android tests often stall at 'instantiating tests'

Question

When I click the run test button, Android Studio builds and attempts to run the test.

70% of the time, it says "Instantiating tests..." and never goes anywhere from there. If I kill the adb-server, unplug adevice, or kill an emulator, the test suite magically runs fine.

I even saw a bizarre behavior the other night. I unplugged the device while it said Instantiating Tests. Android Studio picked up that it disappeared. I pulled my phone out of my pocket a few hours later, unlocked it, and out of nowhere, it started running the test suite.

Any idea what can cause this behavior? The closest I've found is Android Test stopping in instantiating tests, but that is referring to a different issue.

Answer 1

I had the same, issue would only occur when running as debug though. Never had it when running normally.

I fixed it by removing Test Orchestrator in my Build.gradle.

//Disable Me //        testInstrumentationRunnerArguments clearPackageData: 'true' //        testOptions { //            execution 'ANDROID_TEST_ORCHESTRATOR' //        } 

Answer 2

This happened to me on my OnePlus 5 as well - I couldn't make it running. Seems like it's related to this device only.

I end up using an emulator and other phones, which works fine.