Alexander Udalov
124 lines
3.3 KiB
Kotlin
124 lines
3.3 KiB
Kotlin
/*
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* Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
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* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
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*/
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package kotlin.jdk7.test
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import test.platformNull
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import java.io.*
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import kotlin.test.*
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class UseCloseableResourceTest {
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class Resource(val faultyClose: Boolean = false) : Closeable {
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var isClosed = false
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private set
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override fun close() {
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if (faultyClose)
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throw IOException("Close failed")
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isClosed = true
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}
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}
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@Test fun success() {
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val resource = Resource()
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val result = resource.use { "ok" }
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assertEquals("ok", result)
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assertTrue(resource.isClosed)
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}
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@Test fun closeFails() {
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val e = assertFails {
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Resource(faultyClose = true).use { it.isClosed }
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}
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assertTrue(e is IOException)
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}
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@Test fun opFailsCloseSuccess() {
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val e = assertFails {
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Resource().use { error("op fail") }
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}
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assertTrue(e is IllegalStateException)
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assertTrue(e.suppressed.isEmpty())
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}
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@Test fun opFailsCloseFails() {
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val e = assertFails {
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Resource(faultyClose = true).use { error("op fail") }
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}
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assertTrue(e is IllegalStateException)
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assertTrue(e.suppressed.single() is IOException)
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}
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@Test fun opFailsCloseFailsTwice() {
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val e = assertFails {
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Resource(faultyClose = true).use { _ ->
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Resource(faultyClose = true).use { _ ->
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error("op fail")
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}
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}
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}
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assertTrue(e is IllegalStateException)
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val suppressed = e.suppressed
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assertEquals(2, suppressed.size)
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assertTrue(suppressed.all { it is IOException })
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}
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@Test fun nonLocalReturnInBlock() {
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fun Resource.operation(nonLocal: Boolean): String {
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return use { if (nonLocal) return "nonLocal" else "local" }
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}
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Resource().let { resource ->
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val result = resource.operation(nonLocal = false)
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assertEquals("local", result)
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assertTrue(resource.isClosed)
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}
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Resource().let { resource ->
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val result = resource.operation(nonLocal = true)
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assertEquals("nonLocal", result)
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assertTrue(resource.isClosed)
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}
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}
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@Test fun nullableResourceSuccess() {
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val resource: Resource? = null
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val result = resource.use { "ok" }
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assertEquals("ok", result)
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}
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@Test fun nullableResourceOpFails() {
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val resource: Resource? = null
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val e = assertFails {
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resource.use { requireNotNull(it) }
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}
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assertTrue(e is IllegalArgumentException)
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assertTrue(e.suppressed.isEmpty())
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}
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@Test fun platformResourceOpFails() {
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val resource = platformNull<Resource>()
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val e = assertFails {
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resource.use { requireNotNull(it) }
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}
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assertTrue(e is IllegalArgumentException)
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assertTrue(e.suppressed.isEmpty())
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}
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@Test
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fun contractCallsInPlace() {
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val i: Int
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Resource().use { _ ->
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Resource().use { _ ->
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i = 1
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}
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}
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assertEquals(1, i)
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}
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}
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