JS backend: tests for KT-6323 KotlinJS library modules

js/js.translator/testData/multiModule/cases/useElementsFromDefaultPackageInAnotherModule/main/main.kt

@@ -0,0 +1,7 @@
+fun box(): String {
+
+    assertEquals("A: invoked from module", f("A"))
+    assertEquals(10, A(10).x)
+
+    return "OK"
+}