represent inspected ObjectID using extended JSON format

lib/bson/types/objectid.rb

@@ -127,7 +127,7 @@ module BSON
     end
 
     def inspect
-      "ObjectID('#{to_s}')"
+      {"$oid" => to_s}
     end
 
     # Convert to MongoDB extended JSON format. Since JSON includes type information,

test/mongo_bson/objectid_test.rb

@@ -50,7 +50,8 @@ class ObjectIDTest < Test::Unit::TestCase
   end
 
   def test_inspect
-    assert_equal "ObjectID('#{@o.to_s}')", @o.inspect
+    obj = {'$oid' => @o.to_s}
+    assert_equal obj, @o.inspect
   end
 
   def test_save_and_restore