chore: don't use custom test timeout for fixtures (#5221)

Author: wjhsf

packages/@lwc/engine-server/src/__tests__/fixtures.spec.ts

@@ -22,8 +22,6 @@ interface FixtureModule {
     features?: any[];
 }
 
-vi.setConfig({ testTimeout: 10_000 /* 10 seconds */ });
-
 vi.mock('lwc', async () => {
     const lwcEngineServer = await import('../index');
     try {

packages/@lwc/engine-server/src/__tests__/html-serialization.spec.ts

@@ -7,7 +7,7 @@
 
 import path from 'node:path';
 import vm from 'node:vm';
-import { vi, describe, it, expect } from 'vitest';
+import { describe, it, expect } from 'vitest';
 import { parseFragment, serialize } from 'parse5';
 import { rollup } from 'rollup';
 import replace from '@rollup/plugin-replace';
@@ -22,8 +22,6 @@ import type { RollupLog } from 'rollup';
  * robust than snapshots, which may have invalid/incorrect HTML.
  */
 
-vi.setConfig({ testTimeout: 10_000 /* 10 seconds */ });
-
 // Compile a component to an HTML string, using the full LWC compilation pipeline
 async function compileComponent(tagName: string, componentName: string) {
     const modulesDir = path.resolve(__dirname, './modules');

packages/@lwc/ssr-compiler/src/__tests__/fixtures.spec.ts

@@ -22,8 +22,6 @@ interface FixtureModule {
     features?: FeatureFlagName[];
 }
 
-vi.setConfig({ testTimeout: 10_000 /* 10 seconds */ });
-
 vi.mock('@lwc/ssr-runtime', async () => {
     const runtime = await import('@lwc/ssr-runtime');
     try {

vitest.shared.mjs

@@ -5,7 +5,10 @@ import pkg from './package.json';
 export default defineConfig({
     test: {
         // Don't time out if we detect a debugger attached
-        testTimeout: inspector.url() ? 2147483647 : undefined,
+        testTimeout: inspector.url()
+            ? // Largest allowed delay, see https://developer.mozilla.org/en-US/docs/Web/API/Window/setTimeout#maximum_delay_value
+              2147483647
+            : undefined,
         include: ['**/*.{test,spec}.{mjs,js,ts}'],
         snapshotFormat: {
             printBasicPrototype: true,