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112
kotlinx-coroutines-test/common/test/TestExceptionHandlerTest.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| /* | ||
| * Copyright 2016-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license. | ||
| */ | ||
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| package kotlinx.coroutines.test | ||
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| import kotlinx.coroutines.* | ||
| import kotlin.coroutines.* | ||
| import kotlin.random.* | ||
| import kotlin.test.* | ||
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| class TestExceptionHandlerTest { | ||
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| /** Tests that passing a [TestExceptionHandler] to [TestCoroutineScope] overrides the exception handling there. */ | ||
| @Test | ||
| fun testPassingToCoroutineScope() { | ||
| var enteredHandler = false | ||
| var observedScope: TestCoroutineScope? = null | ||
| val handler = TestExceptionHandler { _, throwable -> | ||
| assertTrue(throwable is TestException) | ||
| observedScope = this | ||
| enteredHandler = true | ||
| } | ||
| val scope = createTestCoroutineScope(handler + SupervisorJob()) | ||
| scope.launch { | ||
| throw TestException("test") | ||
| } | ||
| scope.runCurrent() | ||
| assertTrue(enteredHandler) | ||
| assertSame(scope, observedScope) | ||
| scope.cleanupTestCoroutines() | ||
| } | ||
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| /** Tests that passing a [TestCoroutineScope] to the [TestExceptionHandler] will link, but won't affect the | ||
| * coroutine context of [TestCoroutineScope]. */ | ||
| @Test | ||
| fun testExplicitLinking() { | ||
| var observedScope: TestCoroutineScope? = null | ||
| val scope = createTestCoroutineScope(SupervisorJob()) | ||
| val handler = TestExceptionHandler(scope) { _, throwable -> | ||
| assertTrue(throwable is TestException) | ||
| observedScope = this | ||
| } | ||
| scope.launch(handler) { | ||
| throw TestException("test1") | ||
| } | ||
| scope.launch { | ||
| throw TestException("test2") | ||
| } | ||
| scope.runCurrent() | ||
| assertSame(scope, observedScope) | ||
| try { | ||
| scope.cleanupTestCoroutines() | ||
| throw AssertionError("won't reach") | ||
| } catch (e: TestException) { | ||
| assertEquals("test2", e.message) | ||
| } | ||
| } | ||
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| /** Tests that passing a [TestExceptionHandler] that's already linked to another [TestCoroutineScope] will cause it | ||
| * to be copied. */ | ||
| @Test | ||
| fun testRelinking() { | ||
| val encountered = mutableListOf<TestCoroutineScope>() | ||
| val handler = TestExceptionHandler { _, throwable -> | ||
| assertTrue(throwable is TestException) | ||
| encountered.add(this) | ||
| } | ||
| val scopes = List(3) { createTestCoroutineScope(handler + SupervisorJob()) } | ||
| val events = List(10) { Random.nextInt(0, 3) }.map { scopes[it] } | ||
| events.forEach { | ||
| it.launch { | ||
| throw TestException() | ||
| } | ||
| it.runCurrent() | ||
| } | ||
| assertEquals(events, encountered) | ||
| } | ||
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| /** Tests that throwing inside [TestExceptionHandler] is reported. */ | ||
| @Test | ||
| fun testThrowingInsideHandler() { | ||
| val handler = TestExceptionHandler { _, throwable -> | ||
| assertEquals("y", throwable.message) | ||
| throw TestException("x") | ||
| } | ||
| val scope = createTestCoroutineScope(handler) | ||
| scope.launch { | ||
| throw TestException("y") | ||
| } | ||
| scope.runCurrent() | ||
| try { | ||
| scope.cleanupTestCoroutines() | ||
| throw AssertionError("can't be reached") | ||
| } catch (e: TestException) { | ||
| assertEquals("x", e.message) | ||
| } | ||
| } | ||
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| /** Tests that throwing inside [TestExceptionHandler] after the scope is cleaned up leads to problems. */ | ||
| @Test | ||
| @Ignore // difficult to check on JS and Native, where the error is simply logged | ||
| fun testThrowingInsideHandlerAfterCleanup() { | ||
| val handler = TestExceptionHandler { _, throwable -> | ||
| reportException(throwable) | ||
| } | ||
| val scope = createTestCoroutineScope(handler) | ||
| scope.cleanupTestCoroutines() | ||
| handler.handleException(EmptyCoroutineContext, TestException()) | ||
| } | ||
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| } |
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