chore(dependencies): add webview_flutter_platform_interface package to pubspec.yaml and clean up test files by removing unnecessary whitespace

test/helpers/webview_test_helper.dart

@@ -0,0 +1,184 @@
+import 'package:flutter/material.dart';
+import 'package:webview_flutter_platform_interface/webview_flutter_platform_interface.dart';
+
+/// Helper class to set up WebViewPlatform for testing
+class WebViewTestHelper {
+  static FakeWebViewPlatform? _instance;
+
+  /// Sets up a fake WebViewPlatform instance for testing
+  static void setUpWebViewPlatform() {
+    _instance = FakeWebViewPlatform();
+    WebViewPlatform.instance = _instance!;
+  }
+
+  /// Cleans up the WebViewPlatform instance after testing
+  /// Note: We can't set WebViewPlatform.instance to null, so we just reset our reference
+  static void tearDownWebViewPlatform() {
+    _instance = null;
+    // Don't set WebViewPlatform.instance to null as it's not allowed
+  }
+}
+
+/// A fake implementation of WebViewPlatform for testing
+class FakeWebViewPlatform extends WebViewPlatform {
+  FakeWebViewPlatform() : super();
+
+  @override
+  PlatformWebViewController createPlatformWebViewController(
+    PlatformWebViewControllerCreationParams params,
+  ) {
+    return FakePlatformWebViewController._(params);
+  }
+
+  @override
+  PlatformWebViewWidget createPlatformWebViewWidget(
+    PlatformWebViewWidgetCreationParams params,
+  ) {
+    return FakePlatformWebViewWidget._(params);
+  }
+
+  @override
+  PlatformNavigationDelegate createPlatformNavigationDelegate(
+    PlatformNavigationDelegateCreationParams params,
+  ) {
+    return FakePlatformNavigationDelegate._(params);
+  }
+}
+
+/// A fake implementation of PlatformWebViewController for testing
+class FakePlatformWebViewController extends PlatformWebViewController {
+  FakePlatformWebViewController._(super.params)
+      : super.implementation();
+
+  // Implement the methods that are actually called in tests
+  // Using dynamic to avoid type issues with Params classes
+  @override
+  Future<void> setJavaScriptMode(dynamic params) async {
+    // No-op implementation for testing
+  }
+
+  Future<void> setNavigationDelegate(dynamic params) async {
+    // No-op implementation for testing
+  }
+
+  @override
+  Future<void> loadRequest(dynamic params) async {
+    // No-op implementation for testing
+  }
+
+  @override
+  Future<void> addJavaScriptChannel(dynamic params) async {
+    // No-op implementation for testing
+  }
+
+  @override
+  Future<void> removeJavaScriptChannel(dynamic params) async {
+    // No-op implementation for testing
+  }
+
+  @override
+  Future<void> setBackgroundColor(dynamic params) async {
+    // No-op implementation for testing
+  }
+
+  Future<void> setZoomEnabled(dynamic params) async {
+    // No-op implementation for testing
+  }
+
+  @override
+  Future<void> setUserAgent(dynamic params) async {
+    // No-op implementation for testing
+  }
+
+  @override
+  Future<String?> currentUrl() async => null;
+
+  @override
+  Future<String> getTitle() async => '';
+
+  @override
+  Future<bool> canGoBack() async => false;
+
+  @override
+  Future<bool> canGoForward() async => false;
+
+  @override
+  Future<void> goBack() async {}
+
+  @override
+  Future<void> goForward() async {}
+
+  @override
+  Future<void> reload() async {}
+
+  @override
+  Future<void> clearCache() async {}
+
+  @override
+  Future<void> clearLocalStorage() async {}
+
+  @override
+  Future<void> runJavaScript(dynamic params) async {}
+
+  @override
+  Future<Object> runJavaScriptReturningResult(dynamic params) async {
+    return '';
+  }
+
+  @override
+  Future<void> setOnConsoleMessage(dynamic params) async {}
+
+  @override
+  Future<void> setPlatformNavigationDelegate(dynamic delegate) async {
+    // No-op implementation for testing
+  }
+}
+
+/// A fake implementation of PlatformWebViewWidget for testing
+class FakePlatformWebViewWidget extends PlatformWebViewWidget {
+  FakePlatformWebViewWidget._(super.params)
+      : super.implementation();
+
+  @override
+  Widget build(BuildContext context) {
+    return const SizedBox.shrink();
+  }
+}
+
+/// A fake implementation of PlatformNavigationDelegate for testing
+class FakePlatformNavigationDelegate extends PlatformNavigationDelegate {
+  FakePlatformNavigationDelegate._(super.params)
+      : super.implementation();
+
+  @override
+  Future<void> setOnNavigationRequest(dynamic params) async {
+    // No-op implementation for testing
+  }
+
+  @override
+  Future<void> setOnPageStarted(dynamic params) async {
+    // No-op implementation for testing
+  }
+
+  @override
+  Future<void> setOnPageFinished(dynamic params) async {
+    // No-op implementation for testing
+  }
+
+  @override
+  Future<void> setOnWebResourceError(dynamic params) async {
+    // No-op implementation for testing
+  }
+
+  // Implement methods that might be called
+  @override
+  dynamic noSuchMethod(Invocation invocation) {
+    // Return empty futures for async methods
+    if (invocation.memberName.toString().contains('Future')) {
+      return Future.value();
+    }
+    // Return null for other methods
+    return null;
+  }
+}
+