KodeinTest.kt

package com.codingfeline.sample

import android.os.Build
import org.junit.Test
import org.junit.runner.RunWith
import org.kodein.di.Kodein
import org.kodein.di.KodeinAware
import org.kodein.di.erased.bind
import org.kodein.di.erased.instance
import org.kodein.di.erased.provider
import org.kodein.di.erased.singleton
import org.robolectric.RobolectricTestRunner
import org.robolectric.annotation.Config
import kotlin.test.assertSame

@Config(
    sdk = [Build.VERSION_CODES.P],
    manifest = Config.NONE
)
@RunWith(RobolectricTestRunner::class)
class KodeinTest : KodeinAware {

    override val kodein = Kodein {
        bind<AndroidLog>(tag = "android") with singleton { AndroidLog() }
        bind<CommonLog>(tag = "common") with provider { instance<AndroidLog>(tag = "android") }
    }

    val logger: CommonLog by instance(tag = "common")
    val aLogger: AndroidLog by instance(tag = "android")

    @Test
    fun test() {

        logger.log("test")

        assertSame(logger, aLogger)
    }

    interface CommonLog {
        fun log(msg: String)
    }

    class AndroidLog : CommonLog {
        override fun log(msg: String) {
            println(msg)
        }
    }
}