test: fix site test infinite loop in Jest --watch mode + simplify test

jest.config.mjs

@@ -32,15 +32,16 @@ const ignorePatterns = [
 export default {
   rootDir: fileURLToPath(new URL('.', import.meta.url)),
   verbose: true,
+  // Default 5s timeout often fails on Windows :s,
+  // see https://github.com/facebook/docusaurus/pull/8259
+  testTimeout: 15000,
   setupFiles: ['./jest/setup.js'],
   testEnvironmentOptions: {
     url: 'https://docusaurus.io/',
   },
   testEnvironment: 'node',
   testPathIgnorePatterns: ignorePatterns,
-  // Default 5s timeout often fails on Windows :s,
-  // see https://github.com/facebook/docusaurus/pull/8259
-  testTimeout: 15000,
+  watchPathIgnorePatterns: ['/\\.docusaurus'],
   coveragePathIgnorePatterns: [
     ...ignorePatterns,
     // We also ignore all package entry points

packages/docusaurus/src/server/__tests__/__snapshots__/site.test.ts.snap

@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`load loads props for site with custom i18n path 1`] = `
+exports[`load loads props for site 1`] = `
 {
   "baseUrl": "/",
   "codeTranslations": {},

packages/docusaurus/src/server/__tests__/site.test.ts

@@ -6,26 +6,22 @@
  */
 
 import path from 'path';
-import {mergeWithCustomize} from 'webpack-merge';
 import {loadSetup} from './testUtils';
-import type {Props} from '@docusaurus/types';
-import type {DeepPartial} from 'utility-types';
 
 describe('load', () => {
-  it('loads props for site with custom i18n path', async () => {
+  it('loads props for site', async () => {
     const site = await loadSetup('custom-i18n-site');
     expect(site.props).toMatchSnapshot();
-    const site2 = await loadSetup('custom-i18n-site', {locale: 'zh-Hans'});
-    expect(site2.props).toEqual(
-      mergeWithCustomize<DeepPartial<Props>>({
-        customizeArray(a, b, key) {
-          return ['routesPaths', 'plugins'].includes(key) ? b : undefined;
-        },
-      })(site.props, {
+  });
+
+  it('loads props for site - custom i18n path', async () => {
+    const site = await loadSetup('custom-i18n-site', {locale: 'zh-Hans'});
+    expect(site.props).toEqual(
+      expect.objectContaining({
         baseUrl: '/zh-Hans/',
-        i18n: {
+        i18n: expect.objectContaining({
           currentLocale: 'zh-Hans',
-        },
+        }),
         localizationDir: path.join(
           __dirname,
           '__fixtures__/custom-i18n-site/i18n/zh-Hans-custom',
@@ -35,14 +31,14 @@ describe('load', () => {
           '__fixtures__/custom-i18n-site/build/zh-Hans',
         ),
         routesPaths: ['/zh-Hans/404.html'],
-        siteConfig: {
+        siteConfig: expect.objectContaining({
           baseUrl: '/zh-Hans/',
-        },
+        }),
         siteStorage: {
           namespace: '',
           type: 'localStorage',
         },
-        plugins: site2.props.plugins,
+        plugins: site.props.plugins,
       }),
     );
   });