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

^KT-61259

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

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2010-2020 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
+
+// Note: the test parses the generated header with -Werror to detect warnings.
+// It is enough to have just Kotlin declarations at the moment.
+// Adding usages for all declarations to avoid any kind of DCE that may appear later.
+
+#if !NO_GENERICS
+private func testIncompatiblePropertyType() throws {
+    let c = TestIncompatiblePropertyTypeWarning.ClassOverridingInterfaceWithGenericProperty(
+            p: TestIncompatiblePropertyTypeWarningGeneric<NSString>(value: "cba")
+    )
+
+    let pc: TestIncompatiblePropertyTypeWarningGeneric<NSString> = c.p
+    try assertEquals(actual: pc.value, expected: "cba")
+
+    let i: TestIncompatiblePropertyTypeWarningInterfaceWithGenericProperty = c
+    let pi: TestIncompatiblePropertyTypeWarningGeneric<AnyObject> = i.p
+    try assertEquals(actual: pi.value as! String, expected: "cba")
+}
+#endif
+
+private func testGH3992() throws {
+    let d = TestGH3992.D(a: TestGH3992.B())
+    let c: TestGH3992.C = d
+
+    let b: TestGH3992.B = d.a
+    let a: TestGH3992.A = b
+
+    try assertTrue(a is TestGH3992.B)
+}
+
+class HeaderWarningsTests : SimpleTestProvider {
+    override init() {
+        super.init()
+
+#if !NO_GENERICS
+        test("TestIncompatiblePropertyType", testIncompatiblePropertyType)
+#endif
+        test("TestGH3992", testGH3992)
+    }
+}