In Android test framework there are two types namely,
Local unit tests
There's no need to duplicate tests, you can just annotate them using some of the Android Testing Support Library provided filters or you can create you own annotation.
Then using AndroidJunitRunner you can run tests with or without a particular annotation
Filter test run to tests with given annotation:
adb shell am instrument -w -e annotation com.android.foo.MyAnnotation com.android.foo/android.support.test.runner.AndroidJUnitRunner