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

In my case, I had my instrumented tests in androidTest/java//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!!!