[K/N][tests] Migrate various runtime/ tests ^KT-61259

native/native.tests/testData/gc/weak0.kt

@@ -0,0 +1,38 @@
+// DISABLE_NATIVE: gcType=NOOP
+import kotlin.test.*
+import kotlin.native.ref.*
+
+data class Data(val s: String)
+
+@OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+fun localWeak(): WeakReference<Data>  {
+    val x = Data("Hello")
+    val weak = WeakReference(x)
+    assertSame(x, weak.get())
+    return weak
+}
+
+@OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+fun multiWeak(): Array<WeakReference<Data>>  {
+    val x = Data("Hello")
+    val weaks = Array(100, { WeakReference(x) } )
+    weaks.forEach {
+        it -> if (it.get()?.s != "Hello") throw Error("bad reference")
+    }
+    return weaks
+}
+
+@OptIn(kotlin.native.runtime.NativeRuntimeApi::class, kotlin.experimental.ExperimentalNativeApi::class)
+@Test fun runTest() {
+    val weak = localWeak()
+    kotlin.native.runtime.GC.collect()
+    assertNull(weak.get())
+
+    val weaks = multiWeak()
+
+    kotlin.native.runtime.GC.collect()
+
+    weaks.forEach {
+        it -> if (it.get()?.s != null) throw Error("not null")
+    }
+}