Integration testing

What is integration testing?

Integration testing checks that the separate parts of a system work together. Each piece might pass its own tests in isolation. Integration testing asks the next question. Do they behave correctly once they're connected, calling each other, passing data back and forth?

This sits between two other layers. Unit tests check one function or component on its own. End to end testing drives the whole application the way a user would. Integration testing covers the gaps in between, where most real bugs actually hide. A checkout that calls a payment service, writes to the database, and fires a confirmation email can pass every unit test and still fail because the payment response arrives in a shape the database code never expected. That mismatch is exactly what an integration test catches.

The point is to test the seams. APIs talking to services, services talking to databases, modules handing off to one another. Code rarely breaks inside a well-tested function. It breaks at the boundary where two correct pieces meet and assume different things about each other.

Integration testing at Dallonses

Integration testing is a standing part of how we ship, not a phase we tack on at the end. When components and services come together, we test the connections before anything reaches production. It's a core piece of the quality assurance we build into every project rather than something we sell as an add-on.

We wire these tests into the CI CD pipelines so they run on every change, automatically, before a merge goes anywhere. A broken seam gets caught by the build, not by a user. Software quality assurance done this way keeps the codebase honest as it grows, and it keeps your team confident that shipping fast doesn't mean shipping broken.

Worried the pieces won't hold together under real load? Let's make sure they do.

Talk to us about QA