问题
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.
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?
Thank you!
回答1:
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.
Per documents of Spy, you could also do doReturn(null).when(spy).myMethod();
来源：https://stackoverflow.com/questions/25018330/mockito-powermocktio-donothing-for-none-void-method