ActivityManager#isUserAMonkey()

For anyone curious - it's how you check whether the Monkey [1] UI stress-tester/fuzzer is running.

There's also isUserAGoat [2] which is more of an easter egg - initially (and now) it always returns false, but certain versions return true if Goat Simulator is installed [3].

[1] https://developer.android.com/studio/test/monkey

[2] https://developer.android.com/reference/android/os/UserManag...()

[3] https://android.googlesource.com/platform/frameworks/base/+/...