test: 修正 mock 的滥用情况

packages/builtin-tools/src/tools/LSPTool/__tests__/formatters.test.ts

@@ -1,19 +1,10 @@
 import { mock, describe, expect, test } from "bun:test";
 
-mock.module("src/utils/debug.js", () => ({
+mock.module("src/utils/debug.ts", () => ({
   logForDebugging: () => {},
   isDebugMode: () => false,
 }));
 
-mock.module("src/utils/errors.js", () => ({
-  errorMessage: (e: unknown) => String(e),
-}));
-
-mock.module("src/utils/stringUtils.js", () => ({
-  plural: (n: number, singular: string, plural?: string) =>
-    n === 1 ? singular : (plural ?? singular + "s"),
-}));
-
 const {
   formatGoToDefinitionResult,
   formatFindReferencesResult,