update
Simulate an update on a fixture.
store.update(request, callback)
Parameters
- 
			
request
{Object}Parameters for the request.
 - 
			
callback
{function()}A function to call with the updated item and headers.
 
Simulate an update on a fixture.
{Object}Parameters for the request.
{function()}A function to call with the updated item and headers.
store.update(request, response(props,headers))simulates a request to update an items properties on a server.