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/*
* Copyright 2016-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.coroutines.android
import android.os.*
import kotlinx.coroutines.*
import org.junit.Test
import org.junit.runner.*
import org.robolectric.*
import org.robolectric.Shadows.*
import org.robolectric.annotation.*
import org.robolectric.shadows.*
import org.robolectric.util.*
import kotlin.test.*
@RunWith(RobolectricTestRunner::class)
@Config(manifest = Config.NONE, sdk = [28])
class HandlerDispatcherTest : TestBase() {
/**
* Because [Dispatchers.Main] is a singleton, we cannot vary its initialization behavior. As a
* result we only test its behavior on the newest API level and assert that it uses async
* messages. We rely on the other tests to exercise the variance of the mechanism that the main
* dispatcher uses to ensure it has correct behavior on all API levels.
*/
@Test
fun mainIsAsync() = runTest {
ReflectionHelpers.setStaticField(Build.VERSION::class.java, "SDK_INT", 28)
val mainLooper = ShadowLooper.getShadowMainLooper()
mainLooper.pause()
val mainMessageQueue = shadowOf(Looper.getMainLooper().queue)
val job = launch(Dispatchers.Main) {
expect(2)
}
val message = mainMessageQueue.head
assertTrue(message.isAsynchronous)
job.join(mainLooper)
}
@Test
fun asyncMessagesApi14() = runTest {
ReflectionHelpers.setStaticField(Build.VERSION::class.java, "SDK_INT", 14)
val main = Looper.getMainLooper().asHandler(async = true).asCoroutineDispatcher()
val mainLooper = ShadowLooper.getShadowMainLooper()
mainLooper.pause()
val mainMessageQueue = shadowOf(Looper.getMainLooper().queue)
val job = launch(main) {
expect(2)
}
val message = mainMessageQueue.head
assertFalse(message.isAsynchronous)
job.join(mainLooper)
}
@Test
fun asyncMessagesApi16() = runTest {
ReflectionHelpers.setStaticField(Build.VERSION::class.java, "SDK_INT", 16)
val main = Looper.getMainLooper().asHandler(async = true).asCoroutineDispatcher()
val mainLooper = ShadowLooper.getShadowMainLooper()
mainLooper.pause()
val mainMessageQueue = shadowOf(Looper.getMainLooper().queue)
val job = launch(main) {
expect(2)
}
val message = mainMessageQueue.head
assertTrue(message.isAsynchronous)
job.join(mainLooper)
}
@Test
fun asyncMessagesApi28() = runTest {
ReflectionHelpers.setStaticField(Build.VERSION::class.java, "SDK_INT", 28)
val main = Looper.getMainLooper().asHandler(async = true).asCoroutineDispatcher()
val mainLooper = ShadowLooper.getShadowMainLooper()
mainLooper.pause()
val mainMessageQueue = shadowOf(Looper.getMainLooper().queue)
val job = launch(main) {
expect(2)
}
val message = mainMessageQueue.head
assertTrue(message.isAsynchronous)
job.join(mainLooper)
}
@Test
fun noAsyncMessagesIfNotRequested() = runTest {
ReflectionHelpers.setStaticField(Build.VERSION::class.java, "SDK_INT", 28)
val main = Looper.getMainLooper().asHandler(async = false).asCoroutineDispatcher()
val mainLooper = ShadowLooper.getShadowMainLooper()
mainLooper.pause()
val mainMessageQueue = shadowOf(Looper.getMainLooper().queue)
val job = launch(main) {
expect(2)
}
val message = mainMessageQueue.head
assertFalse(message.isAsynchronous)
job.join(mainLooper)
}
@Test
fun testToString() {
ReflectionHelpers.setStaticField(Build.VERSION::class.java, "SDK_INT", 28)
val main = Looper.getMainLooper().asHandler(async = true).asCoroutineDispatcher("testName")
assertEquals("testName", main.toString())
assertEquals("testName.immediate", main.immediate.toString())
assertEquals("testName.immediate", main.immediate.immediate.toString())
}
private suspend fun Job.join(mainLooper: ShadowLooper) {
expect(1)
mainLooper.unPause()
join()
finish(3)
}
// TODO compile against API 23+ so this can be invoked without reflection.
private val Looper.queue: MessageQueue
get() = Looper::class.java.getDeclaredMethod("getQueue").invoke(this) as MessageQueue
// TODO compile against API 22+ so this can be invoked without reflection.
private val Message.isAsynchronous: Boolean
get() = Message::class.java.getDeclaredMethod("isAsynchronous").invoke(this) as Boolean
@Test
fun testImmediateDispatcherYield() = runBlocking(Dispatchers.Main) {
expect(1)
// launch in the immediate dispatcher
launch(Dispatchers.Main.immediate) {
expect(2)
yield()
expect(4)
}
expect(3) // after yield
yield() // yield back
finish(5)
}
@Test
fun testMainDispatcherToString() {
assertEquals("Dispatchers.Main", Dispatchers.Main.toString())
assertEquals("Dispatchers.Main.immediate", Dispatchers.Main.immediate.toString())
}
}
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