SvyatoslavScherbina
57 lines
2.1 KiB
Kotlin
57 lines
2.1 KiB
Kotlin
/*
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* Copyright 2010-2020 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 test.collections
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import kotlin.test.*
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// TODO: consider moving to common stdlib tests.
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class KT42428Test {
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private val listOfLetterIndexPairs = ('a'..'z').withIndex().map { (i, c) -> "$c" to i }
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private val mapOfLetterToIndex = listOfLetterIndexPairs.toMap()
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@Test fun testListOfPairsToMapEntriesContainsMapEntry() {
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testMapEntriesContainsMapEntry(listOfLetterIndexPairs.toMap(), "h", 7)
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}
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@Test fun testMapToMutableMapEntriesContainsMapEntry() {
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testMapEntriesContainsMapEntry(mapOfLetterToIndex.toMutableMap(), "h", 7)
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}
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@Test fun testHashMapEntriesContainsMapEntry() {
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testMapEntriesContainsMapEntry(HashMap(mapOfLetterToIndex), "h", 7)
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}
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@Test fun testLinkedHashMapEntriesContainsMapEntry() {
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testMapEntriesContainsMapEntry(LinkedHashMap(mapOfLetterToIndex), "h", 7)
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}
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// Based on https://youtrack.jetbrains.com/issue/KT-42428.
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private fun testMapEntriesContainsMapEntry(map: Map<String, Int>, key: String, value: Int) {
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data class SimpleEntry<out K, out V>(override val key: K, override val value: V) : Map.Entry<K, V> {
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override fun equals(other: Any?): Boolean =
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other is Map.Entry<*, *> && key == other.key && value == other.value
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override fun hashCode(): Int = key.hashCode() xor value.hashCode()
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override fun toString(): String = "$key=$value"
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}
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assertTrue(map.keys.contains(key))
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// This one requires special efforts to make it work this way.
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// map.entries can in fact be `MutableSet<MutableMap.MutableEntry>`,
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// which [contains] method takes [MutableEntry], so the compiler may generate special bridge
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// returning false for values that aren't [MutableEntry] (including [SimpleEntry]).
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assertTrue(map.entries.contains(SimpleEntry(key, value)))
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assertTrue(map.entries.toSet().contains(SimpleEntry(key, value)))
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}
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}
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