attempt to fix unit tests

packages/backend/test/setup.unit.ts

@@ -2,9 +2,11 @@
  * SPDX-FileCopyrightText: syuilo and misskey-project
  * SPDX-License-Identifier: AGPL-3.0-only
  */
+import { EventEmitter } from 'node:events';
 
 export default function setup() {
 	// DBはUTC（っぽい）ので、テスト側も合わせておく
 	process.env.TZ = 'UTC';
 	process.env.NODE_ENV = 'test';
+	EventEmitter.defaultMaxListeners = 20;
 }

packages/backend/test/unit/AnnouncementService.ts

@@ -199,7 +199,7 @@ describe('AnnouncementService', () => {
 		});
 	});
 
-	describe('read', () => {
+	describe.todo('read', () => {
 		// TODO
 	});
 });

packages/backend/test/unit/FetchInstanceMetadataService.ts

@@ -70,6 +70,8 @@ describe('FetchInstanceMetadataService', () => {
 
 	afterEach(async () => {
 		await app.close();
+		vi.resetAllMocks();
+		vi.clearAllMocks();
 	});
 
 	test('Lock and update', async () => {