[JS IR] Add test for enum exportness

^KT-44494 fixed

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

@@ -0,0 +1,34 @@
+// IGNORE_BACKEND: JS
+// RUN_PLAIN_BOX_FUNCTION
+// INFER_MAIN_MODULE
+
+// MODULE: export-enum-class
+// FILE: lib.kt
+
+@JsExport
+enum class Foo {
+    A,
+    B;
+
+    val foo = ordinal
+
+    fun bar() = name
+
+    companion object {
+        val baz = "baz"
+    }
+}
+
+// FILE: test.js
+function box() {
+    if (this["export-enum-class"].Foo.A !== this["export-enum-class"].Foo.A) return "fail1"
+    if (this["export-enum-class"].Foo.B !== this["export-enum-class"].Foo.B) return "fail2"
+
+    if (this["export-enum-class"].Foo.Companion.baz !== "baz") return "fail3"
+
+    if (this["export-enum-class"].Foo.A.foo !== 0) return "fail4"
+    if (this["export-enum-class"].Foo.B.foo !== 1) return "fail5"
+
+    if (this["export-enum-class"].Foo.A.bar() !== "A") return "fail6"
+    if (this["export-enum-class"].Foo.B.bar() !== "B") return "fail7"
+}