Disable soft-keyboards for tests

CustomTestRunner.kt

import androidx.test.runner.AndroidJUnitRunner

class CustomJunitRunner : AndroidJUnitRunner() {
    private var enabledImes = emptyList<String>()

    override fun callApplicationOnCreate(app: Application?) {
        super.callApplicationOnCreate(app)

        enabledImes = getEnabledImes()
        disableSoftKeyboards(enabledImes)
    }
    
    override fun finish(resultCode: Int, results: Bundle?) {
        enableSoftKeyboards(enabledImes)

        super.finish(resultCode, results)
    }
}

InstrumentationExt.kt

import android.app.Instrumentation
import android.os.ParcelFileDescriptor
import androidx.test.platform.app.InstrumentationRegistry

val instrumentation: Instrumentation
    get() = InstrumentationRegistry.getInstrumentation()

fun disableSoftKeyboards(enabledImes: List<String>) {
    enabledImes.forEach {
        instrumentation.uiAutomation.executeShellCommand("ime disable $it")
    }
}

fun enableSoftKeyboards(enabledImes: List<String>) {
    enabledImes.forEach {
        instrumentation.uiAutomation.executeShellCommand("ime enable $it")
    }
}

fun getEnabledImes(): List<String> {
    val fileDescriptor = instrumentation.uiAutomation.executeShellCommand("ime list -s")
    val inputStream = ParcelFileDescriptor.AutoCloseInputStream(fileDescriptor)
    return inputStream.bufferedReader().lineSequence().toList()
}