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A flat Travis CI matrix runs every job in parallel, so a slow deploy can race ahead of fast unit tests. Build stages group jobs into ordered phases that act as hard gates.
Learn how to structure .travis.yml with named stages so independent jobs run in parallel while deployment waits for all prior stages to succeed.
Travis CI build stages let you gate deploys behind tests with a simple stages/jobs.include syntax. Here's a worked three-stage config, plus the artifact-persistence trap most teams hit.
Travis CI build stages turn deployment into a consequence of green tests: stages run sequentially, jobs within a stage run in parallel, and a failed stage skips everything after it.
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