     test('works with no arguments', () async {
-      when(mock.openFiles()).thenAnswer((_) => Future.value(expectedFiles));
+      fakePlatformImplementation.setFileResponse(expectedFiles);
 
       final files = await openFiles();
 
@@ -109,24 +114,27 @@ void main() {
     });
 
     test('sets the initial directory', () async {
-      when(mock.openFiles(initialDirectory: initialDirectory))
-          .thenAnswer((_) => Future.value(expectedFiles));
+      fakePlatformImplementation
+        ..setExpectations(initialDirectory: initialDirectory)
+        ..setFileResponse(expectedFiles);
 
       final files = await openFiles(initialDirectory: initialDirectory);
       expect(files, expectedFiles);
     });
 
     test('sets the button confirmation label', () async {
-      when(mock.openFiles(confirmButtonText: confirmButtonText))
-          .thenAnswer((_) => Future.value(expectedFiles));
+      fakePlatformImplementation
+        ..setExpectations(confirmButtonText: confirmButtonText)
+        ..setFileResponse(expectedFiles);
 
       final files = await openFiles(confirmButtonText: confirmButtonText);
       expect(files, expectedFiles);
     });
 
     test('sets the accepted type groups', () async {
-      when(mock.openFiles(acceptedTypeGroups: acceptedTypeGroups))
-          .thenAnswer((_) => Future.value(expectedFiles));
+      fakePlatformImplementation
+        ..setExpectations(acceptedTypeGroups: acceptedTypeGroups)
+        ..setFileResponse(expectedFiles);
 
       final files = await openFiles(acceptedTypeGroups: acceptedTypeGroups);
       expect(files, expectedFiles);
@@ -137,12 +145,13 @@ void main() {
     final expectedSavePath = '/example/path';
 
     test('works', () async {
-      when(mock.getSavePath(
-        initialDirectory: initialDirectory,
-        confirmButtonText: confirmButtonText,
-        acceptedTypeGroups: acceptedTypeGroups,
-        suggestedName: suggestedName,
-      )).thenAnswer((_) => Future.value(expectedSavePath));
+      fakePlatformImplementation
+        ..setExpectations(
+            initialDirectory: initialDirectory,
+            confirmButtonText: confirmButtonText,
+            acceptedTypeGroups: acceptedTypeGroups,
+            suggestedName: suggestedName)
+        ..setPathResponse(expectedSavePath);
 
       final savePath = await getSavePath(
         initialDirectory: initialDirectory,
@@ -155,32 +164,34 @@ void main() {
     });
 
     test('works with no arguments', () async {
-      when(mock.getSavePath())
-          .thenAnswer((_) => Future.value(expectedSavePath));
+      fakePlatformImplementation.setPathResponse(expectedSavePath);
 
       final savePath = await getSavePath();
       expect(savePath, expectedSavePath);
     });
 
     test('sets the initial directory', () async {
-      when(mock.getSavePath(initialDirectory: initialDirectory))
-          .thenAnswer((_) => Future.value(expectedSavePath));
+      fakePlatformImplementation
+        ..setExpectations(initialDirectory: initialDirectory)
+        ..setPathResponse(expectedSavePath);
 
       final savePath = await getSavePath(initialDirectory: initialDirectory);
       expect(savePath, expectedSavePath);
     });
 
     test('sets the button confirmation label', () async {
-      when(mock.getSavePath(confirmButtonText: confirmButtonText))
-          .thenAnswer((_) => Future.value(expectedSavePath));
+      fakePlatformImplementation
+        ..setExpectations(confirmButtonText: confirmButtonText)
+        ..setPathResponse(expectedSavePath);
 
       final savePath = await getSavePath(confirmButtonText: confirmButtonText);
       expect(savePath, expectedSavePath);
     });
 
     test('sets the accepted type groups', () async {
-      when(mock.getSavePath(acceptedTypeGroups: acceptedTypeGroups))
-          .thenAnswer((_) => Future.value(expectedSavePath));
+      fakePlatformImplementation
+        ..setExpectations(acceptedTypeGroups: acceptedTypeGroups)
+        ..setPathResponse(expectedSavePath);
 
       final savePath =
           await getSavePath(acceptedTypeGroups: acceptedTypeGroups);
@@ -188,8 +199,9 @@ void main() {
     });
 
     test('sets the suggested name', () async {
-      when(mock.getSavePath(suggestedName: suggestedName))
-          .thenAnswer((_) => Future.value(expectedSavePath));
+      fakePlatformImplementation
+        ..setExpectations(suggestedName: suggestedName)
+        ..setPathResponse(expectedSavePath);
 
       final savePath = await getSavePath(suggestedName: suggestedName);
       expect(savePath, expectedSavePath);
@@ -200,10 +212,11 @@ void main() {
     final expectedDirectoryPath = '/example/path';
 
     test('works', () async {
-      when(mock.getDirectoryPath(
-        initialDirectory: initialDirectory,
-        confirmButtonText: confirmButtonText,
-      )).thenAnswer((_) => Future.value(expectedDirectoryPath));
+      fakePlatformImplementation
+        ..setExpectations(
+            initialDirectory: initialDirectory,
+            confirmButtonText: confirmButtonText)
+        ..setPathResponse(expectedDirectoryPath);
 
       final directoryPath = await getDirectoryPath(
         initialDirectory: initialDirectory,
@@ -214,16 +227,16 @@ void main() {
     });
 
     test('works with no arguments', () async {
-      when(mock.getDirectoryPath())
-          .thenAnswer((_) => Future.value(expectedDirectoryPath));
+      fakePlatformImplementation.setPathResponse(expectedDirectoryPath);
 
       final directoryPath = await getDirectoryPath();
       expect(directoryPath, expectedDirectoryPath);
     });
 
     test('sets the initial directory', () async {
-      when(mock.getDirectoryPath(initialDirectory: initialDirectory))
-          .thenAnswer((_) => Future.value(expectedDirectoryPath));
+      fakePlatformImplementation
+        ..setExpectations(initialDirectory: initialDirectory)
+        ..setPathResponse(expectedDirectoryPath);
 
       final directoryPath =
           await getDirectoryPath(initialDirectory: initialDirectory);
@@ -231,8 +244,9 @@ void main() {
     });
 
     test('sets the button confirmation label', () async {
-      when(mock.getDirectoryPath(confirmButtonText: confirmButtonText))
-          .thenAnswer((_) => Future.value(expectedDirectoryPath));
+      fakePlatformImplementation
+        ..setExpectations(confirmButtonText: confirmButtonText)
+        ..setPathResponse(expectedDirectoryPath);
 
       final directoryPath =
           await getDirectoryPath(confirmButtonText: confirmButtonText);
@@ -241,6 +255,83 @@ void main() {
   });
 }
 
-class MockFileSelector extends Mock
+class FakeFileSelector extends Fake
     with MockPlatformInterfaceMixin
-    implements FileSelectorPlatform {}
+    implements FileSelectorPlatform {
+  // Expectations.
+  List<XTypeGroup>? acceptedTypeGroups = const <XTypeGroup>[];
+  String? initialDirectory;
+  String? confirmButtonText;
+  String? suggestedName;
+  // Return values.
+  List<XFile>? files;
+  String? path;
+
+  void setExpectations({
+    List<XTypeGroup> acceptedTypeGroups = const <XTypeGroup>[],
+    String? initialDirectory,
+    String? suggestedName,
+    String? confirmButtonText,
+  }) {
+    this.acceptedTypeGroups = acceptedTypeGroups;
+    this.initialDirectory = initialDirectory;
+    this.suggestedName = suggestedName;
+    this.confirmButtonText = confirmButtonText;
+  }
+
+  void setFileResponse(List<XFile> files) {
+    this.files = files;
+  }
+
+  void setPathResponse(String path) {
+    this.path = path;
+  }
+
+  @override
+  Future<XFile?> openFile({
+    List<XTypeGroup>? acceptedTypeGroups,
+    String? initialDirectory,
+    String? confirmButtonText,
+  }) async {
+    expect(acceptedTypeGroups, this.acceptedTypeGroups);
+    expect(initialDirectory, this.initialDirectory);
+    expect(suggestedName, this.suggestedName);
+    return files?[0];
+  }
+
+  @override
+  Future<List<XFile>> openFiles({
+    List<XTypeGroup>? acceptedTypeGroups,
+    String? initialDirectory,
+    String? confirmButtonText,
+  }) async {
+    expect(acceptedTypeGroups, this.acceptedTypeGroups);
+    expect(initialDirectory, this.initialDirectory);
+    expect(suggestedName, this.suggestedName);
+    return files!;
+  }
+
+  @override
+  Future<String?> getSavePath({
+    List<XTypeGroup>? acceptedTypeGroups,
+    String? initialDirectory,
+    String? suggestedName,
+    String? confirmButtonText,
+  }) async {
+    expect(acceptedTypeGroups, this.acceptedTypeGroups);
+    expect(initialDirectory, this.initialDirectory);
+    expect(suggestedName, this.suggestedName);
+    expect(confirmButtonText, this.confirmButtonText);
+    return path;
+  }
+
+  @override
+  Future<String?> getDirectoryPath({
+    String? initialDirectory,
+    String? confirmButtonText,
+  }) async {
+    expect(initialDirectory, this.initialDirectory);
+    expect(confirmButtonText, this.confirmButtonText);
+    return path;
+  }
+}