Use ValueKey finder instead of text finder in keyboard_textfield_test (#97996)

Author: LongCatIsLooong

dev/integration_tests/ui/lib/keyboard_textfield.dart

@@ -55,16 +55,17 @@ class _MyHomePageState extends State<MyHomePage> {
 
   @override
   Widget build(BuildContext context) {
-    final String softKeyboardVisibility = MediaQuery.of(context).viewInsets.bottom > 100
-      ? 'keyboard visible'
-      : 'keyboard not visible';
+    final bool isSoftKeyboardVisible = MediaQuery.of(context).viewInsets.bottom > 100;
     return Scaffold(
       body: Column(
         children: <Widget>[
           Text('$offset',
             key: const ValueKey<String>(keys.kOffsetText),
           ),
-          Text(softKeyboardVisibility),
+          if (isSoftKeyboardVisible) const Text(
+            'keyboard visible',
+            key: ValueKey<String>(keys.kKeyboardVisibleView),
+          ),
           Expanded(
             child: ListView(
               key: const ValueKey<String>(keys.kListView),

dev/integration_tests/ui/lib/keys.dart

@@ -7,3 +7,4 @@ const String kHeightText = 'height_text';
 const String kUnfocusButton = 'unfocus_button';
 const String kOffsetText = 'offset_text';
 const String kListView = 'list_view';
+const String kKeyboardVisibleView = 'keyboard_visible';

dev/integration_tests/ui/test_driver/keyboard_textfield_test.dart

@@ -24,7 +24,7 @@ void main() {
       final SerializableFinder listViewFinder = find.byValueKey(keys.kListView);
       final SerializableFinder textFieldFinder = find.byValueKey(keys.kDefaultTextField);
       final SerializableFinder offsetFinder = find.byValueKey(keys.kOffsetText);
-      final SerializableFinder keyboardVisibilityIndicatorFinder = find.text('keyboard visible');
+      final SerializableFinder keyboardVisibilityIndicatorFinder = find.byValueKey(keys.kKeyboardVisibleView);
 
       // Align TextField with bottom edge to ensure it would be covered when keyboard comes up.
       await driver.waitForAbsent(textFieldFinder);