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@file:Suppress("OPT_IN_USAGE")
package com.android.intentresolver.v2.coroutines
/*
* Copyright (C) 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import kotlin.coroutines.CoroutineContext
import kotlin.coroutines.EmptyCoroutineContext
import kotlin.properties.ReadOnlyProperty
import kotlin.reflect.KProperty
import kotlinx.coroutines.CoroutineStart
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.launch
import kotlinx.coroutines.test.TestScope
import kotlinx.coroutines.test.runCurrent
/**
* Collect [flow] in a new [Job] and return a getter for the last collected value.
*
* ```
* fun myTest() = runTest {
* // ...
* val actual by collectLastValue(underTest.flow)
* assertThat(actual).isEqualTo(expected)
* }
* ```
*/
fun <T> TestScope.collectLastValue(
flow: Flow<T>,
context: CoroutineContext = EmptyCoroutineContext,
start: CoroutineStart = CoroutineStart.DEFAULT,
): FlowValue<T?> {
val values by
collectValues(
flow = flow,
context = context,
start = start,
)
return FlowValueImpl { values.lastOrNull() }
}
/**
* Collect [flow] in a new [Job] and return a getter for the collection of values collected.
*
* ```
* fun myTest() = runTest {
* // ...
* val values by collectValues(underTest.flow)
* assertThat(values).isEqualTo(listOf(expected1, expected2, ...))
* }
* ```
*/
fun <T> TestScope.collectValues(
flow: Flow<T>,
context: CoroutineContext = EmptyCoroutineContext,
start: CoroutineStart = CoroutineStart.DEFAULT,
): FlowValue<List<T>> {
val values = mutableListOf<T>()
backgroundScope.launch(context, start) { flow.collect(values::add) }
return FlowValueImpl {
runCurrent()
values.toList()
}
}
/** @see collectLastValue */
interface FlowValue<T> : ReadOnlyProperty<Any?, T> {
operator fun invoke(): T
}
private class FlowValueImpl<T>(private val block: () -> T) : FlowValue<T> {
override operator fun invoke(): T = block()
override fun getValue(thisRef: Any?, property: KProperty<*>): T = invoke()
}
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