commonTest.flow.terminal.LastTest.kt Maven / Gradle / Ivy

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Coroutines support libraries for Kotlin

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/*
 * Copyright 2016-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
 */

package kotlinx.coroutines.flow

import kotlinx.coroutines.*
import kotlin.test.*

class LastTest : TestBase() {
    @Test
    fun testLast() = runTest {
        val flow = flowOf(1, 2, 3)
        assertEquals(3, flow.last())
        assertEquals(3, flow.lastOrNull())
    }

    @Test
    fun testNulls() = runTest {
        val flow = flowOf(1, null)
        assertNull(flow.last())
        assertNull(flow.lastOrNull())
    }

    @Test
    fun testNullsLastOrNull() = runTest {
        val flow = flowOf(null, 1)
        assertEquals(1, flow.lastOrNull())
    }

    @Test
    fun testEmptyFlow() = runTest {
        assertFailsWith { emptyFlow().last() }
        assertNull(emptyFlow().lastOrNull())
    }

    @Test
    fun testBadClass() = runTest {
        val instance = BadClass()
        val flow = flowOf(instance)
        assertSame(instance, flow.last())
        assertSame(instance, flow.lastOrNull())

    }
}