As modern applications evolve, they often move from simple, single-module designs to systems made up of multiple services, APIs, databases, and third-party integrations. While each component may work perfectly on its own, real issues tend to appear when they start communicating with each other. This is where integration testing becomes incredibly important.

Integration testing helps developers identify problems that don’t show up in unit tests—things like mismatched data formats, unexpected API responses, configuration differences across environments, and subtle bugs that arise only when two or more modules interact. For students learning software development or anyone working on multi-service projects, understanding this testing approach can make a huge difference in preventing failures during deployment.

The guide linked above explains what integration testing is, why it matters, and how it fits into modern development workflows. It also covers practical examples and best practices, especially for applications built with microservices or modular backend systems. If you’re looking to strengthen the stability of your applications or simply want to deepen your testing knowledge, it’s a helpful resource to explore.