JS: move more test to box tests

js/js.translator/testData/box/examples/basicmethod.kt

@@ -0,0 +1,21 @@
+import java.util.ArrayList
+
+interface Tr {
+    fun extra(): String = "_"
+}
+
+class N() : ArrayList<Any>(), Tr {
+    override fun add(el: Any): Boolean {
+        super<ArrayList>.add(el)
+        return super<ArrayList>.add(el.toString() + super<Tr>.extra() + el + extra())
+    }
+
+    override fun extra(): String = super<Tr>.extra() + super<Tr>.extra()
+}
+
+fun box(): String {
+    val n = N()
+    n.add("239")
+    if (n.get(0) == "239" && n.get(1) == "239_239__") return "OK";
+    return "fail";
+}