Add test for SAM-converted lambdas passed to Obj-C

Based on https://youtrack.jetbrains.com/issue/KT-44799

backend.native/tests/objcexport/expectedLazy.h

@@ -377,6 +377,19 @@ __attribute__((swift_name("EmptyEnum")))
 + (KtKotlinArray<KtEmptyEnum *> *)values __attribute__((swift_name("values()")));
 @end;
 
+__attribute__((swift_name("FunInterface")))
+@protocol KtFunInterface
+@required
+- (int32_t)run __attribute__((swift_name("run()")));
+@end;
+
+__attribute__((objc_subclassing_restricted))
+__attribute__((swift_name("FunInterfacesKt")))
+@interface KtFunInterfacesKt : KtBase
++ (id<KtFunInterface>)getObject __attribute__((swift_name("getObject()")));
++ (id<KtFunInterface>)getLambda __attribute__((swift_name("getLambda()")));
+@end;
+
 __attribute__((swift_name("FHolder")))
 @interface KtFHolder : KtBase
 - (instancetype)init __attribute__((swift_name("init()"))) __attribute__((objc_designated_initializer));

backend.native/tests/objcexport/funInterfaces.kt

@@ -0,0 +1,15 @@
+package funinterfaces
+
+fun interface FunInterface {
+    fun run(): Int
+}
+
+fun getObject(): FunInterface {
+    return object : FunInterface {
+        override fun run() = 1
+    }
+}
+
+fun getLambda(): FunInterface {
+    return FunInterface { 2 }
+}

backend.native/tests/objcexport/funInterfaces.swift

@@ -0,0 +1,15 @@
+import Kt
+
+// Based on https://youtrack.jetbrains.com/issue/KT-44799.
+private func testSAMConversion() throws {
+    try assertEquals(actual: FunInterfacesKt.getObject().run(), expected: 1)
+    try assertEquals(actual: FunInterfacesKt.getLambda().run(), expected: 2)
+}
+
+class FunInterfacesTests : SimpleTestProvider {
+    override init() {
+        super.init()
+
+        test("TestSAMConversion", testSAMConversion)
+    }
+}