score:1
use jest.mock
mock the module. here is the working example:
util.js
:
import modulename from './third_party_module';
const util = {
simple_function() {
const name = modulename.func1();
}
};
export default util;
third_party_module.js
:
export default {
func1() {}
};
util.spec.js
:
import util from './util';
import modulename from './third_party_module';
jest.mock('./third_party_module', () => ({
func1: jest.fn()
}));
describe('was mocked functions called', () => {
test('was mocked functions called??', () => {
util.simple_function();
expect(modulename.func1).tohavebeencalled();
});
});
unit test result:
pass src/stackoverflow/54729837/util.spec.js (8.414s)
was mocked functions called
✓ was mocked functions called?? (4ms)
test suites: 1 passed, 1 total
tests: 1 passed, 1 total
snapshots: 0 total
time: 9.742s
source code: https://github.com/mrdulin/jest-codelab/tree/master/src/stackoverflow/54729837
Source: stackoverflow.com
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