Cleaning up and writing tests

game/universe_array.rb

@@ -7,12 +7,19 @@ require './position'
 # indexing as well as point type indexing
 class UniverseArray < Array
   def initialize
-    super
   end
 
   def [](index, *rest)
     if index.is_a?(Position)
-      return self[position.y_pos][position.x_pos]
+      return self[index.y_pos][index.x_pos]
+    else
+      super
+    end
+  end
+
+  def []=(index, *rest)
+    if index.is_a?(Position)
+      return self[index.y_pos][index.x_pos] = rest[0]
     else
       super
     end