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Android Test Night #8
2023/03/10
Coroutines Test 入門
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● Kenji Abe
● @STAR_ZERO
● Google Developers Expert for Android, Kotlin
● DeNA Co., Ltd.
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// build.gradle
dependencies {
// ...
testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.6.4")
}
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supsend関数のテスト
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class Sample {
suspend fun run(): String {
return "hoge"
}
}
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class SampleTest {
@Test
fun testRun() = runTest {
val sample = Sample()
val result = sample.run()
assert(result == "hoge")
}
}
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class SampleTest {
@Test
fun testRun() = runTest {
val sample = Sample()
val result = sample.run()
assert(result == "hoge")
}
}
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● runBlockingのようなもの
● delay関数はすべてスキップされる
○ Vertial Timeを制御することができる
● TestScopeが使用される
runTest
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TestDispatchers
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● StandardTestDispatcher
○ runTestデフォルト
○ TestCoroutineSchedulerを使用するシンプルなDispatcher
● UnconfinedTestDispatcher
○ Dispatchers.Unconfinedのようなもの
○ トップレベルのlaunch/asyncがすぐに実行される
TestDispatchers
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class SampleTest {
@Test
fun testRun() = runTest {
val sample = Sample()
val result = sample.run()
assert(result == "hoge")
}
}
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@Test
fun test() = runTest {
var result = 0
launch {
result = 1
}
assert(result == 1)
}
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@Test
fun test() = runTest {
var result = 0
launch {
result = 1
}
assert(result == 1)
}
❌ Failed
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@Test
fun test() = runTest {
var result = 0
launch {
result = 1
}
assert(result == 1)
}
①
②
③
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@Test
fun test() = runTest {
var result = 0
launch {
result = 1
}
runCurrent()
assert(result == 1)
}
✅ Success
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@Test
fun test() = runTest {
var result = 0
launch {
result = 1
}
runCurrent()
assert(result == 1)
}
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④
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@Test
fun test() = runTest {
var result = 0
launch {
delay(1000)
result = 1
}
runCurrent()
assert(result == 1)
}
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@Test
fun test() = runTest {
var result = 0
launch {
delay(1000)
result = 1
}
runCurrent()
assert(result == 1)
}
❌ Failed
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@Test
fun test() = runTest {
var result = 0
launch {
delay(1000)
result = 1
}
runCurrent()
assert(result == 1)
}
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③
④
⑤
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@Test
fun test() = runTest {
// ...
advanceUntilIdle()
// または
advanceTimeBy(1001)
assert(result == 1)
}
✅ Success
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@Test
fun test() = runTest(UnconfinedTestDispatcher()) {
var result = 0
launch {
result = 1
}
assert(result == 1)
}
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@Test
fun test() = runTest(UnconfinedTestDispatcher()) {
var result = 0
launch {
result = 1
}
assert(result == 1)
}
✅ Success
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Mainスレッド対応
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class Sample {
suspend fun run(): String =
withContext(Dispatchers.Main) {
"hoge"
}
}
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@Test
fun testRun() = runTest {
val sample = Sample()
val result = sample.run()
assert(result == "hoge")
}
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@Test
fun testRun() = runTest {
val sample = Sample()
val result = sample.run()
assert(result == "hoge")
}
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@Before
fun setUp() {
Dispatchers.setMain(StandardTestDispatcher())
}
@After
fun tearDown() {
Dispatchers.resetMain()
}
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Flowのテスト
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class Sample {
val flow = MutableSharedFlow()
suspend fun emit(value: Int) {
flow.emit(value)
}
}
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@Test
fun test() = runTest(UnconfinedTestDispatcher()) {
val sample = Sample()
val result = mutableListOf()
val job = launch {
sample.flow.toCollection(result)
}
assert(result.size == 0)
sample.emit(1)
assert(result.size == 1)
assert(result.first() == 1)
job.cancel()
}
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@Test
fun test() = runTest(UnconfinedTestDispatcher()) {
val sample = Sample()
val result = mutableListOf()
// ...
}
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@Test
fun test() = runTest(UnconfinedTestDispatcher()) {
val sample = Sample()
val result = mutableListOf()
val job = launch {
sample.flow.toCollection(result)
}
// ...
}
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@Test
fun test() = runTest(UnconfinedTestDispatcher()) {
val sample = Sample()
val result = mutableListOf()
val job = launch {
sample.flow.toCollection(result)
}
// ...
}
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@Test
fun test() = runTest(UnconfinedTestDispatcher()) {
// ...
val job = launch {
sample.flow.toCollection(result)
}
assert(result.size == 0)
// ...
}
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@Test
fun test() = runTest(UnconfinedTestDispatcher()) {
// ...
val job = launch {
sample.flow.toCollection(result)
}
sample.emit(1)
// ...
}
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@Test
fun test() = runTest(UnconfinedTestDispatcher()) {
// ...
sample.emit(1)
assert(result.size == 1)
assert(result.first() == 1)
job.cancel()
}
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@Test
fun test() = runTest(UnconfinedTestDispatcher()) {
// ...
val job = launch {
sample.flow.toCollection(result)
}
// ...
job.cancel()
}
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@Test
fun test() = runTest(UnconfinedTestDispatcher()) {
// ...
backgroundScope.launch {
sample.flow.toCollection(result)
}
// ...
// job.cancel()
}
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Turbine
（時間の都合上省略...）
https://github.com/cashapp/turbine
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まとめ
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● runTest
● StandardTestDispatcher / UnconfinedTestDispatcher
● Dispatchers.setMain
● backgroundScope
まとめ
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ありがとうございました