Replace to testing-library from enzyme (mastodon#14152)

app/javascript/mastodon/components/__tests__/button-test.js

@@ -1,4 +1,4 @@
-import { shallow } from 'enzyme';
+import { render, fireEvent, screen } from '@testing-library/react';
 import React from 'react';
 import renderer from 'react-test-renderer';
 import Button from '../button';
@@ -21,16 +21,16 @@ describe('<Button />', () => {
 
   it('handles click events using the given handler', () => {
     const handler = jest.fn();
-    const button  = shallow(<Button onClick={handler} />);
-    button.find('button').simulate('click');
+    render(<Button onClick={handler}>button</Button>);
+    fireEvent.click(screen.getByText('button'));
 
     expect(handler.mock.calls.length).toEqual(1);
   });
 
   it('does not handle click events if props.disabled given', () => {
     const handler = jest.fn();
-    const button  = shallow(<Button onClick={handler} disabled />);
-    button.find('button').simulate('click');
+    render(<Button onClick={handler} disabled>button</Button>);
+    fireEvent.click(screen.getByText('button'));
 
     expect(handler.mock.calls.length).toEqual(0);
   });

app/javascript/mastodon/features/ui/components/__tests__/column-test.js

@@ -1,25 +1,24 @@
+import { render, fireEvent, screen } from '@testing-library/react';
 import React from 'react';
-import { mount } from 'enzyme';
 import Column from '../column';
-import ColumnHeader from '../column_header';
 
 describe('<Column />', () => {
   describe('<ColumnHeader /> click handler', () => {
     it('runs the scroll animation if the column contains scrollable content', () => {
-      const wrapper = mount(
+      const scrollToMock = jest.fn();
+      const { container } = render(
         <Column heading='notifications'>
           <div className='scrollable' />
         </Column>,
       );
-      const scrollToMock = jest.fn();
-      wrapper.find(Column).find('.scrollable').getDOMNode().scrollTo = scrollToMock;
-      wrapper.find(ColumnHeader).find('button').simulate('click');
+      container.querySelector('.scrollable').scrollTo = scrollToMock;
+      fireEvent.click(screen.getByText('notifications'));
       expect(scrollToMock).toHaveBeenCalledWith({ behavior: 'smooth', top: 0 });
     });
 
     it('does not try to scroll if there is no scrollable content', () => {
-      const wrapper = mount(<Column heading='notifications' />);
-      wrapper.find(ColumnHeader).find('button').simulate('click');
+      render(<Column heading='notifications' />);
+      fireEvent.click(screen.getByText('notifications'));
     });
   });
 });

app/javascript/mastodon/test_setup.js

@@ -1,5 +1 @@
-import { configure } from 'enzyme';
-import Adapter from 'enzyme-adapter-react-16';
-
-const adapter = new Adapter();
-configure({ adapter });
+import '@testing-library/jest-dom/extend-expect';

package.json

@@ -169,10 +169,10 @@
     "wicg-inert": "^3.0.3"
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^5.11.0",
+    "@testing-library/react": "^10.4.3",
     "babel-eslint": "^10.1.0",
     "babel-jest": "^25.2.4",
-    "enzyme": "^3.11.0",
-    "enzyme-adapter-react-16": "^1.15.2",
     "eslint": "^6.8.0",
     "eslint-plugin-import": "~2.21.2",
     "eslint-plugin-jsx-a11y": "~6.3.1",