I'm very new to Android - I've added android targe...

# testballoon

[Robert Jaros]

I'm very new to Android - I've added android target to my KMP library and tried to configure tests. It seems my android host tests don't execute my commonTests. I tried following the the testballon example but I'm not sure what am I missing.

[Robert Jaros]

What is important in this build file if I don't want to use robolectric?

[Robert Jaros]

I somehow fixed it 😉

[Robert Jaros]

It seems adding `testBalloon-integration-robolectric`dependency fixes my problem but I'm not sure why

[Robert Jaros]

Without this dependency in my named("androidHostTest") {} block running allTest gives me this error:

Execution failed for task ':modules:kilua-rpc-core:testAndroidHostTest'.
> There are test sources present and no filters are applied, but the test task did not discover any tests to execute. This is likely due to a misconfiguration. Please check your test configuration. If this is not a misconfiguration, this error can be disabled by setting the 'failOnNoDiscoveredTests' property to false.

but running just ./gradlew :modules:kilua-rpc-core:testAndroidHostTest works fine (!)

[Robert Jaros]

After adding the dependency running both allTest and single testAndroidHostTest works ok.

[Robert Jaros]

It's a bit strange for me.

[Robert Jaros]

Or not ... the error is back.

[Robert Jaros]

adding junit4 instead seems to help

[Eugen Martynov]

Yeah, I think I saw something similar github.com/BijdorpStudio/kiban/blob/…/build.gradle.kts#…

[Oliver.O]

To configure Android KMP testing using the com.android.kotlin.multiplatform.library plugin without Robolectric I'd use something like this (untested):

plugins {
    id("org.jetbrains.kotlin.multiplatform")
    id("com.android.kotlin.multiplatform.library")
    id("de.infix.testBalloon")
}

kotlin {
    jvm()

    android {
        namespace = "org.example.android.multiplatform.library"
        compileSdk = TODO()
        minSdk = TODO()

        withHostTestBuilder {}.configure {
            // isIncludeAndroidResources = true
        }
        withDeviceTestBuilder {
            sourceSetTreeName = "test"
        }.configure {
            managedDevices {
                localDevices {
                    @Suppress("UnstableApiUsage")
                    create("pixel2api30") {
                        device = "Pixel 2"
                        apiLevel = 30
                        systemImageSource = "aosp"
                    }
                }
            }
        }
    }

    sourceSets {
        commonTest {
            dependencies {
                implementation("de.infix.testBalloon:testBalloon-framework-core:${testBalloonVersion}")
            }
        }

        named("androidHostTest") {
            dependencies {
                implementation("de.infix.testBalloon:testBalloon-framework-core:${testBalloonVersion}")
                implementation(libs.junit.junit4)
                implementation(libs.androidx.test.core)
            }
        }

        named("androidDeviceTest") {
            dependencies {
                implementation("de.infix.testBalloon:testBalloon-framework-core:${testBalloonVersion}")
                implementation(libs.androidx.test.runner)
            }
        }
    }
}

The Android-related docs are here: developer.android.com/kotlin/multiplatform/plugin
I agree that it's somewhat involved, but AGP does not appear stable enough to offer the kind of auto-configuration TestBalloon does for other targets.

If that doesn't work, please point me to a branch in your repo where I could try to set it up.

[Eugen Martynov]

Not sure why android test core is needed. I will check what is inside.

[Oliver.O]

androidx.test.core is optional:
developer.android.com/reference/kotlin/androidx/test/core/app/package-summary

[Robert Jaros]

Is adding testBalloon-framework-core to all source sets intentional? Shouldn't commonTest be enough?

[Oliver.O]

Yes, for recent versions of the com.android.kotlin.multiplatform.library plugin, that's correct. At some point in the evolution from AGP 8 to AGP 9, not all source sets were connected to the common parents.

This should be the required minimum:

sourceSets {
    commonTest {
        dependencies {
            implementation("de.infix.testBalloon:testBalloon-framework-core:${testBalloonVersion}")
        }
    }

    named("androidHostTest") {
        dependencies {
            implementation(libs.junit.junit4)
        }
    }

    named("androidDeviceTest") {
        dependencies {
            implementation(libs.androidx.test.runner)
        }
    }
}