How to only throw exception when the mocked method is called for the first time?

Question

I have a method of a mocked object that can be called multiple times (think recursion). The method is defined like this:

public void doCommit() { }

In order to tell it to fail I use this convention:

doThrow(new RuntimeException()).when(mMockedObject).doCommit();

This though, makes the method throw this exception EVERY time it is called. How can I make it so that it only, for example, throws it the first and third time it is called? Which means that, for example, the second and forth time it just returns without throwing an exception. Please note that I am not the author of doCommit(), nor do I have source code that I can change.

fnCzar · Accepted Answer · 2010-08-17 00:23:42Z

73

I figured it out (with some hints from Igor). This is how you stub consecutive void method calls:

doThrow(new RuntimeException()).doNothing().doThrow(...).doNothing().when(mMockedObject).doCommit();

thanks Igor!

answered Aug 17, 2010 at 0:23

fnCzar

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1 Comment

Sled Over a year ago

with BDDMockito it would be willThrow(new RuntimeException()).willNothing().willThrow(...).willNothing().given(mMockedObject).doCommit();

Igor Zevaka · Accepted Answer · 2010-08-16 23:09:02Z

24

Reading Stubbing Consecutive Calls doco, something like this might do it:

when(mMockedObject.doCommit()) .thenThrow(new RuntimeException()) .thenCallRealMethod() .thenThrow(new RuntimeException()) .thenCallRealMethod();

If you don't want to actually call the underlying method then you should use thenAnswer instead of thenCallRealMethod method and provide an empty stub imlementation.

answered Aug 16, 2010 at 23:09

Igor Zevaka

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3 Comments

fnCzar Over a year ago

I am not sure this will work (but you might be on to something). When I write this: when(mMockedUpdatingBatch.updateBatch()).thenThrow(new RuntimeException()); I get this compile error: The method when(T) in the type Mockito is not applicable for the arguments (void). I think that when() expects the mocked method to be non-void.

Igor Zevaka Over a year ago

Perhaps it needs to be rewritten back to front if that's possible using doThrow().doCallRealMethod().when(mMockedObject).doCommit();?

Kirill Over a year ago

If I mocked an interface and the thenCallRealMethod will not work, what is the concise thenAnswer invocation which will lead to the same effect as doNothing()?

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