Why duplicate folders in an Android project?

I've found out that over a course of several years, a lot of programs keep seemingly duplicate "project folders" in the Android Studio, why is that?

To elaborate a bit further, if you import their projects, and if you take a look at there folder structure, there is going to be something like this:

Java

|--com.myproject.spaceInvader

|--com.myproject.spaceInvader(test)

|--com.myproject.spaceInvader(alphaTest)

What are these? Something generated by 3rd party testing tools?