Extended Android Activity crashes unit-test-runner

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 8.1.4
• Cross-platform modules: @nativescript/core 8.1.1
• Android Runtime: 8.1.1

Describe the bug
the nativescript-unit-test-runner is overriding webpack such that the extended activity file (activity.android.ts) is not resolved causing
a crash:

...
System.err: Unable to instantiate activity ComponentInfo{org.nativescript.nstest/org.myApp.MainActivity}: com.tns.NativeScriptException: Failed to create JavaScript extend wrapper for class 'org/myApp/MainActivity'
System.err: 
System.err: StackTrace:
System.err: java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{org.nativescript.nstest/org.myApp.MainActivity}: com.tns.NativeScriptException: Failed to create JavaScript extend wrapper for class 'org/myApp/MainActivity'
System.err: 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3194)

...

To Reproduce

1. create new app ns create ns-test --ts

2. extend Android activity following the instructions here: https://docs.nativescript.org/advanced-concepts.html#extending-android-activity

3. verify that the app runs as expected ns run android (the app runs without any problems)

4. initialize tests ns test init and select jasmine

5. run tests ns test android

6. crash and burn

Expected behavior
That unit tests run, even in the presence of an extended android activity

Sample project
Can't, updating AndroidManifest is required

Reproduce el fallo con ns create ns-test --ts, una actividad de Android extendida, ns test init y ns test android. Empieza rastreando cómo nativescript-unit-test-runner sobrescribe webpack y resuelve activity.android.ts; el trabajo estará terminado cuando las pruebas unitarias se ejecuten correctamente con una actividad de Android extendida presente.