Can you give examples of automated build and code testing systems used for integrating changes?

Automated build and testing systems that are frequently used for integrating changes include:

• Jenkins — a popular open-source automation server supporting numerous plugins for building, testing, and deploying.
• GitLab CI/CD — built-in GitLab system that allows running pipelines on commits.
• Travis CI — a cloud-based CI/CD platform that integrates with GitHub.
• CircleCI — a cloud and on-premises platform for automating builds and tests.
• TeamCity — a commercial product from JetBrains with powerful configuration capabilities.

These systems automatically trigger builds and tests with each change in the repository, helping to quickly identify errors and maintain code quality.