I don’t have yet my Adroid device, so, is it possible to use the Android Virtual Machine / Android Virtual Device to test my app?
thanks in advance… 
God Bless us all…
Yes, it is possible to test Android apps on an emulator.
The emulator may be helpful since you have no device at the moment, but emulators aren’t always accurate. Meaning the only way to make sure you app works as intended is to test on an actual device.