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Unit testing methods and void flows in jUnit

I am new to unit testing. I understood its principles, but I still can’t understand how to check my current project. I need to check void methods while working with java.nio.SocketChannel. These methods are: - initSelector, where I open the selector, binds a new ServerSocketChannel and registers it
- read by reading the data and putting it in the queue (should I write an additional method to check if this data really exists in the queue? And in this case should I write tests for these methods?)
- a recording method that takes data from the queue and writes it to SocketChannel

I can check these methods in order not to throw an IOException, but what else?
And how do I check the run () Thread method? Or is it not unit testing, but a system or something else?

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3 answers

Basically, you have two options:

  • if you want to fully use unit methods to use these methods, you must hide specific (hardware-dependent components such as sockets, etc. behind mockable interfaces, and use bullying in unit tests to verify that expected calls with expected parameters are made with by these objects.
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, http://code.google.com/p/powermock/.

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