fix: Use mock of lodash.debounce (#15904)

* another try

* rm mock file

.gitignore

@@ -35,8 +35,8 @@ yarn.lock
 package-lock.json
 components/**/*.js
 components/**/*.jsx
-!components/**/__tests__/*.js
+!components/**/__tests__/**/*.js
-!components/**/__tests__/*.js.snap
+!components/**/__tests__/**/*.js.snap
 /.history
 # Docs templates
 site/theme/template/IconDisplay/*.js

components/tree/__tests__/directory.test.js

@@ -4,8 +4,9 @@ import Tree from '../index';
 
 const { DirectoryTree, TreeNode } = Tree;
 
+const mockDebounce = jest.mock('lodash/debounce', () => fn => fn);
+
 describe('Directory Tree', () => {
-  const mockDebounce = jest.mock('lodash/debounce', () => fn => fn);
   beforeAll(() => {
     jest.useFakeTimers();
   });