JS: move more test to box tests

js/js.translator/testData/box/operatorOverloading/compareTo.kt

@@ -0,0 +1,18 @@
+package foo
+
+
+class A(t: Int) {
+    var i = t
+    operator fun compareTo(other: A) = (this.i - other.i)
+}
+
+fun box(): String {
+    if (A(3) <= A(2)) return "fail1"
+    if (A(2) < A(2)) return "fail2"
+    if (A(1) < A(0)) return "fail3"
+    if (A(2) > A(2)) return "fail4"
+    if (A(3) > A(4)) return "fail5"
+    if (A(0) >= A(100)) return "fail6"
+
+    return "OK"
+}