~ LeakTest for manual cyclic unlinking

kotlinx-coroutines-core/native/test/LeakTest.kt

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2016-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package kotlinx.coroutines
+
+import kotlin.test.*
+import kotlin.native.concurrent.*
+
+/**
+ * Test manual memory management by unlinking cycle.
+ */
+class LeakTest {
+    @Test
+    fun testLeak() {
+        // create obj1 <-> obj2 cycle
+        val obj1 = Ref()
+        val obj2 = Ref()
+        obj1.ref.value = obj2
+        obj2.ref.value = obj1
+        // freeze it
+        obj1.freeze()
+        // break the cycle 
+        obj1.ref.value = nullRef
+        obj2.ref.value = nullRef
+    }
+}
+
+private class Ref {
+    val ref = FreezableAtomicReference<Ref?>(this)
+}
+
+@SharedImmutable
+private val nullRef = Ref()