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/*
* Copyright (C) 2019 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.
*/
package com.android.testutils
import android.os.Handler
import android.os.HandlerThread
import com.android.testutils.FunctionalUtils.ThrowingSupplier
import kotlin.test.assertEquals
import kotlin.test.assertFailsWith
import kotlin.test.assertNull
import org.junit.Test
import org.junit.runner.RunWith
import org.junit.runners.JUnit4
private const val ATTEMPTS = 50 // Causes testWaitForIdle to take about 150ms on aosp_crosshatch-eng
private const val TIMEOUT_MS = 200
@RunWith(JUnit4::class)
class HandlerUtilsTest {
@Test
fun testWaitForIdle() {
val handlerThread = HandlerThread("testHandler").apply { start() }
// Tests that waitForIdle can be called many times without ill impact if the service is
// already idle.
repeat(ATTEMPTS) {
handlerThread.waitForIdle(TIMEOUT_MS)
}
// Tests that calling waitForIdle waits for messages to be processed. Use both an
// inline runnable that's instantiated at each loop run and a runnable that's instantiated
// once for all.
val tempRunnable = object : Runnable {
// Use StringBuilder preferentially to StringBuffer because StringBuilder is NOT
// thread-safe. It's part of the point that both runnables run on the same thread
// so if anything is wrong in that space it's better to opportunistically use a class
// where things might go wrong, even if there is no guarantee of failure.
var memory = StringBuilder()
override fun run() {
memory.append("b")
}
}
repeat(ATTEMPTS) { i ->
handlerThread.threadHandler.post { tempRunnable.memory.append("a"); }
handlerThread.threadHandler.post(tempRunnable)
handlerThread.waitForIdle(TIMEOUT_MS)
assertEquals(tempRunnable.memory.toString(), "ab".repeat(i + 1))
}
}
// Statistical test : even if visibleOnHandlerThread doesn't work this is likely to succeed,
// but it will be at least flaky.
@Test
fun testVisibleOnHandlerThread() {
val handlerThread = HandlerThread("testHandler").apply { start() }
val handler = Handler(handlerThread.looper)
repeat(ATTEMPTS) { attempt ->
var x = -10
var y = -11
y = visibleOnHandlerThread(handler, ThrowingSupplier<Int> { x = attempt; attempt })
assertEquals(attempt, x)
assertEquals(attempt, y)
handler.post { assertEquals(attempt, x) }
}
assertFailsWith<IllegalArgumentException> {
visibleOnHandlerThread(handler) { throw IllegalArgumentException() }
}
// Null values may be returned by the supplier
assertNull(visibleOnHandlerThread(handler, ThrowingSupplier<Nothing?> { null }))
}
}
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