[英]How do I test the returned value in Jest?
I have a simple function that I want to test with Jest.我有一个简单的功能,我想用 Jest 进行测试。 I have read https://jestjs.io/docs/en/mock-functions many many times but I'm not sure whats going wrong and can't find a clear answer on stackoverflow.
我已经多次阅读https://jestjs.io/docs/en/mock-functions ,但我不确定出了什么问题,也无法在 stackoverflow 上找到明确的答案。 I feel like this is an extremely simple test.
我觉得这是一个非常简单的测试。
Here is my function:这是我的功能:
public hello(name: string) {
return 'Hello ' + name
}
Here is my Test:这是我的测试:
let hello = jest.fn()
jest.mock('./myfile.ts', () => {
return hello
})
beforeEach(() => {
hello('world')
})
describe('hello test', (){
it('expects to return concatenated string', () => {
expect(hello.mock.results[0].value).toBe('Hello world') // returns as undefined - Test fails
})
})
I keep getting undefined for the mock.results instead of 'Hello world'.我一直为 mock.results 而不是 'Hello world' 定义未定义。
What am I doing wrong?我究竟做错了什么? I feel like I'm overlooking something very simple.
我觉得我忽略了一些非常简单的事情。
You are trying to mock a function that you want to test.您正在尝试模拟要测试的函数。 You should only mock other dependencies.
您应该只模拟其他依赖项。
This is sufficient:这足够了:
expect(hello('world')).toBe('Hello world')
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