For those of you traveling in from abroad you will likely require a PCR test ahead of your departure. Tests usually take 12-24 hours to come back so make sure that you get them done with enough anticipation.
Testing centres are usually accessible from most places but if you need to there are also services that can come to your house or hotel.
Tests cost in the range of 120 up to 300 AED, if they come to your house.
Here is some reliable Testing Center ( 150aed):
https://goo.gl/maps/qqwtYz6KCndmWv6r5 - Drive Thru
https://g.page/SaudiGermanHospitalDubai?share - Drive Thru
https://goo.gl/maps/haVvWhkZPQmGHQLk6 - Walk-in