[K/N] Migrate misc runtime/ tests to new testing infra ^KT-61259

kotlin-native/runtime/test/kotlinx.cinterop/StableRefTest.kt

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package test.kotlinx.cinterop
+
+import kotlinx.cinterop.*
+import kotlin.native.concurrent.*
+import kotlin.test.*
+
+private class Box(val value: Int)
+
+class StableRefTest {
+    @Test
+    fun crossThreadPassing() = withWorker {
+        val future = execute(TransferMode.SAFE, {}) {
+            StableRef.create(Box(42))
+        }
+        assertEquals(42, future.result.get().value)
+    }
+
+    @Test
+    fun crossThreadPassingAsPointer() = withWorker {
+        val mainThreadRef = StableRef.create(Box(42))
+        // Simulate this going through interop as raw C pointer.
+        val pointerValue: Long = mainThreadRef.asCPointer().toLong()
+        val future = execute(TransferMode.SAFE, { pointerValue }) {
+            val pointer: COpaquePointer = it.toCPointer()!!
+            val otherThreadRef: StableRef<Box> = pointer.asStableRef()
+            otherThreadRef.get().value
+        }
+        assertEquals(42, future.result)
+    }
+}