JS: add tests for private external declarations

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

@@ -6008,6 +6008,12 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             doTest(fileName);
         }
 
+        @TestMetadata("privateExternal.kt")
+        public void testPrivateExternal() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/native/privateExternal.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("safeCastToNativeInterface.kt")
         public void testSafeCastToNativeInterface() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("js/js.translator/testData/box/native/safeCastToNativeInterface.kt");

js/js.translator/testData/box/native/privateExternal.js

@@ -0,0 +1,3 @@
+function foo() {
+    return "OK";
+}

js/js.translator/testData/box/native/privateExternal.kt

@@ -0,0 +1,3 @@
+private external fun foo(): String
+
+fun box() = foo()