The jQuery Mockjax Plugin provides a simple and extremely flexible interface for mocking or simulating ajax requests and responses

WebMock allows stubbing HTTP requests and setting expectations on HTTP requests.

FakeWeb is a helper for faking web requests in Ruby. It works at a global level, without modifying code or writing extensive stubs.

Real stubs and spies for HTTP(S) services

Record network responses for easy stubbing of external calls

Stub HTTP responses

FakerMaker is a simple factory builder so you can throw away your fixtures and generate test data instead.

Ruby gem for using jquery mockjax within rspec examples

A webmock DSL using sinatra.

API for Testing Rack Applications via Mock HTTP

Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests.

Replaces Net::HTTP with a subclass that routes all requests to a Rack application