Added some tests for a possible bug in ObjectID handling

test/bugs.js

@@ -0,0 +1,41 @@
+var config = require('./config.js');
+var Database = require('../index.js');
+var Model = Database.Model;
+var Instance = Database.Instance;
+var should = require('should');
+var Concoction = require('concoction');
+
+describe('bugs', function () {
+    "use strict";
+    var db = null;
+
+    before(function (done) {
+        db = new Database(config);
+        db.connect(done);
+    });
+
+    it("shouldn't attempt to change an ObjectID when saving an instance", function(done) {
+        var model = new Model(db, 'model', {
+            id: false,
+            data: [String]
+        }, {
+
+        });
+
+        model.remove(function(err) {
+            if(err) return done(err);
+
+            model.create({ data: ['testing'] }, function(err, instance) {
+                if(err) return done(err);
+                should.exist(instance);
+
+                instance.data.push('tested');
+                instance.save(function(err) {
+                    should.not.exist(err);
+                    instance.data.should.eql(['testing', 'tested']);
+                    done();
+                });
+            });
+        });
+    });
+});