java Mockito / PowerMocktio doNothing for none void 方法
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Mockito / PowerMocktio doNothing for none void method
提问by Mat
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.
我需要一个方法，它在测试期间调用时返回什么都不做，拥有该方法的类实例被实现为间谍。
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?
我知道 doNothing() 方法仅适用于 void 方法。有没有办法通过返回某些内容的方法获得相同的行为？
Thank you!
谢谢！
采纳答案by John B
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 mockis to return null. The default behavior for a spyis to call the wrapped object. When you stuba method in a spyit prevents the call to the wrapped object and executes the specified behavior.
使用when(spy.myMethod()).thenReturn(null). 这将防止间谍调用包装的实例。你必须告诉 Mockito 为返回某些东西的方法返回什么。a 的默认行为mock是 return null。a 的默认行为spy是调用包装的对象。当您stub在 a 中使用方法时，spy它会阻止对包装对象的调用并执行指定的行为。
Per documents of Spy, you could also do doReturn(null).when(spy).myMethod();
根据Spy 的文件，您也可以这样做doReturn(null).when(spy).myMethod();
