GitHub Actions, GitLab CI, Jenkins, and CircleCI Compared Using One Test Module

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A DEV Community article benchmarks four major CI/CD platforms — GitHub Actions, GitLab CI/CD, Jenkins, and CircleCI — using a shared loyalty-discount calculator from a sample subscription e-commerce app. The module includes eight tests achieving 100% line, branch, and function coverage before being wrapped in equivalent pipeline definitions for each platform. The comparison evaluates configuration structure, execution models, reuse mechanisms, and operational costs rather than vendor marketing. The author argues that the orchestration layer should remain thin and interchangeable, while the test suite itself must stay portable across platforms. The core value of any CI tool, the piece concludes, is consistently surfacing pass/fail results to the entire team without requiring anyone to run tests locally.

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