chore(test): the createFileWatcher test sometimes timeout (#3732)

Author: chenjiahan

packages/cli/core/tests/createFileWatcher.test.ts

@@ -1,10 +1,9 @@
 import * as path from 'path';
-import { fs, wait } from '@modern-js/utils';
+import { wait } from '@modern-js/utils';
 import { createFileWatcher } from '../src/utils';
 import { IAppContext } from '../src';
 
 const mockAppDirectory = path.join(__dirname, './fixtures/index-test');
-const mockSrcDirectory = path.join(mockAppDirectory, './src');
 
 describe('createFileWatcher', () => {
   const argv = process.argv.slice(0);
@@ -15,53 +14,46 @@ describe('createFileWatcher', () => {
   });
 
   afterAll(() => {
-    const file = path.join(mockSrcDirectory, './index.ts');
-    if (fs.existsSync(file)) {
-      fs.unlinkSync(file);
-    }
     process.argv = argv;
   });
 
   it('will trigger add event', async () => {
     let triggeredType = '';
     let triggeredFile = '';
+
     const appContext: IAppContext = {
       appDirectory: '',
       distDirectory: '',
       packageName: '',
       serverConfigFile: '',
       configFile: '',
     } as IAppContext;
+
     const hooksRunner = {
-      watchFiles: async () => [mockSrcDirectory],
+      watchFiles: async () => [mockAppDirectory],
       fileChange: jest.fn(({ filename, eventType }) => {
         triggeredType = eventType;
         triggeredFile = filename;
       }),
     };
 
-    if (await fs.pathExists(mockSrcDirectory)) {
-      await fs.remove(mockSrcDirectory);
-    }
-
     const watcher = await createFileWatcher(
       appContext as any,
       hooksRunner as any,
     );
     await wait(100);
 
-    const file = path.join(mockSrcDirectory, './index.ts');
-    await fs.outputFile(file, '');
-    await wait(500);
-    // expect(hooksRunner.fileChange).toBeCalledTimes(1);
-    // expect(triggeredType).toBe('add');
+    // Add a file
+    const file = path.join(mockAppDirectory, './package.json');
+    watcher?.emit('add', file);
+    expect(triggeredType).toBe('add');
+    expect(hooksRunner.fileChange).toBeCalledTimes(1);
     expect(file.includes(triggeredFile)).toBeTruthy();
 
-    await wait(100);
-    await fs.remove(file);
-    await wait(2000);
-    expect(hooksRunner.fileChange).toBeCalledTimes(2);
+    // Remove a file
+    watcher?.emit('unlink', file);
     expect(triggeredType).toBe('unlink');
+    expect(hooksRunner.fileChange).toBeCalledTimes(2);
     expect(file.includes(triggeredFile)).toBeTruthy();
 
     watcher?.close();