Вы можете использовать jest.spyOn (object, methodName) , чтобы высмеивать Cookies.get
метод.
Например, main.js
:
import Cookies from 'js-cookie';
export function main(cookieName) {
const fullObjectStr = Cookies.get(cookieName);
console.log(fullObjectStr);
}
main.test.js
:
import { main } from './main';
import Cookies from 'js-cookie';
describe('61364508', () => {
it('should pass', () => {
const getSpy = jest.spyOn(Cookies, 'get').mockReturnValueOnce('123');
const cookieName = 'sid';
main(cookieName);
expect(getSpy).toBeCalledWith(cookieName);
getSpy.mockRestore();
});
});
результаты модульного теста:
PASS stackoverflow/61364508/main.test.js (14.388s)
61364508
✓ should pass (43ms)
console.log stackoverflow/61364508/main.js:5
123
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 0 total
Time: 16.256s
исходный код: https://github.com/mrdulin/react-apollo-graphql-starter-kit/tree/master/stackoverflow/61364508