Only sends the changed config options.

test/test_sandbox_go.js

 /*
 This file is part of the Juju GUI, which lets users view and manage Juju
 environments within a graphical interface (https://launchpad.net/juju-gui).
 Copyright (C) 2012-2013 Canonical Ltd.
 
 This program is free software: you can redistribute it and/or modify it under
 the terms of the GNU Affero General Public License version 3, as published by
 the Free Software Foundation.
 
 This program is distributed in the hope that it will be useful, but WITHOUT
@@ skipping 937 matching lines @@
             Type: 'Client',
             Request: 'AddRelation',
             Params: {
               Endpoints: ['wordpress:db', 'mysql:db']
             }
           };
           client.onmessage = function(received) {
             var recData = Y.JSON.parse(received.data);
             assert.equal(recData.RequestId, data.RequestId);
             assert.equal(recData.Error, undefined);
+            assert.isObject(
+                state.db.relations.getById('wordpress:db mysql:db'));
             var recEndpoints = recData.Response.Endpoints;
             assert.equal(recEndpoints.wordpress.Name, 'db');
             assert.equal(recEndpoints.wordpress.Scope, 'global');
             assert.equal(recEndpoints.mysql.Name, 'db');
             assert.equal(recEndpoints.mysql.Scope, 'global');
             done();
           };
           client.open();
           client.send(Y.JSON.stringify(data));
         });
       });
     });
 
     it('can add a relation (integration)', function(done) {
       env.connect();
       env.deploy(
           'cs:precise/wordpress-15', null, null, null, 1, null, function() {
             env.deploy(
                 'cs:precise/mysql-26', null, null, null, 1, null, function() {
                   var endpointA = ['wordpress', {name: 'db', role: 'client'}],
                       endpointB = ['mysql', {name: 'db', role: 'server'}];
                   env.add_relation(endpointA, endpointB, function(recData) {
                     assert.equal(recData.err, undefined);
                     assert.equal(recData.endpoint_a, 'wordpress:db');
                     assert.equal(recData.endpoint_b, 'mysql:db');
                     assert.isObject(recData.result);
+                    assert.isObject(
+                       state.db.relations.getById('wordpress:db mysql:db'));
                     done();
                   });
                 }
             );
           }
       );
     });
 
     it('is able to add a relation with a subordinate service', function(done) {
       state.deploy('cs:precise/wordpress-15', function() {
@@ skipping 114 matching lines @@
                   });
                 }
             );
           }
       );
     });
 
   });
 
 })();