Unit testing the android platform

So, I was finally able to build and debug the android platform (the process can be seen here). Now, the question is: where are the unit tests, how do I launch them and where do I see results?

And also, is there any guide to android platform archit开发者_运维问答ecture?

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I guess there is no way to run every unit test on Android src.

I don't know about the C code, but you can see that inside some git repos holding Android apps like Contacts they have a tests folder which is an android test project. You can check how to run them here.