Integration testing for microservices

Now that we’ve covered unit testing, let’s move on to integration testing—a critical step in ensuring that microservices work together as expected in a real-world environment. While unit testing focuses on testing individual service logic in isolation, integration testing verifies that different services can communicate, share data, and perform coordinated tasks effectively.

In microservice architecture, services often interact via message queues, HTTP requests, or event-driven mechanisms. Therefore, integration testing goes beyond just testing the logic of individual services; it ensures the reliability of inter-service communication.

We’ll use the example of OrderService and InventoryService from the project to demonstrate how integration testing is done in a microservices setup. Since these services interact through event emission (for example, when an order is created in OrderService, an event is sent to InventoryService...