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This repository aims to bridge the gap between JUnit 5 and Robolectric, enabling developers to leverage the benefits of both frameworks for unit testing Android applications. While Robolectric currently lacks a dedicated JUnit 5 extension, this project proposes a community-driven solution to achieve seamless integration.

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package tech.apter.junit.jupiter.robolectric.internal

import org.robolectric.annotation.ResourcesMode
import org.robolectric.annotation.SQLiteMode
import org.robolectric.internal.AndroidSandbox
import org.robolectric.internal.bytecode.ShadowProviders
import org.robolectric.pluginapi.Sdk
import java.util.concurrent.ThreadFactory
import java.util.concurrent.atomic.AtomicLong

@Suppress("LongParameterList")
internal class JUnit5RobolectricAndroidSandbox(
    runtimeSdk: Sdk,
    compileSdk: Sdk,
    resourcesMode: ResourcesMode.Mode,
    @Suppress("VisibleForTests")
    testEnvironmentSpec: TestEnvironmentSpec,
    sdkSandboxClassLoader: SdkSandboxClassLoader,
    shadowProviders: ShadowProviders,
    sqLiteMode: SQLiteMode.Mode,
) : AndroidSandbox(
    runtimeSdk,
    compileSdk,
    resourcesMode,
    testEnvironmentSpec,
    sdkSandboxClassLoader,
    shadowProviders,
    sqLiteMode,
) {
    override fun mainThreadFactory(): ThreadFactory {
        return ThreadFactory { r: Runnable ->
            val name = "SDK ${sdk.apiLevel}"
            Thread(ThreadGroup(name), r, "$name Main Thread ${createThreadId()}")
        }
    }

    private companion object {
        // AtomicLong is used here for safe and efficient ID generation across multiple threads.
        private val threadIds = AtomicLong(1)
        private fun createThreadId(): Long = threadIds.getAndIncrement()
    }
}