如何通过顺序调用测试void函数 [英] How to test a void function with sequential calls

问题描述

如何测试一个不返回值但使用给定参数构造要发送给顺序函数的值的函数?

How can one test a function that does not return a value, but uses given arguments to construct some values which are being sent to a sequential function?

例如

public void handleSomeEvent(String str1, String str2){
   MyObject obj1 = new MyObject();
   obj1.setParameterA(str1);
   obj2.setParameterB(str2);
   EventHandler.getInstance().notify(obj1)
}

在上面的示例中，我想验证是否使用包含str1作为parameterA和str2作为parameter2的对象调用了EventHandler.notify.可以使用一些常见的嘲笑frameowrk(即mockito)来做到这一点吗?

In the above example i would like to verify EventHandler.notify was called with an object containing str1 as parameterA and str2 as parameter2. Can this be done using some common mocking frameowrk (i.e mockito)?

推荐答案

您可以执行以下操作

@RunWith(PowerMockRunner.class)
@PrepareForTest({ EventHandler.class })
public class UnderTestTest {

@Test
public void testLoadUniqueOrNull() throws NKFException {
    PowerMockito.mockStatic(EventHandler.class);

    EventHandler handler = PowerMockito.mock(EventHandler.class);
    PowerMockito.when(EventHandler.getInstance())
            .thenReturn(handler);

    ArgumentCaptor<MyObject> handlerArg = 
    ArgumentCaptor.forClass(MyObject.class);
    PowerMockito.doNothing()
            .when(handler)
            .notify(handlerArg.capture());

    new UnderTest().handleSomeEvent("test");
    Assert.assertEquals(new MyObject("test"), handlerArg.getAllValues()
            .get(0));
}

}


public class UnderTest {
    public void handleSomeEvent(String str1) {
        MyObject obj1 = new MyObject(str1);

        EventHandler.getInstance()
                .notify(obj1);
    }
}


public class MyObject {

    private final String x;

    public MyObject(String x) {
        this.x = x;
    }

    @Override
    public boolean equals(Object obj) {
        return ((MyObject) obj).x == x;
    }
}


public class EventHandler {

    private final static EventHandler e = new EventHandler();

    public static EventHandler getInstance() {
        return e;
    }

    public void notify(MyObject obj) {
        // whatever
    }
}

(请注意，此快速代码是为了演示功能，而不是编码中的最佳做法)

(side note this quick code is to demonstrate the functionality not best practises in coding)

这篇关于如何通过顺序调用测试void函数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！