feat: import Chinese-localized Buzz source snapshot

Signed-off-by: cls_宁波本机 <908705107@qq.com>

mobile/test/shared/emoji/emoji_burst_test.dart

@@ -0,0 +1,227 @@
+import 'package:buzz/shared/emoji/emoji_burst.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+
+const _fire = '\u{1F525}';
+
+/// Run the controller forward until it says it is done, capped so a physics
+/// regression fails the test instead of hanging it.
+int _runToCompletion(EmojiBurstController controller, {int maxSteps = 600}) {
+  var steps = 0;
+  while (controller.hasParticles && steps < maxSteps) {
+    controller.step();
+    steps += 1;
+  }
+  return steps;
+}
+
+void main() {
+  group('EmojiBurstController', () {
+    test('a burst spawns particles and eventually clears itself', () {
+      final controller = EmojiBurstController();
+      addTearDown(controller.dispose);
+
+      expect(controller.hasParticles, isFalse);
+      controller.burst(_fire, const Offset(100, 200));
+      expect(controller.hasParticles, isTrue);
+
+      final steps = _runToCompletion(controller);
+      expect(controller.hasParticles, isFalse);
+      // Desktop's particles live 108 frames and fade over the last 24%.
+      expect(steps, lessThanOrEqualTo(108));
+      expect(steps, greaterThan(60));
+    });
+
+    test('ignores a blank emoji', () {
+      final controller = EmojiBurstController();
+      addTearDown(controller.dispose);
+
+      controller.burst('   ', Offset.zero);
+      expect(controller.hasParticles, isFalse);
+    });
+
+    test('notifies on spawn and on every step', () {
+      final controller = EmojiBurstController();
+      addTearDown(controller.dispose);
+
+      var notifications = 0;
+      controller.addListener(() => notifications += 1);
+
+      controller.burst(_fire, Offset.zero);
+      expect(notifications, 1);
+
+      controller.step();
+      expect(notifications, 2);
+    });
+
+    test('calls onSpawn so the overlay can start its ticker', () {
+      final controller = EmojiBurstController();
+      addTearDown(controller.dispose);
+
+      var spawns = 0;
+      controller.onSpawn = () => spawns += 1;
+
+      controller.burst(_fire, Offset.zero);
+      controller.burst(_fire, Offset.zero);
+      expect(spawns, 2);
+    });
+
+    test('caps the active particle count', () {
+      final controller = EmojiBurstController();
+      addTearDown(controller.dispose);
+
+      // Far more bursts than the cap allows, with no steps in between so
+      // nothing expires.
+      for (var i = 0; i < 200; i += 1) {
+        controller.burst(_fire, Offset.zero);
+      }
+
+      // Still bounded, and still animating rather than wedged.
+      expect(controller.hasParticles, isTrue);
+      _runToCompletion(controller);
+      expect(controller.hasParticles, isFalse);
+    });
+
+    test('clear drops everything immediately', () {
+      final controller = EmojiBurstController();
+      addTearDown(controller.dispose);
+
+      controller.burst(_fire, Offset.zero);
+      controller.clear();
+      expect(controller.hasParticles, isFalse);
+    });
+  });
+
+  group('PendingReactionBurstNotifier', () {
+    ProviderContainer container() {
+      final result = ProviderContainer();
+      addTearDown(result.dispose);
+      return result;
+    }
+
+    test('arms only positive emoji', () {
+      final ref = container();
+      final notifier = ref.read(pendingReactionBurstProvider.notifier);
+
+      notifier.arm('msg-1', '\u{1F44E}'); // 👎
+      expect(ref.read(pendingReactionBurstProvider), isNull);
+
+      notifier.arm('msg-1', _fire);
+      expect(
+        ref.read(pendingReactionBurstProvider),
+        const PendingReactionBurst(messageId: 'msg-1', emoji: _fire),
+      );
+    });
+
+    test('claim succeeds once, so one pill bursts when a message is on screen '
+        'twice', () {
+      final ref = container();
+      final notifier = ref.read(pendingReactionBurstProvider.notifier);
+      const target = PendingReactionBurst(messageId: 'msg-1', emoji: _fire);
+
+      notifier.arm('msg-1', _fire);
+      expect(notifier.claim(target), isTrue);
+      expect(notifier.claim(target), isFalse);
+      expect(ref.read(pendingReactionBurstProvider), isNull);
+    });
+
+    test('a claim for a different message or emoji does not consume it', () {
+      final ref = container();
+      final notifier = ref.read(pendingReactionBurstProvider.notifier);
+
+      notifier.arm('msg-1', _fire);
+      expect(
+        notifier.claim(
+          const PendingReactionBurst(messageId: 'msg-2', emoji: _fire),
+        ),
+        isFalse,
+      );
+      expect(
+        notifier.claim(
+          const PendingReactionBurst(messageId: 'msg-1', emoji: '\u{1F389}'),
+        ),
+        isFalse,
+      );
+      expect(ref.read(pendingReactionBurstProvider), isNotNull);
+    });
+
+    test('a newer arm replaces the pending one', () {
+      final ref = container();
+      final notifier = ref.read(pendingReactionBurstProvider.notifier);
+
+      notifier.arm('msg-1', _fire);
+      notifier.arm('msg-2', '\u{1F389}');
+      expect(
+        ref.read(pendingReactionBurstProvider),
+        const PendingReactionBurst(messageId: 'msg-2', emoji: '\u{1F389}'),
+      );
+    });
+  });
+
+  group('EmojiBurstOverlay', () {
+    testWidgets('paints its child and drains the burst', (tester) async {
+      late EmojiBurstController controller;
+
+      await tester.pumpWidget(
+        ProviderScope(
+          child: MaterialApp(
+            home: Consumer(
+              builder: (context, ref, _) {
+                controller = ref.watch(emojiBurstControllerProvider);
+                return const EmojiBurstOverlay(child: Text('body'));
+              },
+            ),
+          ),
+        ),
+      );
+
+      expect(find.text('body'), findsOneWidget);
+
+      controller.burst(_fire, const Offset(120, 240));
+      expect(controller.hasParticles, isTrue);
+
+      // Physics advances a bounded number of fixed steps per frame (no
+      // catch-up spiral), so drain it a frame at a time — 130 frames is past
+      // the 108-frame particle life.
+      await tester.pump();
+      for (var frame = 0; frame < 130; frame += 1) {
+        await tester.pump(const Duration(milliseconds: 16));
+      }
+      expect(controller.hasParticles, isFalse);
+    });
+
+    testWidgets('the overlay never takes a tap from the app below', (
+      tester,
+    ) async {
+      var taps = 0;
+      late EmojiBurstController controller;
+
+      await tester.pumpWidget(
+        ProviderScope(
+          child: MaterialApp(
+            home: Consumer(
+              builder: (context, ref, _) {
+                controller = ref.watch(emojiBurstControllerProvider);
+                return EmojiBurstOverlay(
+                  child: Center(
+                    child: GestureDetector(
+                      onTap: () => taps += 1,
+                      child: const Text('tap me'),
+                    ),
+                  ),
+                );
+              },
+            ),
+          ),
+        ),
+      );
+
+      controller.burst(_fire, const Offset(200, 400));
+      await tester.pump();
+
+      await tester.tap(find.text('tap me'));
+      expect(taps, 1);
+    });
+  });
+}