Testing guards, interceptors, and middleware
In the complex ecosystem of a NestJS application, components such as guards, interceptors, and middleware play pivotal roles in managing security, data transformation, request/response handling, and operational logging.
These elements are the unsung heroes that work behind the scenes to ensure the application operates securely, efficiently, and reliably. Testing these components individually is as crucial as testing your services or controllers. It ensures that each piece of your application not only performs its intended function in isolation but also interacts seamlessly within the broader application context.
Guards, for instance, are your first line of defense, determining whether a particular request should be processed or denied. Interceptors offer a powerful way to manipulate requests and responses, enabling logging, transformation, or even wrapping of return values. Middleware provides a mechanism to inspect and modify requests...
