Test case for warning message of importing all components (#9814)

* Add test case

* fix test case

components/__tests__/index.test.js

@@ -1,7 +1,15 @@
-import * as antd from '..';
+const warnSpy = jest.spyOn(console, 'warn').mockImplementation(() => {});
+const antd = require('..');
 
 describe('antd', () => {
   it('exports modules correctly', () => {
     expect(Object.keys(antd)).toMatchSnapshot();
   });
+
+  it('should hint when import all components', () => {
+    expect(warnSpy).toBeCalledWith(
+      'You are using a whole package of antd, please use https://www.npmjs.com/package/babel-plugin-import to reduce app bundle size.'
+    );
+    warnSpy.mockRestore();
+  });
 });

components/index.tsx

@@ -2,7 +2,6 @@
 // this file is not used if use https://github.com/ant-design/babel-plugin-import
 const ENV = process.env.NODE_ENV;
 if (ENV !== 'production' &&
-    ENV !== 'test' &&
     typeof console !== 'undefined' &&
     console.warn &&
     typeof window !== 'undefined') {