茉莉花:测试一个方法是否被另一个类中的另一个方法调用 [英] Jasmine: Testing whether a method is called by another method from another class

问题描述

我有以下2个课程

class B {
  public b() { return 1 }
}

class A {
  b: B = new B()
  public run() { return this.b.b() }
}

我尝试使用以下测试来测试类B的方法b()，但该测试无法正常工作

I tried to use the following test to test did method b() from class B, but the test is not working

describe('A spy', () => {
  let a: A
  let b: B

  beforeEach(() => {
    a = new A()
    b = new B()
    spyOn(b, 'b')

    a.run()
  })

  it('tracks that the spy was called', () => {
    expect(b.b).toHaveBeenCalled()
  })
})

我是否误解了茉莉花的测试概念? 我还尝试了"jasmine.createSpy"，它也无法正常工作

Did i misunderstood jasmine's testing concept? i also tried `jasmine.createSpy', its also not working

P.S.我确实尝试过手动测试，并确认已经调用了类B的方法b().

P.S. i did tried to test it manually and confirmed that the method b() from class B had been called

推荐答案

b变量未在任何地方使用，它与a中的this.b对象不同，因此未调用b.b

b variable isn't used anywhere, it isn't same object as this.b inside a, so b.b isn't called.

应该是:

a = new A()
spyOn(a.b, 'b')
a.run()

expect(a.b.b).toHaveBeenCalled()

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