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kotlinlang

Hello everybody, I'm trying to run my instrumented tests with Firebase Test Lab, yet getting this error:
```
Matrix [matrix-6a9q91kg6iw8a] failed during validation: The test APK does not contain the test runner class specified by the user or the manifest file. The test runner class name may be incorrect, or the class may be mislocated in the app APK..
```
tests are running well locally as well as in jenkins. I'm running:
```
gcloud firebase test android run \
                               --type instrumentation \
                               --app app-dev-debug.apk \
                               --test app-dev-debug-androidTest.apk \
                               --device model=Nexus6,version=21,locale=en,orientation=portrait \
                               --timeout 90s
```
In my build.gradle:
```
...
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
...
```
Any idea?