Ilya Gorbunov
88 lines
2.8 KiB
Kotlin
88 lines
2.8 KiB
Kotlin
/*
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* Copyright 2010-2022 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.jdk8.jvm.optionals.test
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import java.util.Optional
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import kotlin.test.*
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import kotlin.jvm.optionals.*
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class OptionalsTest {
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@Test
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fun getOrNull() {
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assertEquals("foo", Optional.of("foo").getOrNull())
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assertNull(Optional.empty<String>().getOrNull())
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}
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@Test
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fun getOrDefault() {
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assertEquals("foo", Optional.of("foo").getOrDefault("bar"))
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assertEquals("bar", Optional.empty<String>().getOrDefault("bar"))
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// Return type can be a supertype
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assertNull(Optional.empty<String>().getOrDefault(null))
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assertEquals(5.0, Optional.empty<Int>().getOrDefault(5.0))
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}
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@Test
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fun getOrElse() {
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assertEquals("foo", Optional.of("foo").getOrElse { throw AssertionError() })
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assertEquals("bar", Optional.empty<String>().getOrElse { "bar" })
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// Return type can be a supertype
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assertNull(Optional.empty<String>().getOrElse { null })
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assertEquals(5.0, Optional.empty<Int>().getOrElse { 5.0 })
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}
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@Test
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fun getOrElse_propagatesException() {
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val e = assertFailsWith<IllegalStateException> {
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Optional.empty<String>().getOrElse { throw IllegalStateException("ran") }
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}
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assertEquals("ran", e.message)
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}
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@Test
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fun optionalToCollection_presentAddsValue() {
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val dest = mutableListOf<CharSequence>()
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Optional.of("foo").toCollection(dest)
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assertEquals(listOf<CharSequence>("foo"), dest)
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}
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@Test
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fun optionalToCollection_emptyAddsNothing() {
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val dest = mutableListOf<String>()
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Optional.empty<String>().toCollection(dest)
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assertEquals(emptyList(), dest)
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}
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@Test
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fun optionalToList() {
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assertEquals(listOf("foo"), Optional.of("foo").toList())
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assertEquals(emptyList(), Optional.empty<String>().toList())
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// List element type can be a supertype
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assertEquals(listOf<CharSequence>("foo"), Optional.of("foo").toList<CharSequence>())
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}
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@Test
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fun optionalToSet() {
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assertEquals(setOf("foo"), Optional.of("foo").toSet())
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assertEquals(emptySet(), Optional.empty<String>().toSet())
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// List element type can be a supertype
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assertEquals(setOf<CharSequence>("foo"), Optional.of("foo").toSet<CharSequence>())
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}
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@Test
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fun optionalAsSequence() {
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assertEquals(listOf("foo"), Optional.of("foo").asSequence().toList())
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assertEquals(emptyList(), Optional.empty<String>().asSequence().toList())
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// List element type can be a supertype
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assertEquals(listOf<CharSequence>("foo"), Optional.of("foo").asSequence<CharSequence>().toList())
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}
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}
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