Convert to system app by manually moving the APK to "system/app" folder in Lollipop

I was checking /system/app folder structure in Android L and realized that it has a new folder structure. It has introduced a new folder with APK name between app folder and the APK, e.g. /system/app/test/test.apk

If I want to install test.apk as a system app, how can I install it without installing it via "User app"? Can I just copy and paste test.apk from /sdcard to /system/app folder and give desired permission?