[K/N][Tests] Migrate objcSmoke & objcTests tests

^KT-61259

native/native.tests/testData/interop/objc/tests/weakRefs.kt

@@ -0,0 +1,38 @@
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, kotlin.native.runtime.NativeRuntimeApi::class)
+
+import kotlin.native.ref.*
+import kotlinx.cinterop.*
+import kotlin.test.*
+import objcTests.*
+
+@Test fun testWeakRefs() {
+    testWeakReference({ createNSObject()!! })
+
+    createAndAbandonWeakRef(NSObject())
+
+    // Uncomment when KT-61418 fixed
+    //testWeakReference({ NSArray.arrayWithArray(listOf(42)) as NSArray })
+}
+
+private fun testWeakReference(block: () -> NSObject) {
+    val ref = autoreleasepool {
+        createAndTestWeakReference(block)
+    }
+
+    kotlin.native.runtime.GC.collect()
+
+    assertNull(ref.get())
+}
+
+private fun createAndTestWeakReference(block: () -> NSObject): WeakReference<NSObject> {
+    val ref = createWeakReference(block)
+    assertNotNull(ref.get())
+    assertEquals(ref.get()!!.hash(), ref.get()!!.hash())
+    return ref
+}
+
+private fun createWeakReference(block: () -> NSObject) = WeakReference(block())
+
+private fun createAndAbandonWeakRef(obj: NSObject) {
+    WeakReference(obj)
+}