Question

我有以下假设情景：

instance.myFunc

我需要使用Jest创建一个测试，确保调用(define play-asynchronously #f) (define sound-test #t) (define (sound-test!) (if sound-test #f #t)) (define (in-game-loop) (if sound-test (if (play-sound "flight_of_the_bumblebee.mp3" play-asynchronously) ;Geschreven in 1899-1900 door Nikolaj Rimski-Korsakov ;Gedownload op 16/05/2018 van https://ia802606.us.archive.org/19/items/FlightOfTheBumblebee/flight_of_the_bumblebee_2.mp3 (in-game-loop) 'done) (begin (in-menu-loop) (set! sound-test #t)))) (define (in-menu-loop) (if sound-test (if (play-sound "Gymnopedie-No-1.mp3" play-asynchronously) ;Geschreven in 1888 door Erik Satie ;Gedownload op 16/05/018 van https://incompetech.com/music/royalty-free/?keywords=gymnopedie (in-menu-loop) 'done) (begin (in-game-loop) (set! sound-test #t))))

Answer 1

其中一个选项是用模拟实现替换MyClass模块

it("Test myfunc called in functionToBeTested", () => {
  functionToBeTested()
  expect(mockmyfunc).toHaveBeenCalled()
})

然后写下面的测试

export class MyClass {
    myFunc() {
      // do smth
    }
}

请注意，这不是唯一的方法，您可以深入了解https://facebook.github.io/jest/docs/en/es6-class-mocks.html以寻找其他选择。

更新

如果myfunc是一个实际的函数（我猜它不是一个选项，因为它是外部包？）

import MyClass from "path/to/external/package/MyClass"
jest.mock("path/to/external/package/MyClass")

it("Test myfunc called in functionToBeTested", () => {
  functionToBeTested()
  const mockMyFunc = MyClass.mock.instances[0].myFunc
  expect(mockMyFunc).toHaveBeenCalled()
})

你不需要替换实现，你可以使用jest的automock

function checkForMatch() {
  if ( $(openedCardsList[0]).is(openedCardsList[1]) ) {
  $(openedCardsList[0]).removeClass('open show').addClass('match');
  $(openedCardsList[1]).toggleClass('open show');
  $(openedCardsList[1]).toggleClass('match');
  $(openedCardsList) = [];
  }

  else {unFlip()}
}

Answer 2

您可以模拟该类并将该文件的默认导出分配给变量，如下所示：

jest.mock('../../utils/api/api');
const FakeClass = require('../someFile.js').default;

然后访问模拟类上的函数调用，如下所示：

FakeClass.prototype.myFunc.mock.calls

如何使用Jest测试函数内的类实例

2 个答案:

更新