Upate test reference output.

test.ref

@@ -54,11 +54,14 @@ Point.new(x:3, y:4).magnitude() => 5.000000
   |   __eval__: <primitive Object.__eval__>
   |   __name__: Object
   |   allKeys: <primitive Object.allKeys>
+  |   findKey: <primitive Object.findKey>
+  |   includes: <primitive Object.includes>
   |   keys: <primitive Object.keys>
   |   length: <primitive Object.length>
   |   new: <primitive Object.new>
   |   pop: <primitive Object.pop>
   |   push: <primitive Object.push>
+  |   reversed: <primitive Object.reversed>
   |   sorted: <primitive Object.sorted>
 nil no
 1 yes