[JS IR] Add test on exportable overriden method

^KT-44415 fixed

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrBoxJsES6TestGenerated.java

@@ -1622,6 +1622,11 @@ public class IrBoxJsES6TestGenerated extends AbstractIrBoxJsES6Test {
             runTest("js/js.translator/testData/box/export/nonIndetifierModuleName.kt");
         }
 
+        @TestMetadata("overridenMethod.kt")
+        public void testOverridenMethod() throws Exception {
+            runTest("js/js.translator/testData/box/export/overridenMethod.kt");
+        }
+
         @TestMetadata("reservedModuleName.kt")
         public void testReservedModuleName() throws Exception {
             runTest("js/js.translator/testData/box/export/reservedModuleName.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrBoxJsTestGenerated.java

@@ -1622,6 +1622,11 @@ public class IrBoxJsTestGenerated extends AbstractIrBoxJsTest {
             runTest("js/js.translator/testData/box/export/nonIndetifierModuleName.kt");
         }
 
+        @TestMetadata("overridenMethod.kt")
+        public void testOverridenMethod() throws Exception {
+            runTest("js/js.translator/testData/box/export/overridenMethod.kt");
+        }
+
         @TestMetadata("reservedModuleName.kt")
         public void testReservedModuleName() throws Exception {
             runTest("js/js.translator/testData/box/export/reservedModuleName.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/BoxJsTestGenerated.java

@@ -1627,6 +1627,11 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             runTest("js/js.translator/testData/box/export/nonIndetifierModuleName.kt");
         }
 
+        @TestMetadata("overridenMethod.kt")
+        public void testOverridenMethod() throws Exception {
+            runTest("js/js.translator/testData/box/export/overridenMethod.kt");
+        }
+
         @TestMetadata("reservedModuleName.kt")
         public void testReservedModuleName() throws Exception {
             runTest("js/js.translator/testData/box/export/reservedModuleName.kt");

js/js.translator/testData/box/export/overridenMethod.kt

@@ -0,0 +1,27 @@
+abstract class Foo1 {
+    abstract fun ok(): String
+}
+
+@JsExport
+class Bar1 : Foo1() {
+    override fun ok(): String {
+        return "OK"
+    }
+}
+
+open class Foo2 {
+    open fun ok(): String {
+        return "fail"
+    }
+}
+
+@JsExport
+class Bar2 : Foo2() {
+    override fun ok(): String {
+        return "OK"
+    }
+}
+
+fun box(): String {
+    return if (Bar1().ok() == "OK" && Bar2().ok() == "OK") "OK" else "fail"
+}