[K/N][Tests] Move codegen test sources interfaceCallsNCasts..vector

^KT-61259

native/native.tests/testData/codegen/intrinsics/interop_sourceCodeStruct.kt

@@ -0,0 +1,43 @@
+@file:Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class, kotlin.native.internal.InternalForKotlinNative::class)
+
+package codegen.intrinsics.interop_sourceCodeStruct
+
+import kotlinx.cinterop.*
+import kotlinx.cinterop.internal.*
+import kotlin.test.*
+
+// Just making sure this doesn't get accidentally forbidden or otherwise broken.
+// Used by auto-generated code, user-defined structs should be declared via
+// structs in C headers or .def files instead.
+
+@CStruct("struct { int p0; int p1; }")
+class S(rawPtr: NativePtr) : CStructVar(rawPtr) {
+
+    companion object : CStructVar.Type(8, 4)
+
+    var x: Int
+        get() = memberAt<IntVar>(0).value
+        set(value) {
+            memberAt<IntVar>(0).value = value
+        }
+
+    var y: Int
+        get() = memberAt<IntVar>(4).value
+        set(value) {
+            memberAt<IntVar>(4).value = value
+        }
+}
+
+@Test
+fun test() = memScoped {
+    val s = alloc<S>()
+
+    s.x = 123
+    assertEquals(123, s.x)
+    assertEquals(123, s.ptr.reinterpret<IntVar>()[0])
+
+    s.y = 321
+    assertEquals(321, s.y)
+    assertEquals(321, s.ptr.reinterpret<IntVar>()[1])
+}