commonTest.ListConcurrencyTest.kt Maven / Gradle / Ivy

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A Kotlin Multiplatform Mutable Collections that are thread safe

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import expect.*
import kotlinx.collections.atomic.mutableAtomicListOf
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.runTest
import kotlinx.coroutines.withContext
import kotlin.test.Test

class ListConcurrencyTest {
    val numbers: MutableList = mutableAtomicListOf(1)

    @Test
    fun should_add_items_to_list() {
        numbers.add(1)
    }

    @Test
    fun should_add_items_in_different_threads() = runTest {
        val chars: MutableList = mutableAtomicListOf('A')
        withContext(Dispatchers.Default) {
            chars.add('B')
        }
        withContext(Dispatchers.Unconfined) {
            chars.add('C')
        }
        expect(chars).toContain('A', 'B', 'C')
    }

    @Test
    fun should_add_multiple_items_in_different_threads() = runTest {
        val chars: MutableList = mutableAtomicListOf('A')
        withContext(Dispatchers.Default) {
            chars.addAll(listOf('B'))
        }
        withContext(Dispatchers.Unconfined) {
            chars.addAll(listOf('C'))
        }
        expect(chars).toContain('A', 'B', 'C')
    }

    @Test
    fun should_remove_items_in_any_thread() = runTest {
        val chars: MutableList = mutableAtomicListOf('A', 'B', 'C')
        withContext(Dispatchers.Default) {
            chars.remove('B')
        }
        withContext(Dispatchers.Unconfined) {
            chars.remove('C')
        }
        expect(chars).toContain('A')
    }
}