[file_selector_web] Migrated to null-safety (flutter#3550)

Co-authored-by: David Iglesias Teixeira <ditman@gmail.com>

Author: SirusCodes

packages/file_selector/file_selector_web/CHANGELOG.md

@@ -1,3 +1,7 @@
+# 0.8.0
+
+- Migrated to null-safety
+
 # 0.7.0+1
 
 - Add dummy `ios` dir, so flutter sdk can be lower than 1.20

packages/file_selector/file_selector_web/example/README.md

@@ -0,0 +1,21 @@
+# Testing
+
+This package utilizes the `integration_test` package to run its tests in a web browser.
+
+See [flutter.dev > Integration testing](https://flutter.dev/docs/testing/integration-tests) for more info.
+
+## Running the tests
+
+Make sure you have updated to the latest Flutter master.
+
+1. Check what version of Chrome is running on the machine you're running tests on.
+
+2. Download and install driver for that version from here:
+    * <https://chromedriver.chromium.org/downloads>
+
+3. Start the driver using `chromedriver --port=4444`
+
+4. Run tests: `flutter drive -d web-server --browser-name=chrome --driver=test_driver/integration_test.dart --target=integration_test/TEST_NAME.dart`, or (in Linux):
+
+    * Single: `./run_test.sh integration_test/TEST_NAME.dart`
+    * All: `./run_test.sh`

packages/file_selector/file_selector_web/integration_test/dom_helper_test.dart renamed to packages/file_selector/file_selector_web/example/integration_test/dom_helper_test.dart

@@ -2,28 +2,26 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.9
-
 import 'dart:html';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:integration_test/integration_test.dart';
 import 'package:file_selector_web/src/dom_helper.dart';
 import 'package:file_selector_platform_interface/file_selector_platform_interface.dart';
 
 void main() {
-  group('FileSelectorWeb', () {
+  group('dom_helper', () {
     IntegrationTestWidgetsFlutterBinding.ensureInitialized();
-    DomHelper domHelper;
-    FileUploadInputElement input;
+    late DomHelper domHelper;
+    late FileUploadInputElement input;
 
-    FileList FileListItems(List<File> files) {
+    FileList? createFileList(List<File> files) {
       final dataTransfer = DataTransfer();
-      files.forEach(dataTransfer.items.add);
-      return dataTransfer.files;
+      files.forEach(dataTransfer.items!.add);
+      return dataTransfer.files as FileList?;
     }
 
     void setFilesAndTriggerChange(List<File> files) {
-      input.files = FileListItems(files);
+      input.files = createFileList(files);
       input.dispatchEvent(Event('change'));
     }
 

packages/file_selector/file_selector_web/integration_test/file_selector_web_test.dart renamed to packages/file_selector/file_selector_web/example/integration_test/file_selector_web_test.dart

@@ -2,11 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.9
-
+import 'dart:html';
 import 'dart:typed_data';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:mockito/mockito.dart';
 import 'package:integration_test/integration_test.dart';
 import 'package:file_selector_platform_interface/file_selector_platform_interface.dart';
 import 'package:file_selector_web/file_selector_web.dart';
@@ -15,30 +13,25 @@ import 'package:file_selector_web/src/dom_helper.dart';
 void main() {
   group('FileSelectorWeb', () {
     IntegrationTestWidgetsFlutterBinding.ensureInitialized();
-    MockDomHelper mockDomHelper;
-    FileSelectorWeb plugin;
-
-    setUp(() {
-      mockDomHelper = MockDomHelper();
-      plugin = FileSelectorWeb(domHelper: mockDomHelper);
-    });
 
     group('openFile', () {
-      final mockFile = createXFile('1001', 'identity.png');
-
       testWidgets('works', (WidgetTester _) async {
+        final mockFile = createXFile('1001', 'identity.png');
+
+        final mockDomHelper = MockDomHelper()
+          ..setFiles([mockFile])
+          ..expectAccept('.jpg,.jpeg,image/png,image/*')
+          ..expectMultiple(false);
+
+        final plugin = FileSelectorWeb(domHelper: mockDomHelper);
+
         final typeGroup = XTypeGroup(
           label: 'images',
           extensions: ['jpg', 'jpeg'],
           mimeTypes: ['image/png'],
           webWildCards: ['image/*'],
         );
 
-        when(mockDomHelper.getFiles(
-          accept: '.jpg,.jpeg,image/png,image/*',
-          multiple: false,
-        )).thenAnswer((_) async => [mockFile]);
-
         final file = await plugin.openFile(acceptedTypeGroups: [typeGroup]);
 
         expect(file.name, mockFile.name);
@@ -49,20 +42,22 @@ void main() {
     });
 
     group('openFiles', () {
-      final mockFile1 = createXFile('123456', 'file1.txt');
-      final mockFile2 = createXFile('', 'file2.txt');
-
       testWidgets('works', (WidgetTester _) async {
+        final mockFile1 = createXFile('123456', 'file1.txt');
+        final mockFile2 = createXFile('', 'file2.txt');
+
+        final mockDomHelper = MockDomHelper()
+          ..setFiles([mockFile1, mockFile2])
+          ..expectAccept('.txt')
+          ..expectMultiple(true);
+
+        final plugin = FileSelectorWeb(domHelper: mockDomHelper);
+
         final typeGroup = XTypeGroup(
           label: 'files',
           extensions: ['.txt'],
         );
 
-        when(mockDomHelper.getFiles(
-          accept: '.txt',
-          multiple: true,
-        )).thenAnswer((_) async => [mockFile1, mockFile2]);
-
         final files = await plugin.openFiles(acceptedTypeGroups: [typeGroup]);
 
         expect(files.length, 2);
@@ -81,7 +76,36 @@ void main() {
   });
 }
 
-class MockDomHelper extends Mock implements DomHelper {}
+class MockDomHelper implements DomHelper {
+  List<XFile> _files = <XFile>[];
+  String _expectedAccept = '';
+  bool _expectedMultiple = false;
+
+  @override
+  Future<List<XFile>> getFiles({
+    String accept = '',
+    bool multiple = false,
+    FileUploadInputElement? input,
+  }) {
+    expect(accept, _expectedAccept,
+        reason: 'Expected "accept" value does not match.');
+    expect(multiple, _expectedMultiple,
+        reason: 'Expected "multiple" value does not match.');
+    return Future.value(_files);
+  }
+
+  void setFiles(List<XFile> files) {
+    _files = files;
+  }
+
+  void expectAccept(String accept) {
+    _expectedAccept = accept;
+  }
+
+  void expectMultiple(bool multiple) {
+    _expectedMultiple = multiple;
+  }
+}
 
 XFile createXFile(String content, String name) {
   final data = Uint8List.fromList(content.codeUnits);

packages/file_selector/file_selector_web/example/lib/main.dart

@@ -0,0 +1,25 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+void main() {
+  runApp(MyApp());
+}
+
+/// App for testing
+class MyApp extends StatefulWidget {
+  @override
+  _MyAppState createState() => _MyAppState();
+}
+
+class _MyAppState extends State<MyApp> {
+  @override
+  Widget build(BuildContext context) {
+    return Directionality(
+      textDirection: TextDirection.ltr,
+      child: Text('Testing... Look at the console output for results!'),
+    );
+  }
+}

packages/file_selector/file_selector_web/example/pubspec.yaml

@@ -0,0 +1,21 @@
+name: file_selector_web_integration_tests
+publish_to: none
+
+dependencies:
+  flutter:
+    sdk: flutter
+
+dev_dependencies:
+  build_runner: ^1.10.0
+  file_selector_web:
+    path: ../
+  flutter_driver:
+    sdk: flutter
+  flutter_test:
+    sdk: flutter
+  integration_test:
+    sdk: flutter
+
+environment:
+  sdk: ">=2.12.0-259.9.beta <3.0.0"
+  flutter: ">=1.27.0-0" # For integration_test from sdk

packages/file_selector/file_selector_web/run_integration_test renamed to packages/file_selector/file_selector_web/example/run_test.sh

@@ -0,0 +1,12 @@
+<!doctype html>
+<!-- Copyright 2014 The Flutter Authors. All rights reserved.
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file. -->
+<html>
+    <head>
+        <title>Browser Tests</title>
+    </head>
+    <body>
+        <script src="main.dart.js"></script>
+    </body>
+</html>

packages/file_selector/file_selector_web/test_driver/integration_test.dart renamed to packages/file_selector/file_selector_web/example/test_driver/integration_test.dart

@@ -13,7 +13,7 @@ import 'package:file_selector_web/src/utils.dart';
 ///
 /// This class implements the `package:file_selector` functionality for the web.
 class FileSelectorWeb extends FileSelectorPlatform {
-  final _domHelper;
+  final DomHelper _domHelper;
 
   /// Registers this class as the default instance of [FileSelectorPlatform].
   static void registerWith(Registrar registrar) {
@@ -23,46 +23,46 @@ class FileSelectorWeb extends FileSelectorPlatform {
   /// Default constructor, initializes _domHelper that we can use
   /// to interact with the DOM.
   /// overrides parameter allows for testing to override functions
-  FileSelectorWeb({@visibleForTesting DomHelper domHelper})
+  FileSelectorWeb({@visibleForTesting DomHelper? domHelper})
       : _domHelper = domHelper ?? DomHelper();
 
   @override
   Future<XFile> openFile({
-    List<XTypeGroup> acceptedTypeGroups,
-    String initialDirectory,
-    String confirmButtonText,
+    List<XTypeGroup>? acceptedTypeGroups,
+    String? initialDirectory,
+    String? confirmButtonText,
   }) async {
     final files = await _openFiles(acceptedTypeGroups: acceptedTypeGroups);
     return files.first;
   }
 
   @override
   Future<List<XFile>> openFiles({
-    List<XTypeGroup> acceptedTypeGroups,
-    String initialDirectory,
-    String confirmButtonText,
+    List<XTypeGroup>? acceptedTypeGroups,
+    String? initialDirectory,
+    String? confirmButtonText,
   }) async {
     return _openFiles(acceptedTypeGroups: acceptedTypeGroups, multiple: true);
   }
 
   @override
-  Future<String> getSavePath({
-    List<XTypeGroup> acceptedTypeGroups,
-    String initialDirectory,
-    String suggestedName,
-    String confirmButtonText,
+  Future<String?> getSavePath({
+    List<XTypeGroup>? acceptedTypeGroups,
+    String? initialDirectory,
+    String? suggestedName,
+    String? confirmButtonText,
   }) async =>
       null;
 
   @override
-  Future<String> getDirectoryPath({
-    String initialDirectory,
-    String confirmButtonText,
+  Future<String?> getDirectoryPath({
+    String? initialDirectory,
+    String? confirmButtonText,
   }) async =>
       null;
 
   Future<List<XFile>> _openFiles({
-    List<XTypeGroup> acceptedTypeGroups,
+    List<XTypeGroup>? acceptedTypeGroups,
     bool multiple = false,
   }) async {
     final accept = acceptedTypesToString(acceptedTypeGroups);