Instruction to Deploy Contract Test between NextJS and NestJS with Pact
Introduction Contract Testing is an integration testing method focused on verifying the interaction between a Consumer (the service user) and a Provider (the service provider). Instead of testing the entire system, Contract Testing ensures that both parties adhere to a shared covenant (contract). Key benefits include: early detection of non-compatible errors between Frontend and Backend, reduction of dependency on complex staging environments and enabling API changes to be made more confidently without breaking the partner's application. Pact is currently the most popular Consumer-Driven Contract Testing tool. It allows the Consumer to define expectations regarding the response from the Provider and then packages these expectations into a JSON file (Pact file). Pact's advantages lie in supporting multiple languages, automatically generating documentation based on test cases and having robust integration capabilities into CI/CD pipelines to ensure the Provider always meets the C...