JS: move more test to box tests

js/js.translator/testData/box/standardClasses/arraysIterator.kt

@@ -0,0 +1,16 @@
+package foo
+
+val a1 = Array<Int>(3, { i: Int -> i })
+
+fun box(): String {
+    val i = a1.iterator()
+    if (i.hasNext() != true) return "fail1"
+    if (i.next() != 0) return "fail2"
+    if (i.hasNext() != true) return "fail3"
+    if (i.next() != 1) return "fail4"
+    if (i.hasNext() != true) return "fail5"
+    if (i.next() != 2) return "fail6"
+    if (i.hasNext() != false) return "fail7"
+
+    return "OK"
+}