BaseParcelableTest.kt

import android.os.Bundle
import android.os.Parcel
import android.os.Parcelable

/**
 * Inspired from [here](https://gist.github.com/tomaszpolanski/92a2eada1e06e4a4c71abb298d397173#file-utils-kt)
 */
abstract class BaseParcelableTest {

    inline fun <reified T : Parcelable> testParcel(parcelable: T): T {
        val bytes = marshallParcelable(parcelable)
        return unmarshallParcelable(bytes)
    }

    inline fun <reified T : Parcelable> marshallParcelable(parcelable: T): ByteArray {
        val bundle = Bundle().apply { putParcelable(parcelable::class.java.name, parcelable) }
        return marshall(bundle)
    }

    inline fun <reified T : Parcelable> unmarshallParcelable(bytes: ByteArray): T =
        unmarshall(bytes)
            .readBundle()!!
            .run {
                classLoader = T::class.java.classLoader
                getParcelable(T::class.java.name)!!
            }

    @Suppress("MemberVisibilityCanBePrivate")
    fun marshall(bundle: Bundle): ByteArray {
        return with(Parcel.obtain().apply { this.writeBundle(bundle) }) {
            try {
                this.marshall()
            } finally {
                this.recycle()
            }
        }
    }

    fun unmarshall(bytes: ByteArray): Parcel =
        Parcel.obtain().apply {
            unmarshall(bytes, 0, bytes.size)
            setDataPosition(0)
        }
}