反应开玩笑的测试与酶误差

Question

试图用Jest和酶测试我的反应新应用，如下所示。

import 'react-native';
import React from 'react';
import renderer from 'react-test-renderer';
import { shallow } from 'enzyme';
import { SignUp } from '../../src/pages';
describe('Testing SignUp component', () => {
  it('renders as expected', () => {
    const wrapper = shallow(
        <SignUp />
     );
    expect(wrapper).toMatchSnapshot();
   });
});

在运行npm test时，我获得错误Cannot find module 'enzyme/build/ShallowTraversal' from 'shallow.js'

测试套件无法运行。

请注意，测试完成的负酶可以正确运行

test('SignUp Page renders correctly', () => {
    const tree = renderer.create(<SignUp />).toJSON();
    expect(tree).toMatchSnapshot();
});

可能是什么问题？

Answer 1

刚刚通过安装enzyme-to-json解决了问题；npm install --save-dev enzyme-to-json

在我的test_file.js

中导入的 toJson

import 'react-native';
import React from 'react';
import renderer from 'react-test-renderer';
import { shallow } from 'enzyme';
import toJson from 'enzyme-to-json'; //added this line

将测试更改为此

describe('Testing SignUp component', () => {
  it('renders as expected', () => {
    const wrapper = shallow(
      <SignUp />
    );
   expect(toJson(wrapper)).toMatchSnapshot(); //edited this line
 });
});

更改了package.json中的 snapShotSerializers

"preset": "react-native",
"collectCoverage": true,
"collectCoverageFrom": [
  "**/src/**.{js,jsx}"
],
"snapshotSerializers": ["enzyme-to-json/serializer"] //added this line

现在我的测试正常运行。