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I want to add a new asset directory to the Android instrumentation tests via the Variant API, but it is not working as the DSL API. I have attached a sample project that reproduces the issue.

In the build.gradle.kts I have:

val androidComponents = extensions.findByType(AndroidComponentsExtension::class.java)
androidComponents!!.onVariants { variant ->
  if (variant is HasAndroidTest) {
    variant.androidTest?.sources?.assets?.addStaticSourceDirectory("$projectDir/schemas")
  }
}

but when I run my test that validates that the asset file is present, it fails:

❯ ./gradlew app:cAT --rerun-tasks

> Task :app:connectedDebugAndroidTest
Starting 1 tests on Pixel_8_API_33(AVD) - 13

dany.agp.bug.ExampleInstrumentedTest > checkAssetFile[Pixel_8_API_33(AVD) - 13] FAILED 
        java.io.FileNotFoundException: HelloWorld.txt
        at android.content.res.AssetManager.nativeOpenAsset(Native Method)
Tests on Pixel_8_API_33(AVD) - 13 failed: There was 1 failure(s).

Finished 1 tests on Pixel_8_API_33(AVD) - 13

> Task :app:connectedDebugAndroidTest FAILED

I can also see the APK is missing the files:

❯ unzip -l ./app/build/outputs/apk/androidTest/debug/app-debug-androidTest.apk | grep assets

if I comment out the Variant APIs lines above and instead use the 'older' DSL:

android {
  sourceSets {
    getByName("androidTest").assets.srcDir("$projectDir/schemas")
  }
}

then things work as expected:

❯ ./gradlew app:cAT --rerun-tasks                                                           

> Task :app:connectedDebugAndroidTest
Starting 1 tests on Pixel_8_API_33(AVD) - 13

Finished 1 tests on Pixel_8_API_33(AVD) - 13

BUILD SUCCESSFUL in 17s

and the APK also contains the expected asset files:

❯ unzip -l ./app/build/outputs/apk/androidTest/debug/app-debug-androidTest.apk | grep assets
        5  01-01-1981 01:01   assets/HelloWorld.txt

Let me know if you need any more information.