How to generate androidtest apk to use in spoon

I am using spoon library for testing android app. I need two apk files

• Main application
• TestApk

I want to ask how to generate that Test.apk ? I have written the test class in my main application androidTest section, i haven't created separate project for tests. now how i am supposed to make my test working ? Guys provide any good link showing how to use spoon.