Fake SQS 
Fake SQS is a lightweight server that mocks the Amazon SQS API.
It is extremely useful for testing SQS applications in a sandbox environment without actually making calls to Amazon, which not only requires a network connection, but also costs money.
Many features are supported and if you miss something, open a pull.
Installation
gem install fake_sqs
Running
fake_sqs --database /path/to/database.yml
Development
bundle install
rake