[英]Jest is unable to detect the mock function call
我正在 Express 应用程序的 controller 上编写单元测试。 我是 mocking res.send
方法,并希望在用户传递这样的有效数据时调用它:
describe('>> CONTROLLERS -- Exercise -- deleteExercise', () => {
let res
beforeEach(() => {
res = {
send : jest.fn()
}
});
it('sends error as response if id was not passed', () => {
const req = {
body : {}
}
deleteExercise(req, res)
expect(res.send).toHaveBeenCalledWith({
error : 'please pass id field to delete the exercise.'
})
})
it('calls the deleteExercise class method if the id was passed', () => {
const req = {
body : {
id : 1234
}
}
deleteExercise(req, res)
expect(Exercise.deleteExercise).toHaveBeenCalledWith(1234)
expect(res.send).toHaveBeenCalled()
// expect(res.send).toHaveBeenCalledWith(mockData)
})
})
第一个测试运行良好,但第二个不是。 我已经添加了控制台来检查res.send
是否被调用,在代码中它被调用,但是 Jest 对expect(res.send).toHaveBeenCalled()
测试失败。 你能帮我解决我在这里缺少的东西吗......
在花了一些时间进行调试之后,我认为您还需要为您的模拟响应提供状态。
mockResponse = {
send : jest.fn()
status: jest.fn(() => mockResponse),
}
describe('>> CONTROLLERS -- Exercise -- deleteExercise', () => {
let mockResponse
beforeEach(() => {
mockResponse = {
send : jest.fn()
status: jest.fn(() => mockResponse),
}
});
afterEach(() => {
jest.clearAllMocks();
});
it('sends error as response if id was not passed', () => {
const mockRequest = {
body : {}
}
deleteExercise(mockRequest, mockResponse)
expect(mockResponse.send).toHaveBeenCalledWith({
error : 'please pass id field to delete the exercise.'
})
})
it('calls the deleteExercise class method if the id was passed', () => {
const mockRequest = {
body : {
id : 1234
}
}
deleteExercise(mockRequest, mockResponse)
// deleteExercise is called with req, res arguments
expect(Exercise.deleteExercise).toHaveBeenCalled()
expect(Exercise.deleteExercise).toHaveBeenCalledWith(mockRequest, mockResponse)
expect(Exercise.deleteExercise).toHaveBeenCalledTimes(1)
expect(mockResponse.send).toHaveBeenCalled()
expect(mockResponse.send).toHaveBeenCalledWith(1234)
expect(mockResponse.send).toHaveBeenCalledTimes(1)
})
})
deleteExercise
function 是用res
和req
调用的,而不是用id
调用的。 首先检查是否调用了 deleteExercise,然后检查是否调用了与 arguments 相同的 function。 然后稍后检查 function 被调用了多少次。
还有一件事,在每个测试用例之后清除所有模拟。
afterEach(() => {
jest.clearAllMocks();
});
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