kotlinx-coroutines-test/test/TestRunBlockingOrderTest.kt

/*
 * Copyright 2016-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
 */

package kotlinx.coroutines.test

import kotlinx.coroutines.*
import org.junit.*
import kotlin.coroutines.*

class TestRunBlockingOrderTest : TestBase() {
    @Test
    fun testLaunchImmediate() = runBlockingTest {
        expect(1)
        launch {
            expect(2)
        }
        finish(3)
    }

    @Test
    fun testYield() = runBlockingTest {
        expect(1)
        launch {
            expect(2)
            yield()
            finish(4)
        }
        expect(3)
    }

    @Test
    fun testLaunchWithDelayCompletes() = runBlockingTest {
        expect(1)
        launch {
            delay(100)
            finish(3)
        }
        expect(2)
    }

    @Test
    fun testLaunchDelayOrdered() = runBlockingTest {
        expect(1)
        launch {
            delay(200) // long delay
            finish(4)
        }
        launch  {
            delay(100) // shorter delay
            expect(3)
        }
        expect(2)
    }

    @Test
    fun testVeryLongDelay() = runBlockingTest {
        expect(1)
        delay(100) // move time forward a bit some that naive time + delay gives an overflow
        launch {
            delay(Long.MAX_VALUE / 2) // very long delay
            finish(4)
        }
        launch  {
            delay(100) // short delay
            expect(3)
        }
        expect(2)
    }

    @Test
    fun testAdvanceUntilIdle_inRunBlocking() = runBlockingTest {
        expect(1)
        assertRunsFast {
            advanceUntilIdle()   // ensure this doesn't block forever
        }
        finish(2)
    }
}