kotlinx-coroutines-core/jvm/test/internal/ConcurrentWeakMapTest.kt

/*
 * Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
 */

package kotlinx.coroutines.internal

import junit.framework.Assert.*
import kotlinx.coroutines.*
import kotlinx.coroutines.debug.internal.*
import org.junit.*

class ConcurrentWeakMapTest : TestBase() {
    @Test
    fun testSimple() {
        val expect = (1..1000).associateWith { it.toString() }
        val m = ConcurrentWeakMap<Int, String>()
        // repeat adding/removing a few times
        repeat(5) {
            assertEquals(0, m.size)
            assertEquals(emptySet<Int>(), m.keys)
            assertEquals(emptyList<String>(), m.values.toList())
            assertEquals(emptySet<Map.Entry<Int, String>>(), m.entries)
            for ((k, v) in expect) {
                assertNull(m.put(k, v))
            }
            assertEquals(expect.size, m.size)
            assertEquals(expect.keys, m.keys)
            assertEquals(expect.entries, m.entries)
            for ((k, v) in expect) {
                assertEquals(v, m.get(k))
            }
            assertEquals(expect.size, m.size)
            if (it % 2 == 0) {
                for ((k, v) in expect) {
                    assertEquals(v, m.remove(k))
                }
            } else {
                m.clear()
            }
            assertEquals(0, m.size)
            for ((k, v) in expect) {
                assertNull(m.get(k))
            }
        }
    }
}