Improve slider's value indicator display test (#139198)

The previous test for #128137 does not effectively regress and verify #123313 because the issue is specific to desktop platforms.

dev/integration_tests/flutter_gallery/test/live_smoketest.dart

@@ -11,7 +11,7 @@
 import 'dart:async';
 
 import 'package:flutter/cupertino.dart';
-import 'package:flutter/gestures.dart' show kPrimaryButton;
+import 'package:flutter/gestures.dart' show PointerDeviceKind, kPrimaryButton;
 import 'package:flutter/material.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:flutter/services.dart';
@@ -137,13 +137,18 @@ class _LiveWidgetController extends LiveWidgetController {
     return finder;
   }
 
-  @override
-  Future<void> tap(FinderBase<Element> finder, { int? pointer, int buttons = kPrimaryButton, bool warnIfMissed = true }) async {
-    await super.tap(await _waitForElement(finder), pointer: pointer, buttons: buttons, warnIfMissed: warnIfMissed);
-  }
-
   Future<void> scrollIntoView(FinderBase<Element> finder, {required double alignment}) async {
     final FinderBase<Element> target = await _waitForElement(finder);
     await Scrollable.ensureVisible(target.evaluate().single, duration: const Duration(milliseconds: 100), alignment: alignment);
   }
+
+  @override
+  Future<void> tap(FinderBase<Element> finder, {
+    int? pointer,
+    int buttons = kPrimaryButton,
+    bool warnIfMissed = true,
+    PointerDeviceKind kind = PointerDeviceKind.touch,
+  }) async {
+    await super.tap(await _waitForElement(finder), pointer: pointer, buttons: buttons, warnIfMissed: warnIfMissed, kind: kind);
+  }
 }

packages/flutter/test/material/slider_test.dart

@@ -3432,7 +3432,7 @@ void main() {
     await gesture.up();
     await tester.pumpAndSettle();
     expect(value, isNot(equals(0.5)));
-    // The slider does not have have focus after the value is changed.
+    // The slider does not have focus after the value is changed.
     expect(focusNode.hasFocus, false);
   });
 
@@ -3618,8 +3618,8 @@ void main() {
     );
   }, variant: TargetPlatformVariant.desktop());
 
-  testWidgetsWithLeakTracking('Value indicator disappears after adjusting the slider', (WidgetTester tester) async {
-    // This is a regression test for https://github.com/flutter/flutter/issues/123313.
+  // Regression test for https://github.com/flutter/flutter/issues/123313, which only occurs on desktop platforms.
+  testWidgetsWithLeakTracking('Value indicator disappears after adjusting the slider on desktop', (WidgetTester tester) async {
     final ThemeData theme = ThemeData(useMaterial3: true);
     const double currentValue = 0.5;
     await tester.pumpWidget(MaterialApp(
@@ -3630,7 +3630,7 @@ void main() {
             value: currentValue,
             divisions: 5,
             label: currentValue.toStringAsFixed(1),
-            onChanged: (double value) {},
+            onChanged: (_) {},
           ),
         ),
       ),
@@ -3647,8 +3647,8 @@ void main() {
     final Offset sliderCenter = tester.getCenter(find.byType(Slider));
     final Offset tapLocation = Offset(sliderCenter.dx + 50, sliderCenter.dy);
 
-    // Tap the slider to bring up the value indicator.
-    await tester.tapAt(tapLocation);
+    // Tap the slider by mouse to bring up the value indicator.
+    await tester.tapAt(tapLocation, kind: PointerDeviceKind.mouse);
     await tester.pumpAndSettle();
 
     // Value indicator is visible.
@@ -3666,7 +3666,7 @@ void main() {
       valueIndicatorBox,
       isNot(paints..scale()..path(color: theme.colorScheme.primary)),
     );
-  });
+  }, variant: TargetPlatformVariant.desktop());
 
   testWidgetsWithLeakTracking('Value indicator remains when Slider is in focus on desktop', (WidgetTester tester) async {
     double value = 0.5;

packages/flutter_test/lib/src/controller.dart

@@ -987,14 +987,25 @@ abstract class WidgetController {
   /// For example, a test that verifies that tapping a disabled button does not
   /// trigger the button would set `warnIfMissed` to false, because the button
   /// would ignore the tap.
-  Future<void> tap(finders.FinderBase<Element> finder, {int? pointer, int buttons = kPrimaryButton, bool warnIfMissed = true}) {
-    return tapAt(getCenter(finder, warnIfMissed: warnIfMissed, callee: 'tap'), pointer: pointer, buttons: buttons);
+  Future<void> tap(
+    finders.FinderBase<Element> finder, {
+    int? pointer,
+    int buttons = kPrimaryButton,
+    bool warnIfMissed = true,
+    PointerDeviceKind kind = PointerDeviceKind.touch,
+  }) {
+    return tapAt(getCenter(finder, warnIfMissed: warnIfMissed, callee: 'tap'), pointer: pointer, buttons: buttons, kind: kind);
   }
 
   /// Dispatch a pointer down / pointer up sequence at the given location.
-  Future<void> tapAt(Offset location, {int? pointer, int buttons = kPrimaryButton}) {
+  Future<void> tapAt(
+    Offset location, {
+    int? pointer,
+    int buttons = kPrimaryButton,
+    PointerDeviceKind kind = PointerDeviceKind.touch,
+  }) {
     return TestAsyncUtils.guard<void>(() async {
-      final TestGesture gesture = await startGesture(location, pointer: pointer, buttons: buttons);
+      final TestGesture gesture = await startGesture(location, pointer: pointer, buttons: buttons, kind: kind);
       await gesture.up();
     });
   }
@@ -1012,9 +1023,20 @@ abstract class WidgetController {
   ///  * [tap], which presses and releases a pointer at the given location.
   ///  * [longPress], which presses and releases a pointer with a gap in
   ///    between long enough to trigger the long-press gesture.
-  Future<TestGesture> press(finders.FinderBase<Element> finder, {int? pointer, int buttons = kPrimaryButton, bool warnIfMissed = true}) {
+  Future<TestGesture> press(
+    finders.FinderBase<Element> finder, {
+    int? pointer,
+    int buttons = kPrimaryButton,
+    bool warnIfMissed = true,
+    PointerDeviceKind kind = PointerDeviceKind.touch,
+  }) {
     return TestAsyncUtils.guard<TestGesture>(() {
-      return startGesture(getCenter(finder, warnIfMissed: warnIfMissed, callee: 'press'), pointer: pointer, buttons: buttons);
+      return startGesture(
+        getCenter(finder, warnIfMissed: warnIfMissed, callee: 'press'),
+        pointer: pointer,
+        buttons: buttons,
+        kind: kind,
+      );
     });
   }
 
@@ -1030,15 +1052,31 @@ abstract class WidgetController {
   /// later verify that long-pressing the same location (using the same finder)
   /// has no effect (since the widget is now obscured), setting `warnIfMissed`
   /// to false on that second call.
-  Future<void> longPress(finders.FinderBase<Element> finder, {int? pointer, int buttons = kPrimaryButton, bool warnIfMissed = true}) {
-    return longPressAt(getCenter(finder, warnIfMissed: warnIfMissed, callee: 'longPress'), pointer: pointer, buttons: buttons);
+  Future<void> longPress(
+    finders.FinderBase<Element> finder, {
+    int? pointer,
+    int buttons = kPrimaryButton,
+    bool warnIfMissed = true,
+    PointerDeviceKind kind = PointerDeviceKind.touch,
+  }) {
+    return longPressAt(
+      getCenter(finder, warnIfMissed: warnIfMissed, callee: 'longPress'),
+      pointer: pointer,
+      buttons: buttons,
+      kind: kind,
+    );
   }
 
   /// Dispatch a pointer down / pointer up sequence at the given location with
   /// a delay of [kLongPressTimeout] + [kPressTimeout] between the two events.
-  Future<void> longPressAt(Offset location, {int? pointer, int buttons = kPrimaryButton}) {
+  Future<void> longPressAt(
+    Offset location, {
+    int? pointer,
+    int buttons = kPrimaryButton,
+    PointerDeviceKind kind = PointerDeviceKind.touch,
+  }) {
     return TestAsyncUtils.guard<void>(() async {
-      final TestGesture gesture = await startGesture(location, pointer: pointer, buttons: buttons);
+      final TestGesture gesture = await startGesture(location, pointer: pointer, buttons: buttons, kind: kind);
       await pump(kLongPressTimeout + kPressTimeout);
       await gesture.up();
     });