test(player): 增加飘心像素定位回归

test/player/player_hearts_pixels_test.dart

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+// Author: fruit.com.cn
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:fruitshorts/pages/player/widgets/player_double_tap_hearts.dart';
+
+void main() {
+  testWidgets('heart pixels start at origin and move upward', (tester) async {
+    tester.view.physicalSize = const Size(400, 800);
+    tester.view.devicePixelRatio = 1;
+    addTearDown(tester.view.resetPhysicalSize);
+    addTearDown(tester.view.resetDevicePixelRatio);
+
+    var completedCalls = 0;
+    const origin = Offset(300, 546);
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(
+          body: Stack(
+            fit: StackFit.expand,
+            clipBehavior: Clip.none,
+            children: [
+              Positioned.fill(
+                child: PlayerDoubleTapHeartBurst(
+                  burstId: 91,
+                  origin: origin,
+                  onCompleted: () => completedCalls++,
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+
+    final firstHeart = find.byKey(const Key('double-tap-heart-0'));
+    expect(firstHeart, findsOneWidget);
+    final firstSize = tester.getSize(firstHeart);
+    final initialCenter = tester.getCenter(firstHeart);
+    debugPrint(
+      '[heart-pixels] initial size=${firstSize.width}x${firstSize.height} '
+      'center=${initialCenter.dx},${initialCenter.dy}',
+    );
+    expect(firstSize.width, closeTo(48, 1));
+    expect(firstSize.height, closeTo(48, 1));
+    expect(firstSize.width, greaterThan(20));
+    expect((initialCenter - origin).distance, lessThanOrEqualTo(1));
+    expect(
+      (tester.getTopLeft(find.byKey(const Key('heart-burst-elapsed-debug'))) -
+              const Offset(308, 556))
+          .distance,
+      lessThanOrEqualTo(1),
+    );
+
+    await tester.pump(const Duration(milliseconds: 400));
+    final midpoint = tester.getCenter(firstHeart);
+    debugPrint(
+      '[heart-pixels] after400ms center=${midpoint.dx},${midpoint.dy}',
+    );
+    expect(midpoint.dy, lessThan(origin.dy - 40));
+    expect((midpoint.dx - origin.dx).abs(), lessThanOrEqualTo(30));
+
+    await tester.pump(const Duration(milliseconds: 1200));
+    expect(completedCalls, 1);
+  });
+}