first commit

src/modules/follows/follows.service.spec.ts

@@ -0,0 +1,42 @@
+import { FollowsService } from './follows.service';
+
+describe('FollowsService', () => {
+  it('keeps follow successful even if notification creation fails and resyncs counters', async () => {
+    const currentUserId = '507f1f77bcf86cd799439011';
+    const targetUserId = '507f191e810c19729de860ea';
+
+    const followsRepository = {
+      findOne: jest.fn().mockResolvedValue(null),
+      create: jest.fn().mockResolvedValue({ id: 'follow-1' }),
+      count: jest
+        .fn()
+        .mockResolvedValueOnce(6)
+        .mockResolvedValueOnce(14),
+    };
+    const usersRepository = {
+      findById: jest.fn().mockResolvedValue({ id: targetUserId }),
+      setFollowingCount: jest.fn().mockResolvedValue(undefined),
+      setFollowersCount: jest.fn().mockResolvedValue(undefined),
+    };
+    const outboxService = {
+      enqueueFollowNotification: jest.fn().mockRejectedValue(new Error('socket down')),
+    };
+
+    const service = new FollowsService(
+      followsRepository as any,
+      usersRepository as any,
+      outboxService as any,
+    );
+
+    await expect(service.toggleFollow(currentUserId, { targetUserId })).resolves.toEqual({
+      following: true,
+    });
+    expect(usersRepository.setFollowingCount).toHaveBeenCalledWith(currentUserId, 6);
+    expect(usersRepository.setFollowersCount).toHaveBeenCalledWith(targetUserId, 14);
+    expect(outboxService.enqueueFollowNotification).toHaveBeenCalledWith(
+      currentUserId,
+      targetUserId,
+      'follow-1',
+    );
+  });
+});