[java-dev] Re: Re: Unit testing Java externals that call outlet()

Quote: nick rothwell / cassiel wrote on Sun, 12 August 2007 02:24
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> [Have] you looked at JMock?
> 
> 

I just spent some time with JMock and can't get it to do what I need. Since the objects I am dealing with are not interfaces, I was looking at this: http://www.jmock.org/mocking-classes.html. But when I use a ClassImposteriser, it seems like any calls I make to the mock object don't actually do anything. I believe it replaced my class with a empty stub class that does nothing. I need this to happen on the superclass, not my class.

Maybe I just don't understand JMock yet but I do not think it is a good solution for me. Here is all I want to do:
1. Instantiate my mxj external
2. Call some methods on my external that transform it's internal state (these simulate incoming max messages)
3. Use a getter to access the internal state on my external and compare that against an expected value.

In order to accomplish this, I have to prevent MaxObject from doing what it normally does in the runtime environment. Besides the JNI calls, I am also running into an issue where I want to call System.out.println() for debugging and I can't because it is tied to some output stream for the runtime that does not exist when unit testing.

I don't see how JMock would let me easily swap in a fake MaxObject implementation, and even if it did, I don't need or want to deal with JMocks system of expectations. jUnit's asserts() already do everything I need.

Adam