我在代码中使用模块waait来执行以下操作:
import * as wait from 'waait';
await wait(500);
我创建了一个手动模拟:
module.exports = (() => {
return Promise.resolve();
});
然后我想在测试中拥有这样的断言:
import * as wait from 'waait';
expect(wait).toHaveBeenCalledTimes(1);
expect(wait).toHaveBeenLastCalledWith(1000);
当我运行它时,我得到:
expect(jest.fn())[.not].toHaveBeenCalledTimes()
jest.fn() value must be a mock function or spy.
Received: undefined
答案 0 :(得分:1)
您创建的手动模拟完全不是mock,而是fake(即替代实现)。
您甚至不需要它。您可以删除手动模拟并像这样编写测试:
import * as wait from 'waait';
jest.mock('waait');
wait.mockResolvedValue(undefined);
it('does something', () => {
// run the tested code here
// ...
// check the results against the expectations
expect(wait).toHaveBeenCalledTimes(1);
expect(wait).toHaveBeenLastCalledWith(1000);
});