Вы можете использовать jest.spyOn (object, methodName) для макетирования firebase.firestore()
функции.
Например index.jsx
:
import React, { Component } from 'react';
import firebase from 'firebase';
export default class MyComponent extends Component {
constructor(props) {
super(props);
this.state = {
field: { email: 'fuck@qq.com' },
};
}
clearFields(statusMsg) {
console.log(statusMsg);
}
saveToFirebase = () => {
let statusMsg = '';
return firebase
.firestore()
.collection('messages')
.doc(this.state.field.email)
.set(this.state.field)
.then(() => {
statusMsg = 'Your Message have been submitted successfully.';
this.clearFields(statusMsg);
});
};
render() {
return <div>my component</div>;
}
}
index.test.jsx
:
import MyComponent from '.';
import { shallow } from 'enzyme';
import React from 'react';
import firebase from 'firebase';
describe('61358076', () => {
afterEach(() => {
jest.restoreAllMocks();
});
it('should pass', async () => {
const firestoreMock = {
collection: jest.fn().mockReturnThis(),
doc: jest.fn().mockReturnThis(),
set: jest.fn().mockResolvedValueOnce(),
};
const clearFieldsSpy = jest.spyOn(MyComponent.prototype, 'clearFields');
jest.spyOn(firebase, 'firestore').mockImplementationOnce(() => firestoreMock);
const wrapper = shallow(<MyComponent></MyComponent>);
await wrapper.instance().saveToFirebase();
expect(firestoreMock.collection).toBeCalledWith('messages');
expect(firestoreMock.doc).toBeCalledWith('fuck@qq.com');
expect(firestoreMock.set).toBeCalledWith({ email: 'fuck@qq.com' });
expect(clearFieldsSpy).toBeCalledWith('Your Message have been submitted successfully.');
});
});
результаты модульного тестирования со 100% покрытием:
PASS stackoverflow/61358076/index.test.jsx (17.824s)
61358076
✓ should pass (39ms)
console.log stackoverflow/61358076/index.jsx:1611
Your Message have been submitted successfully.
-----------|---------|----------|---------|---------|-------------------
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
-----------|---------|----------|---------|---------|-------------------
All files | 100 | 100 | 100 | 100 |
index.jsx | 100 | 100 | 100 | 100 |
-----------|---------|----------|---------|---------|-------------------
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 0 total
Time: 19.945s
исходный код: https://github.com/mrdulin/react-apollo-graphql-starter-kit/tree/master/stackoverflow/61358076