I was working on a few applications that involve servlets recently and I came across a situation that initially seemed challenging to test with Mockito. I wanted to do something relatively simple which was read a Protobuf sent from a client, turn it into an object, and do some processing on it.
The question is how do you test a servlet that needs to get the input stream from a servlet request?
I found a Stack Overflow post that addresses how to do this with an older version of the ServletInputStream but doing it now requires that you override three additional methods (
My issue with this is that I don’t want to override those methods because I don’t really know what I want them to do. If I’m mocking something I want to make sure I know when and where it will be used or I want the mocking framework to return default values or throw exceptions so I know where to look when something breaks.
What I landed on was using the
thenAnswer method like this:
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If you need to ever mock a ServletInputStream feel free to use this code to do it. So far it has worked perfectly for me.