そのうちリリースされると思うけど、まだっぽいのでメモ。
JVM環境では runBlocking を使う事でCoroutinesのテストをかけていたけど、 runBlocking はcoroutines-core (jvm)の機能なので、
Kotlin MPPでのcommon moduleでCoroutinesのテストをするにはいい感じにやってやる必要があります。
common
dependencies: kotlin-test-common, kotlinx-coroutines-core-common
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| import kotlinx.coroutines.CoroutineScope | |
| import kotlin.coroutines.CoroutineContext | |
| import kotlin.coroutines.EmptyCoroutineContext | |
| /** | |
| * To use test suspending function | |
| * @param expected A conditions of expected exception. Default is null (unchecked) | |
| * @param context coroutine context to use | |
| * @param block testing body | |
| */ | |
| expect fun runTest( | |
| expected: ((Throwable) -> Boolean)? = null, | |
| context: CoroutineContext = EmptyCoroutineContext, | |
| block: suspend CoroutineScope.() -> Unit | |
| ) |
jvm
dependencies: kotlin-test-junit5 or kotlin-test-junit4, kotlinx-coroutines-core
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| import kotlinx.coroutines.CoroutineScope | |
| import kotlinx.coroutines.runBlocking | |
| import kotlin.coroutines.CoroutineContext | |
| import kotlin.test.assertTrue | |
| import kotlin.test.fail | |
| actual fun runTest( | |
| expected: ((Throwable) -> Boolean)?, | |
| context: CoroutineContext, | |
| block: suspend CoroutineScope.() -> Unit | |
| ) { | |
| var produced: Throwable? = null | |
| try { | |
| runBlocking(context = context, block = block) | |
| } catch (e: Throwable) { | |
| produced = e | |
| } | |
| if (produced != null) { | |
| if (expected != null) { | |
| assertTrue(expected(produced), "Unexpected exception was produced: $produced") | |
| } else { | |
| throw produced | |
| } | |
| } else { | |
| if (expected != null) { | |
| fail("Expected exception was not produced.") | |
| } | |
| } | |
| } |
ついでにsuspend functionのexpected exception assertionに対応しています。
assertkでもsuspend functionのテストを簡単に書けるようになるといいなと思います。まだ対応は進んでないようです。