Mockito/PowerMocktio doNothing for none无效方法 [英] Mockito / PowerMocktio doNothing for none void method

问题描述

我需要一个在测试期间被调用时不返回任何内容的方法，拥有该方法的类实例被实现为间谍.

I need a method which returns something to do nothing when invoked during testing, the class instance which owns the method is implemented as a spy.

我知道doNothing()方法仅适用于void方法.有没有一种方法可以返回返回值的方法来获得相同的行为?

I am aware the doNothing() method only works with void methods. Is there a way to get the same behaviour with a method that returns something?

谢谢！

推荐答案

使用when(spy.myMethod()).thenReturn(null).这将防止间谍调用被包装的实例.您必须告诉Mockito对于返回某些内容的方法要返回什么. mock的默认行为是返回null. spy的默认行为是调用包装的对象.在spy中的stub方法中，它将阻止对包装对象的调用，并执行指定的行为.

Use when(spy.myMethod()).thenReturn(null). This will prevent the spy from invoking the wrapped instance. You have to tell Mockito what to return for a method that returns something. The default behavior for a mock is to return null. The default behavior for a spy is to call the wrapped object. When you stub a method in a spy it prevents the call to the wrapped object and executes the specified behavior.

对于间谍的文档，您也可以做doReturn(null).when(spy).myMethod();

Per documents of Spy, you could also do doReturn(null).when(spy).myMethod();

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