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+// 观看计费响应模型解析单测（《03-接口文档》5.3 cost_type 0/1/2/3）
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:video_app/models/watch_result.dart';
+
+void main() {
+  group('WatchResult.fromJson', () {
+    test('cost_type=0 占用免费额度', () {
+      final r = WatchResult.fromJson(const {
+        'cost_type': 0,
+        'cost_points': 0,
+        'remaining_points': 86,
+        'free_remaining_today': 7,
+      });
+      expect(r.costType, 0);
+      expect(r.isPointsCost, isFalse);
+      expect(r.freeRemainingToday, 7);
+      expect(r.remainingPoints, 86);
+    });
+
+    test('cost_type=1 积分扣减，isPointsCost 为 true', () {
+      final r = WatchResult.fromJson(const {
+        'cost_type': 1,
+        'cost_points': 1,
+        'remaining_points': 85,
+        'free_remaining_today': 0,
+      });
+      expect(r.isPointsCost, isTrue);
+      expect(r.costPoints, 1);
+      expect(r.remainingPoints, 85);
+    });
+
+    test('cost_type=2 会员免费', () {
+      final r = WatchResult.fromJson(const {
+        'cost_type': 2,
+        'cost_points': 0,
+        'remaining_points': 86,
+        'free_remaining_today': 10,
+      });
+      expect(r.isPointsCost, isFalse);
+    });
+
+    test('cost_type=3 重复观看或本人作品', () {
+      final r = WatchResult.fromJson(const {
+        'cost_type': 3,
+        'cost_points': 0,
+        'remaining_points': 86,
+        'free_remaining_today': 10,
+      });
+      expect(r.isPointsCost, isFalse);
+    });
+
+    test('字段缺失时按 0 兜底', () {
+      final r = WatchResult.fromJson(const {});
+      expect(r.costType, 0);
+      expect(r.costPoints, 0);
+      expect(r.remainingPoints, 0);
+      expect(r.freeRemainingToday, 0);
+    });
+  });
+}