Contract Testing

 Contract testing- 

The contract is between a consumer (for example, a client who wants to receive some data from an app) and a producer (for example, an API on a server that provides the data the client needs) 

Contract testing is a way to ensure that services can communicate between Producers and Consumers. 

Before making changes in service Producer needs to know if the consumer can still use the service and whether the changes still meet the demands of the consumer’s contract. This is when contract testing plays important role. 

Contracts are written and managed exclusively by consumers, producers must first obtain permission from consumers before they can make any changes. If producers need to implement new features, they can see which consumers would be affected by the change(s) by looking at the status of the consumer’s contract tests.