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Commit 6e3bf78b authored by Lucas Silva's avatar Lucas Silva Committed by Automerger Merge Worker
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Merge "Add helper to convert a kotlin flow to a Condition" into udc-dev am:... 

Merge "Add helper to convert a kotlin flow to a Condition" into udc-dev am: 6a84c0a5 am: 839a256d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22632116



Change-Id: I37c13d392c81bd73c4adeb55ae002801a200e080
Signed-off-by: default avatarAutomerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
parents 6648e948 839a256d

packages/SystemUI/shared/src/com/android/systemui/shared/condition/ConditionExtensions.kt

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package com.android.systemui.shared.condition



import kotlinx.coroutines.CoroutineScope

import kotlinx.coroutines.Job

import kotlinx.coroutines.flow.Flow

import kotlinx.coroutines.launch



/** Converts a boolean flow to a [Condition] object which can be used with a [Monitor] */

@JvmOverloads

fun Flow<Boolean>.toCondition(scope: CoroutineScope, initialValue: Boolean? = null): Condition {

    return object : Condition(initialValue, false) {

        var job: Job? = null



        override fun start() {

            job = scope.launch { collect { updateCondition(it) } }

        }



        override fun stop() {

            job?.cancel()

            job = null

        }

    }

}

packages/SystemUI/tests/src/com/android/systemui/shared/condition/ConditionExtensionsTest.kt

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package com.android.systemui.shared.condition



import android.testing.AndroidTestingRunner

import androidx.test.filters.SmallTest

import com.android.systemui.SysuiTestCase

import com.google.common.truth.Truth.assertThat

import kotlinx.coroutines.ExperimentalCoroutinesApi

import kotlinx.coroutines.flow.MutableSharedFlow

import kotlinx.coroutines.flow.MutableStateFlow

import kotlinx.coroutines.flow.emptyFlow

import kotlinx.coroutines.flow.flowOf

import kotlinx.coroutines.test.StandardTestDispatcher

import kotlinx.coroutines.test.TestScope

import kotlinx.coroutines.test.runCurrent

import kotlinx.coroutines.test.runTest

import org.junit.Before

import org.junit.Test

import org.junit.runner.RunWith



@OptIn(ExperimentalCoroutinesApi::class)

@SmallTest

@RunWith(AndroidTestingRunner::class)

class ConditionExtensionsTest : SysuiTestCase() {

    private lateinit var testScope: TestScope



    @Before

    fun setUp() {

        testScope = TestScope(StandardTestDispatcher())

    }



    @Test

    fun flowInitiallyTrue() =

        testScope.runTest {

            val flow = flowOf(true)

            val condition = flow.toCondition(this)



            runCurrent()

            assertThat(condition.isConditionSet).isFalse()



            condition.start()

            runCurrent()

            assertThat(condition.isConditionSet).isTrue()

            assertThat(condition.isConditionMet).isTrue()

        }



    @Test

    fun flowInitiallyFalse() =

        testScope.runTest {

            val flow = flowOf(false)

            val condition = flow.toCondition(this)



            runCurrent()

            assertThat(condition.isConditionSet).isFalse()



            condition.start()

            runCurrent()

            assertThat(condition.isConditionSet).isTrue()

            assertThat(condition.isConditionMet).isFalse()

        }



    @Test

    fun emptyFlowWithNoInitialValue() =

        testScope.runTest {

            val flow = emptyFlow<Boolean>()

            val condition = flow.toCondition(this)

            condition.start()



            runCurrent()

            assertThat(condition.isConditionSet).isFalse()

            assertThat(condition.isConditionMet).isFalse()

        }



    @Test

    fun emptyFlowWithInitialValueOfTrue() =

        testScope.runTest {

            val flow = emptyFlow<Boolean>()

            val condition = flow.toCondition(scope = this, initialValue = true)

            condition.start()



            runCurrent()

            assertThat(condition.isConditionSet).isTrue()

            assertThat(condition.isConditionMet).isTrue()

        }



    @Test

    fun emptyFlowWithInitialValueOfFalse() =

        testScope.runTest {

            val flow = emptyFlow<Boolean>()

            val condition = flow.toCondition(scope = this, initialValue = false)

            condition.start()



            runCurrent()

            assertThat(condition.isConditionSet).isTrue()

            assertThat(condition.isConditionMet).isFalse()

        }



    @Test

    fun conditionUpdatesWhenFlowEmitsNewValue() =

        testScope.runTest {

            val flow = MutableStateFlow(false)

            val condition = flow.toCondition(this)

            condition.start()



            runCurrent()

            assertThat(condition.isConditionSet).isTrue()

            assertThat(condition.isConditionMet).isFalse()



            flow.value = true

            runCurrent()

            assertThat(condition.isConditionMet).isTrue()



            flow.value = false

            runCurrent()

            assertThat(condition.isConditionMet).isFalse()



            condition.stop()

        }



    @Test

    fun stoppingConditionUnsubscribesFromFlow() =

        testScope.runTest {

            val flow = MutableSharedFlow<Boolean>()

            val condition = flow.toCondition(this)

            runCurrent()

            assertThat(flow.subscriptionCount.value).isEqualTo(0)



            condition.start()

            runCurrent()

            assertThat(flow.subscriptionCount.value).isEqualTo(1)



            condition.stop()

            runCurrent()

            assertThat(flow.subscriptionCount.value).isEqualTo(0)

        }

}