Why is the Android test runner reporting “Empty test suite”?

Question

I am banging my head against the wall here trying to figure out why IntelliJ/Android is reporting \"Empty test suite\". I have a small project with two IntelliJ Modules (\"

Answer 1

None of the other solutions worked for me, but I was able to get this working simply by uninstalling the existing app or test suite, then running the tests.

Answer 2

In Android studio with spock framework I've changed my gradle's version from 2.2.2 to 3.2.1 and all goes well.

Answer 3

I had this happen to me when I mistakenly marked a non mock class variable with the annotation @Mock Removed the annotation and the tests ran successfully. This happened with Junit 4.5 on Android Studio

Answer 4

Here are my debugging steps I go through when Android Studio all of a sudden decides to stop running / debugging tests (And boy does this happen embarassingly often!!):

• Build: → Rebuild project
• Restart Device: Restart your device/emulator and try again
• Device switch: if you have both a regular phone and an emulator unplug one and try running it with just one of the devices
• Android Studio: File--> Invalidate caches and restart
• Activity Monitor / Task Manager: sort processes by name, see if there is a nameless processes that's using up a lot of ram, this is a "ghost" process from Android studio that must be killed
• git revert: try stashing /reverting your latest code. Sometimes there is a compile error that Android Studio / gradle misses and it will just try to run uncompilable code.
• Uninstall then reinstall Android Studio.

I will add more fixes as I run into them!

Answer 5

In my case, I had my instrumented tests in androidTest/java/<package.name>/MyTestingClass, but I had set my current build variant to "preproduction". And there's the point! As specified in Android Studio documentation:

By default, all tests run against the debug build type.

The message Class not found. Empty test suite. kept appearing until I did this:

1. Add this line to my build.gradle:

   android{
       [...]
       testBuildType "preproduction"
   }
   

2. Synchronised gradle.
3. Delete my previous test configurations since they don't take this Gradle synchronisation into account.

Then I executed the tests again and this time they run just perfect!!!

Answer 6

None of the above fixed it for me. What helped was following the instructions:

Create a test configuration

In Android Studio:

• Open Run menu -> Edit Configurations
• Add a new Android Tests configuration
• Choose a module
• Add a specific instrumentation runner:

  android.support.test.runner.AndroidJUnitRunner

Run the newly created configuration.