How to define and use a system property in Android Instrumentation test?

Question

I am trying to use some arguments for an Instrumentation test. I noticed that I can read system properties with System.getProperty() function. So I use setprop

Answer 1

Because there are two types of property in Android.

1. System level - we can get/set with command adb shell getprop/setprop.
2. In current process level - we can get/set with regular java System.getProperty()/setProperty().

As you are setting a system level property and trying to get its value as current process level, you are getting null value in log.