Add weak hash set test

src/test/kotlin/ru/dbotthepony/mc/otm/tests/WeakHashSetTests.kt

@@ -0,0 +1,57 @@
+package ru.dbotthepony.mc.otm.tests
+
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+import ru.dbotthepony.mc.otm.core.collect.WeakHashSet
+import ru.dbotthepony.mc.otm.core.collect.forEach
+
+object WeakHashSetTests {
+	@Test
+	@DisplayName("WeakHashSet additions")
+	fun add() {
+		val set = WeakHashSet<Int>()
+
+		check(set.add(1))
+		check(set.add(2))
+		check(set.add(3))
+		check(!set.add(3))
+		check(set.add(10))
+		check(set.add(15))
+		check(!set.add(15))
+		check(!set.add(1))
+	}
+
+	@Test
+	@DisplayName("WeakHashSet removals")
+	fun remove() {
+		val set = WeakHashSet<Int>()
+
+		check(set.add(1))
+		check(set.add(2))
+		check(set.add(3))
+
+		check(set.remove(1))
+		check(set.remove(2))
+		check(set.remove(3))
+
+		check(!set.remove(4))
+	}
+
+	@Test
+	@DisplayName("WeakHashSet traversal")
+	fun traversal() {
+		val set = WeakHashSet<Int>()
+
+		check(set.add(1))
+		check(set.add(2))
+		check(set.add(3))
+		check(set.add(5))
+		check(set.add(6))
+		check(set.remove(1))
+
+		val set2 = mutableSetOf(2, 3, 5, 6)
+		check(set.containsAll(set2))
+
+		set.iterator().forEach { check(set2.remove(it)) }
+	}
+}