Demo repo for Consumer Driven Contract Tests using Pact

A proof of concept of Consumer Driven Contract Testing for a message based (non-HTTP) producer and consumer relationship using the pact-message-ruby gem.

Pact already supports non-HTTP interactions and contracts in most languages. An official pact-message-ruby gem has existed for several years.

This POC focuses on a hypothetical situation where a potential breaking change has been introduced to a message schema.

The consumer is expecting a message containing a last_name field, however this field has been renamed. The producer is now sending messages with a surname field.

Running consumer side tests and generating a contract

1. Execute the consumer side test for the TestMessageConsumer.

bundle exec rspec

2. The consumer side test should pass.
3. A contract file will be created representing the consumers expectations of the message format.

Running provider side verification of the contract

1. Execute the Pact verification Rake task.

bundle exec rake pact:verify

2. The RSpec tests generated by the Pact provider side verification task should fail.