Atomic ObjectValerie Nielson3 min readtutorialintermediate
Test GitHub Actions Locally with Act
Summary
act runs GitHub Actions locally in Docker, letting you test PR‑triggered workflows without merging to main.
- act mirrors the GitHub Actions runtime by pulling the same Docker images and injecting environment variables.
- Install Docker, install act, then use `act -l` to list workflows and `act <event>` (e.g., `act pull-request`) to execute them locally.
- Local testing lets you verify node versions, container images, and conditional triggers (e.g., only on pull_request) before pushing code.
- Reduces the need for extra commits or PR merges just to validate a workflow, shortening the CI feedback loop.
Testing CI pipelines locally cuts down on noisy PR cycles and catches configuration errors early, which is especially valuable for complex, multi‑step GitHub Actions.
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