如何告诉Mockito模拟对象在下次调用时返回不同的东西？ [英] How to tell a Mockito mock object to return something different the next time it is called?

问题描述

所以，我正在创建一个模拟对象作为类级别的静态变量，如此...在一个测试中，我想要 Foo.someMethod（）到返回一个值，而在另一个测试中，我希望它返回一个不同的值。我遇到的问题是，似乎我需要重建模拟才能使其正常工作。我想避免重建模拟，并在每次测试中使用相同的对象。

So, I'm creating a mock object as a static variable on the class level like so... In one test, I want Foo.someMethod() to return a certain value, while in another test, I want it to return a different value. The problem I'm having is that it seems I need to rebuild the mocks to get this to work correctly. I'd like to avoid rebuilding the mocks, and just use the same objects in each test.

class TestClass {

    private static Foo mockFoo;

    @BeforeClass
    public static void setUp() {
        mockFoo = mock(Foo.class);
    }

    @Test
    public void test1() {
        when(mockFoo.someMethod()).thenReturn(0);

        TestObject testObj = new TestObject(mockFoo);

        testObj.bar(); // calls mockFoo.someMethod(), receiving 0 as the value

    }

    @Test
    public void test2() {
        when(mockFoo.someMethod()).thenReturn(1);

        TestObject testObj = new TestObject(mockFoo);

        testObj.bar(); // calls mockFoo.someMethod(), STILL receiving 0 as the value, instead of expected 1.

    }

}

在第二次测试中，当调用testObj.bar（）时，我仍然收到0作为值...什么是解决的最佳方法这个？请注意，我知道我可以在每个测试中使用不同的 Foo 模拟，但是，我必须将多个请求链接到 mockFoo ，意思是我必须在每个测试中进行链接。

In the second test, I'm still receiving 0 as the value when testObj.bar() is called... What is the best way to resolve this? Note that I know I could use a different mock of Foo in each test, however, I have to chain multiple requests off of mockFoo, meaning I'd have to do the chaining in each test.

推荐答案

首先不要制作模拟静态。使它成为一个私人领域。只需将您的setUp类放入 @Before 而不是 @BeforeClass 。它可能运行一堆，但它很便宜。

First of all don't make the mock static. Make it a private field. Just put your setUp class in the @Before not @BeforeClass. It might be run a bunch, but it's cheap.

其次，你现在拥有它的方法是让模拟返回不同的东西的正确方法，具体取决于测试。

Secondly, the way you have it right now is the correct way to get a mock to return something different depending on the test.

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