This is an example of how to use Pact for contract testing between two services that are separated by a queue. The version 3 of the Pact Specification introduces interactions for services that communicate via message queues.
The project consists of a producing service, the checkout-service and two consuming services, a fulfillment-service and a billing-service.
The checkout-service produces orders and sends them to a queue. These orders are picked up by the two other services. The fulfillment-service is interested in the item names and the customerId and the billing-services sums up the prices of the individual items. The second service is the fulfilment-service which is able to consume orders.
Message passing is done via Testcontainers which provides a mock for Amazon's Simple Queueing Service (SQS).
