如何验证由间接私有字段对象发起的方法调用

Question

我正在尝试验证由间接私有字段对象进行的方法调用。例如

测试代码:

class A
{
    final private B b;
    public A(C c, D d)
    {
        this.b = new B(c,d);   
    }
    public void methodToTest()
    {
        b.wantToVerifyThisIsCalled();
    }
}
class B
{
   private C c;
   private D d;
   public B(C c, D d)
   {
      this.c = c; 
      this.d = d;
   }
   ...
   public void wantToVerifyThisIsCalled()
   {
       //do stuff 
       return;
   }
}

我想验证b.wantToVerifyThisIsCalled()方法被调用时，我运行A.methodToTest();

我试过这样做，但这不起作用:

C c = mock(C.class);
D d = mock(D.class); 
A a = new A(C,D);
B b = moc(B.class);
a.methodToTest();
verify(b).wantToVerifyThisIsCalled();  \<-- This gives me error, wanted but not invoked

我该如何验证类A的b字段对象确实在进行方法调用?

没有setter方法，字段对象也被标记为final:(

谢谢

Answer 1

这是因为调用wantToVerifyThisIsCalled()方法的B类对象不是您的模拟对象。您应该将模拟对象注入A。

如果你的A类构造函数直接使用B实例而不是C和D，并依靠它来创建B类对象，那将会更好。

试着这样修改你的类:

class A {
    private final B b;
    public A(B b) { this.b = b; }
    public void methodToTest() {
        b.wantToVerifyThisIsCalled();
    }
}
class B {
    private final C c;
    private final D d;
    public B(C c, D d) { this.c = c; this.d = d; }
    public void wantToVerifyThisIsCalled() { ... }
}

然后像这样测试:

C c = mock(C.class);
D d = mock(D.class); 
B b = mock(B.class);// Find a way to set private fields (May be provide setters).
A a = new A(b);
a.methodToTest();
verify(b).wantToVerifyThisIsCalled();