Testing asynchronous interactions in distributed systems using Spring Cloud Contract

This is a sample application code of the blog post Testing asynchronous interactions in distributed systems using Spring Cloud Contract published in the epages developer blog.

It illustrates how Spring Cloud Contract can be used to test asynchronous service interactions.

Please see the blog post for details.

Run the application

A docker-compose setup exists to start the product-service, the checkout-service, and RabbitMQ.

First build the services to generate the jar files. And then use docker-compose to start the services.

cd <checkout-directory>/product-service
./gradlew check bootRepackage

For the product service we also need to make sure that the contracts have been published to the local maven repository.

./gradlew publishToMavenLocal

cd <checkout-directory>/checkout-service
./gradlew check bootRepackage

docker-compose up -d

Create a Product and add it to a cart

We use httpie as command line HTTP client.

Create a product

http POST <docker-ip>:8081/products name=some salesPrice=49.99 purchasePrice=39.99

Create a cart

http POST <docker-ip>:8082/carts

Use the uri in the location header for the next request

Add a product to the cart

The product data should be available in the cart now and we should be able to add it.

http PUT <docker-ip>:8082/carts/1 quantity=2 productId=1