Is it possible to remove a class from an imported gradle library?

Question

I'm searching and trying already one day long to remove a class from an imported library over gradle without really getting it to work, should this be possible with Android+gradle? How to do this?

For example if I include a library like so:

implementation 'org.bouncycastle:bcpkix-jdk15on:1.64'

How to remove a class by name from it? The latest thing I tried was setting in build.gradle:

android {
  sourceSets.main.java.filter.exclude '**/QTeslaKeyEncodingTests.*'
}

Following also doesn't work:

jar {
    sourceSets {
        main {
            java {
                exclude '**/QTeslaKeyEncodingTests.java'
                exclude '**/QTeslaKeyEncodingTests.class'
            }
        }
    }
}

This also doesn't:

android{
  packagingOptions {        
    exclude 'org.bouncycastle/pqc/crypto/qtesla/QTeslaKeyEncodingTests.class'
  }
}

Context: why do I need this currently: when you execute "gradlew testDebug" all tests in the project run, including those present in the imported libs. I also don't know if this is a bug from bouncyCastle that they included those tests in the library but it's a problem because many tests fail.

Answer 1

Exclude a specific package from the instrumentation tests (connectedAndroidTest gradle task) with the notPackage option. For example:

android {
    defaultConfig {
        testInstrumentationRunnerArguments = ["notPackage": "com.example.somelibrary"]
    }
}

There are plenty of potential options for filtering. The official documentation that documents all of them is at -

https://developer.android.com/reference/androidx/test/runner/AndroidJUnitRunner