diff --git a/packages/backend/test/misc/mock-resolver.ts b/packages/backend/test/misc/mock-resolver.ts
index f11097b986..d3302dc9bb 100644
--- a/packages/backend/test/misc/mock-resolver.ts
+++ b/packages/backend/test/misc/mock-resolver.ts
@@ -8,7 +8,7 @@ import type { ApDbResolverService } from '@/core/activitypub/ApDbResolverService
 import type { ApRendererService } from '@/core/activitypub/ApRendererService.js';
 import type { ApRequestService } from '@/core/activitypub/ApRequestService.js';
 import { Resolver } from '@/core/activitypub/ApResolverService.js';
-import type { IObject } from '@/core/activitypub/type.js';
+import type { IObject, IObjectWithId } from '@/core/activitypub/type.js';
 import type { HttpRequestService } from '@/core/HttpRequestService.js';
 import type { InstanceActorService } from '@/core/InstanceActorService.js';
 import type { LoggerService } from '@/core/LoggerService.js';
@@ -25,6 +25,7 @@ import type {
 } from '@/models/_.js';
 import { ApLogService } from '@/core/ApLogService.js';
 import { ApUtilityService } from '@/core/activitypub/ApUtilityService.js';
+import { fromTuple } from '@/misc/from-tuple.js';
 
 type MockResponse = {
 	type: string;
@@ -72,8 +73,11 @@ export class MockResolver extends Resolver {
 		return this.#remoteGetTrials;
 	}
 
+	public async resolve(value: string | [string]): Promise<IObjectWithId>;
+	public async resolve(value: string | IObject | [string | IObject]): Promise<IObject>;
 	@bindThis
-	public async resolve(value: string | IObject): Promise<IObject> {
+	public async resolve(value: string | IObject | [string | IObject]): Promise<IObject> {
+		value = fromTuple(value);
 		if (typeof value !== 'string') return value;
 
 		this.#remoteGetTrials.push(value);
diff --git a/packages/backend/test/unit/activitypub.ts b/packages/backend/test/unit/activitypub.ts
index 5767089109..456a476c16 100644
--- a/packages/backend/test/unit/activitypub.ts
+++ b/packages/backend/test/unit/activitypub.ts
@@ -2,6 +2,7 @@
  * SPDX-FileCopyrightText: syuilo and misskey-project
  * SPDX-License-Identifier: AGPL-3.0-only
  */
+
 process.env.NODE_ENV = 'test';
 
 import * as assert from 'assert';
@@ -27,6 +28,7 @@ import { DI } from '@/di-symbols.js';
 import { secureRndstr } from '@/misc/secure-rndstr.js';
 import { DownloadService } from '@/core/DownloadService.js';
 import { genAidx } from '@/misc/id/aidx.js';
+import { IdService } from '@/core/IdService.js';
 import { MockResolver } from '../misc/mock-resolver.js';
 import { UserKeypairService } from '@/core/UserKeypairService.js';
 import { MemoryKVCache, RedisKVCache } from '@/misc/cache.js';
diff --git a/packages/shared/eslint.config.js b/packages/shared/eslint.config.js
index be7a031b63..295829e374 100644
--- a/packages/shared/eslint.config.js
+++ b/packages/shared/eslint.config.js
@@ -41,6 +41,7 @@ export default [
 			'@typescript-eslint/prefer-nullish-coalescing': ['warn', {
 				ignorePrimitives: true,
 			}],
+			'no-param-reassign': 'off',
 		},
 	},
 ];