spring 3 自动装配和 junit 测试 [英] spring 3 autowiring and junit testing

问题描述

我的代码:

@Component
public class A {
    @Autowired
    private B b;

    public void method() {}
}

public interface X {...}

@Component
public class B implements X {
    ...
}

我想在隔离类 A 中进行测试.我必须模拟 B 类吗?如果是，如何?因为它是自动装配的，并且没有可以发送模拟对象的设置器.

I want to test in isolation class A. Do I have to mock class B? If yes, how? Because it is autowired and there is no setter where i could send the mocked object.

推荐答案

我想在隔离等级 A 中测试.

I want to test in isolation class A.

你绝对应该模拟 B，而不是实例化和注入 B 的实例.重点是测试 A 是否有效，所以你不应该让一个可能损坏的 B 干扰对 A 的测试.

You should absolutely mock B, rather than instantiate and inject an instance of B. The point is to test A whether or not B works, so you should not allow a potentially broken B interfere with the testing of A.

也就是说，我强烈推荐 Mockito.随着模拟框架的发展，它非常易于使用.您将编写如下内容:

That said, I highly recommend Mockito. As mocking frameworks go, it is extremely easy to use. You would write something like the following:

@Test
public void testA() {
    A a = new A();
    B b = Mockito.mock(B.class); // create a mock of B
    Mockito.when(b.getMeaningOfLife()).thenReturn(42); // define mocked behavior of b
    ReflectionTestUtils.setField(a, "b", b); // inject b into the B attribute of A

    a.method();

    // call whatever asserts you need here
}

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