验证模拟对象的方法

Question

Say I have a class like this:

public class Foo {
    private Bar bar;
    public Foo(Bar bar) {
        this.bar = bar;
    }

    public void someMethod() {
        bar.someOtherMethod();
    }
}

How would I verify that bar.someOtherMethod() is called once when someMethod() is called? In my test, I am passing in a mocked Bar class into the constructor.

My test looks something like this:

private Bar bar;
private Foo foo;

@Before
public void setUp() throws Exception {
    bar = mock(Bar.class);
    foo = new Foo(bar);
}

@Test
public void testSomeMethod() {
    foo.someMethod();
    verify(Bar).someOtherMethod();
}

Answer 1

与Mockito-

verify(mockBar, times(1)).someOtherMethod();

Answer 2

Since you're passing in the instance of Bar , it's relatively straightforward:

• Interact with the mock (ie you have to expect that the mock does something (or nothing, in this case)
• Expect that it was interacted with exactly once

With that, you can employ something like this in your test:

doNothing().when(mockBar).someOtherMethod();
foo.someMethod();
verify(mockBar).someOtherMethod();