mock a function jest react

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Rania
30 May 2019
1import React from 'react';
2import { render } from '@testing-library/react';
3import '@testing-library/jest-dom/extend-expect'
4import App from './App';
5
6import { randomNameGenerator } from "./utils";
7
8jest.mock('./utils.js', () => ({ 
9  randomNameGenerator: jest.fn()
10}));
11
12describe('test', () => {
13  it('allows Jest method mocking 1', () => {
14    randomNameGenerator.mockImplementation(() => "Craig");
15    const { getByText } = render(<App />);
16    expect(getByText("Craig")).toBeInTheDocument()
17  });
18
19  it('allows Jest method mocking 2', () => {
20    randomNameGenerator.mockImplementation(() => "Not Craig");
21    const { getByText } = render(<App />);
22    expect(getByText("Not Craig")).toBeInTheDocument()
23  });
24});
25
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