Basics of integration testing

Integration testing is a phase of software testing where individual modules or components of an application are combined and tested as a group to ensure they work together correctly. This type of testing focuses on detecting issues that arise from the interaction between integrated units, such as data transfer errors, interface mismatches, and communication failures.

By validating the combined functionality of these interconnected components, integration testing helps ensure that the overall system operates seamlessly and meets specified requirements. It typically follows unit testing and precedes other types of high-level testing like security and performance testing in the software development lifecycle.

Integration testing uses similar tools to unit testing. For example, you can write integration tests using xUnit.

Unit tests must be:

1. A single unit of behavior.
2. As fast-executing as possible.
3. Isolated from other tests.

The simplest definition of an integration...