[K/N][Tests] Migrate framework and objcexport tests

^KT-61259

native/native.tests/testData/framework/objcexport/kt49937.swift

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
+ */
+
+import Kt
+
+// Based on https://youtrack.jetbrains.com/issue/KT-49937.
+
+public extension KT49937 {
+    override var description: String { "KT49937Swift" }
+}
+
+private func test1() throws {
+    try assertEquals(actual: KT49937().description, expected: "KT49937Swift")
+
+    let nsObject: NSObject = KT49937()
+    try assertEquals(actual: nsObject.description, expected: "KT49937Swift")
+}
+
+class Kt49937Tests : SimpleTestProvider {
+    override init() {
+        super.init()
+
+        test("Test1", test1)
+    }
+}