[webview_flutter] Adjust getTitle test (#4537)

The getTitle test has been flaking on iOS, for reasons that are not
clear. This is a highly speculative attempted fix, in case the issue is
that the future is completing too early (e.g., if 'about:blank' is
triggering a completion).
diff --git a/packages/webview_flutter/webview_flutter/CHANGELOG.md b/packages/webview_flutter/webview_flutter/CHANGELOG.md
index 2124032..5dd2ea0 100644
--- a/packages/webview_flutter/webview_flutter/CHANGELOG.md
+++ b/packages/webview_flutter/webview_flutter/CHANGELOG.md
@@ -1,6 +1,7 @@
 ## NEXT
 
 * Updates example app Android compileSdkVersion to 31.
+* Integration test fixes.
 
 ## 2.3.1
 
diff --git a/packages/webview_flutter/webview_flutter/example/integration_test/webview_flutter_test.dart b/packages/webview_flutter/webview_flutter/example/integration_test/webview_flutter_test.dart
index 0e7e345..3856150 100644
--- a/packages/webview_flutter/webview_flutter/example/integration_test/webview_flutter_test.dart
+++ b/packages/webview_flutter/webview_flutter/example/integration_test/webview_flutter_test.dart
@@ -748,19 +748,26 @@
     final Completer<WebViewController> controllerCompleter =
         Completer<WebViewController>();
 
+    final testUrl = 'data:text/html;charset=utf-8;base64,$getTitleTestBase64';
     await tester.pumpWidget(
       Directionality(
         textDirection: TextDirection.ltr,
         child: WebView(
-          initialUrl: 'data:text/html;charset=utf-8;base64,$getTitleTestBase64',
+          initialUrl: testUrl,
           onWebViewCreated: (WebViewController controller) {
             controllerCompleter.complete(controller);
           },
           onPageStarted: (String url) {
-            pageStarted.complete(null);
+            // Ensure that this update is for the test page, in case any other
+            // URL (e.g., about:blank) fires earlier notifications.
+            if (url == testUrl) {
+              pageStarted.complete(null);
+            }
           },
           onPageFinished: (String url) {
-            pageLoaded.complete(null);
+            if (url == testUrl) {
+              pageLoaded.complete(null);
+            }
           },
         ),
       ),
diff --git a/packages/webview_flutter/webview_flutter_wkwebview/CHANGELOG.md b/packages/webview_flutter/webview_flutter_wkwebview/CHANGELOG.md
index cbf1f04..3b78161 100644
--- a/packages/webview_flutter/webview_flutter_wkwebview/CHANGELOG.md
+++ b/packages/webview_flutter/webview_flutter_wkwebview/CHANGELOG.md
@@ -1,3 +1,7 @@
+## NEXT
+
+* Integration test fixes.
+
 ## 2.4.0
 
 * Implemented new `loadFile` and `loadHtmlString` methods from the platform interface.
diff --git a/packages/webview_flutter/webview_flutter_wkwebview/example/integration_test/webview_flutter_test.dart b/packages/webview_flutter/webview_flutter_wkwebview/example/integration_test/webview_flutter_test.dart
index 45a72d8..cd8c616 100644
--- a/packages/webview_flutter/webview_flutter_wkwebview/example/integration_test/webview_flutter_test.dart
+++ b/packages/webview_flutter/webview_flutter_wkwebview/example/integration_test/webview_flutter_test.dart
@@ -733,19 +733,26 @@
     final Completer<WebViewController> controllerCompleter =
         Completer<WebViewController>();
 
+    final testUrl = 'data:text/html;charset=utf-8;base64,$getTitleTestBase64';
     await tester.pumpWidget(
       Directionality(
         textDirection: TextDirection.ltr,
         child: WebView(
-          initialUrl: 'data:text/html;charset=utf-8;base64,$getTitleTestBase64',
+          initialUrl: testUrl,
           onWebViewCreated: (WebViewController controller) {
             controllerCompleter.complete(controller);
           },
           onPageStarted: (String url) {
-            pageStarted.complete(null);
+            // Ensure that this update is for the test page, in case any other
+            // URL (e.g., about:blank) fires earlier notifications.
+            if (url == testUrl) {
+              pageStarted.complete(null);
+            }
           },
           onPageFinished: (String url) {
-            pageLoaded.complete(null);
+            if (url == testUrl) {
+              pageLoaded.complete(null);
+            }
           },
         ),
       ),