| /* |
| * Copyright 2016-2017 JetBrains s.r.o. |
| * |
| * 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 kotlinx.coroutines.experimental |
| |
| import org.junit.After |
| import org.junit.Before |
| import java.util.concurrent.atomic.AtomicBoolean |
| import java.util.concurrent.atomic.AtomicInteger |
| import java.util.concurrent.atomic.AtomicReference |
| |
| /** |
| * Base class for tests, so that tests for predictable scheduling of actions in multiple coroutines sharing a single |
| * thread can be written. Use it like this: |
| * |
| * ``` |
| * class MyTest { |
| * @Test |
| * fun testSomething() = runBlocking<Unit> { // run in the context of the main thread |
| * expect(1) // initiate action counter |
| * val job = launch(context) { // use the context of the main thread |
| * expect(3) // the body of this coroutine in going to be executed in the 3rd step |
| * } |
| * expect(2) // launch just scheduled coroutine for exectuion later, so this line is executed second |
| * yield() // yield main thread to the launched job |
| * finish(4) // fourth step is the last one. `finish` must be invoked or test fails |
| * } |
| * } |
| * ``` |
| */ |
| public actual open class TestBase actual constructor() { |
| /** |
| * Is `true` when nightly stress test is done. |
| */ |
| public actual val isStressTest = System.getProperty("stressTest") != null |
| |
| public val stressTestMultiplierSqrt = if (isStressTest) 5 else 1 |
| |
| /** |
| * Multiply various constants in stress tests by this factor, so that they run longer during nightly stress test. |
| */ |
| public actual val stressTestMultiplier = stressTestMultiplierSqrt * stressTestMultiplierSqrt |
| |
| private var actionIndex = AtomicInteger() |
| private var finished = AtomicBoolean() |
| private var error = AtomicReference<Throwable>() |
| |
| /** |
| * Throws [IllegalStateException] like `error` in stdlib, but also ensures that the test will not |
| * complete successfully even if this exception is consumed somewhere in the test. |
| */ |
| @Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS") |
| public actual fun error(message: Any, cause: Throwable? = null): Nothing { |
| val exception = IllegalStateException(message.toString(), cause) |
| error.compareAndSet(null, exception) |
| throw exception |
| } |
| |
| /** |
| * Throws [IllegalStateException] when `value` is false like `check` in stdlib, but also ensures that the |
| * test will not complete successfully even if this exception is consumed somewhere in the test. |
| */ |
| public inline fun check(value: Boolean, lazyMessage: () -> Any): Unit { |
| if (!value) error(lazyMessage()) |
| } |
| |
| /** |
| * Asserts that this invocation is `index`-th in the execution sequence (counting from one). |
| */ |
| public actual fun expect(index: Int) { |
| val wasIndex = actionIndex.incrementAndGet() |
| check(index == wasIndex) { "Expecting action index $index but it is actually $wasIndex" } |
| } |
| |
| /** |
| * Asserts that this line is never executed. |
| */ |
| public actual fun expectUnreached() { |
| error("Should not be reached") |
| } |
| |
| /** |
| * Asserts that this it the last action in the test. It must be invoked by any test that used [expect]. |
| */ |
| public actual fun finish(index: Int) { |
| expect(index) |
| check(!finished.getAndSet(true)) { "Should call 'finish(...)' at most once" } |
| } |
| |
| private lateinit var threadsBefore: Set<Thread> |
| private val SHUTDOWN_TIMEOUT = 10_000L // 10s at most to wait |
| |
| @Before |
| fun before() { |
| CommonPool.usePrivatePool() |
| threadsBefore = currentThreads() |
| } |
| |
| @After |
| fun onCompletion() { |
| error.get()?.let { throw it } |
| check(actionIndex.get() == 0 || finished.get()) { "Expecting that 'finish(...)' was invoked, but it was not" } |
| CommonPool.shutdown(SHUTDOWN_TIMEOUT) |
| DefaultExecutor.shutdown(SHUTDOWN_TIMEOUT) |
| checkTestThreads(threadsBefore) |
| } |
| |
| @Suppress("ACTUAL_WITHOUT_EXPECT", "ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS") |
| public actual fun runTest( |
| expected: ((Throwable) -> Boolean)? = null, |
| unhandled: List<(Throwable) -> Boolean> = emptyList(), |
| block: suspend CoroutineScope.() -> Unit |
| ) { |
| var exCount = 0 |
| var ex: Throwable? = null |
| try { |
| runBlocking(block = block, context = CoroutineExceptionHandler { context, e -> |
| if (e is CancellationException) return@CoroutineExceptionHandler // are ignored |
| exCount++ |
| if (exCount > unhandled.size) |
| error("Too many unhandled exceptions $exCount, expected ${unhandled.size}, got: $e", e) |
| if (!unhandled[exCount - 1](e)) |
| error("Unhandled exception was unexpected: $e", e) |
| context[Job]?.cancel(e) |
| }) |
| } catch (e: Throwable) { |
| ex = e |
| if (expected != null) { |
| if (!expected(e)) |
| error("Unexpected exception: $e", e) |
| } else |
| throw e |
| } finally { |
| if (ex == null && expected != null) error("Exception was expected but none produced") |
| } |
| if (exCount < unhandled.size) |
| error("Too few unhandled exceptions $exCount, expected ${unhandled.size}") |
| } |
| } |