CI/CD Testing Tools Compared: the Same Pipeline in GitHub Actions, GitLab CI and Jenkins

TL;DR: I compared the major CI/CD tools for test automation (GitHub Actions, GitLab CI, Jenkins, CircleCI, Travis CI, TeamCity, Bitbucket Pipelines, Tekton, Harness) — and instead of stopping at a table, I wrote the exact same test pipeline three times: once for GitHub Actions (running live), once for GitLab CI, and once as a Jenkinsfile, all in one public repo so you can compare the syntax line by line. Repo: github.com/Dayan-18/ci-tools-demo →

Why CI is where your tests actually live

A test suite that runs only on your laptop protects exactly one person: you. The moment tests run automatically on every push and pull request, they protect the whole team — and that's the job of a CI/CD tool. In my previous articles I used GitHub Actions to automate SAST scans, IaC scans and API tests. But GitHub Actions is one option among many. How do the alternatives compare?

The landscape

Tool