How to execute UI tests for a Dynamic Feature Module via Android Studio?

Question

I have a regular :app module and a DFM :feature.

I place the tests for the DFM in androidTest source set inside :feature.

When I try to launch the test using run configuration created by Android Studio it silently fails with Test framework quit unexpectedly.

If I launch the test through the terminal with the command displayed by Android Studio in Run tab I will see:

$ adb shell am instrument -w -m    -e debug false -e class 'com.amazing.feature.AmazingTest' com.amazing.application.test/com.amazing.feature.TestRunner
...
Unable to find instrumentation info for: ComponentInfo{com.amazing.application.test/com.amazing.feature.TestRunner}

Which is not surprising, since the path to the runner is different:

$ adb shell pm list instrumentation
instrumentation:com.amazing.feature.test/com.amazing.feature.TestRunner (target=com.amazing.application)

The test works if I use that instrumentation on the commandline.

Is there a way to teach Android Studio do that?

Which AS version are you using? Looks like some cache is corrupted, which links to the wrong runner path. Maybe some package renaming, an update, or copy/pasting of folders could have caused that. Have you created the dynamic feature module via "Create New Module" or in any other way? — nulldroid
– nulldroid, Commented Sep 6, 2021 at 16:26

Hylke · Accepted Answer · 2021-09-06 16:03:30Z

I got this issue as well, just after upgrading to AGP 7 and the latest Android Studio. In my case it was a bit different, I have the same repository checked out twice, so work on 2 branches simultaneously. In my case, it happened that one branch + android studio instance would work, it did select the correct TestRunner, and the other instance did not work. This lead me to the simple solution of:

Build -> Clean Project
Remove any remaining build folders (was just 1 for me)

Then retry and it did select the correct TestRunner. Other things ive tried, of which I do not know whether or not they helped, are the following:

Make sure I use Java 11 (since i'm on AGP 7)
- Project Structure -> Gradle settings -> Gradle JDK should be something like 11
Disable the experimental feature Do not build Gradle task list during Gradle sync (automatically enabled on Android Studio Arctic Fox)

Oliver Metz · Accepted Answer · 2021-12-02 23:09:57Z

1

I had the same issue. Turns out gradle creates a wrong targetPackage in the <instrumentation> tag in the dynamic feature module's AndroidManifest.xml of the androidTest APK. You can fix this by setting the testApplicationId in the module's build.gradle defaultConfig.

defaultConfig {    
    testApplicationId 'com.amazing.feature.test' // Set the test package here!
    testInstrumentationRunner 'com.amazing.feature.TestRunner'
    [...]
}

More documentation on this on developer.android.com.

edited Dec 2, 2021 at 23:09

answered Dec 2, 2021 at 23:01

Oliver Metz

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