7777dadcff docs: add deploy tests documentation to contributing guide (#92388)
<!-- CURSOR_AGENT_PR_BODY_BEGIN -->
## What?

Adds documentation to the contributing guide explaining how deploy tests
work and how to run them.

## Why?

Deploy tests are an important part of the Next.js CI pipeline that
verify the framework works correctly when deployed to Vercel. However,
there was no documentation explaining:
- How deploy tests are triggered on PRs
- How to run deploy tests locally

This came up in a Slack discussion where team members were debugging
deploy test failures and sharing knowledge about how to trigger and run
these tests.

## How?

Added a new "Deploy Tests" section to `contributing/core/testing.md`
that explains:

1. **Triggering Deploy Tests on PRs**: Deploy tests don't run on every
PR by default. To trigger them, you can modify a test file in the deploy
test suite, which causes CI to run deploy tests for that file.

2. **Running Deploy Tests Locally**: You can run deploy tests locally
using:
- `NEXT_TEST_VERSION` to test against a specific commit's pre-built
tarball
- `NEXT_TEST_DEPLOY_URL` to skip the deploy step and test against an
existing deployment

<!-- NEXT_JS_LLM_PR -->
<!-- CURSOR_AGENT_PR_BODY_END -->

[Slack
Thread](https://vercel.slack.com/archives/C04KC8A53T7/p1775265710012189?thread_ts=1775265710.012189&cid=C04KC8A53T7)

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---------

Co-authored-by: Cursor Agent <[email protected]>
2026-04-05 14:58:02 -07:00
2025-10-13 10:43:51 +02:00
2026-04-02 17:19:49 +02:00
2026-04-04 23:26:45 +00:00
2024-06-28 04:41:35 -07:00
2026-04-04 23:26:45 +00:00
2025-01-02 14:31:08 -08:00
2026-04-04 23:26:45 +00:00
…
2024-08-14 13:05:42 +00:00

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Next.js

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Used by some of the world's largest companies, Next.js enables you to create full-stack web applications by extending the latest React features, and integrating powerful Rust-based JavaScript tooling for the fastest builds.

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Good First Issues:

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