feat(test): support inline Rstest projects

[9aoy]

This PR allows define.test() to use Rstest inline projects while preserving automatic inheritance from define.app() or define.lib().

The shared adapter is resolved once and applied to each inline project unless the project provides its own extends, while string project entries remain unchanged.

import { define } from 'rstack';
import { defineInlineProject } from 'rstack/test';

define.app({
  // Shared Rsbuild configuration
});

define.test({
  projects: [
    defineInlineProject({
      name: 'ssr',
      include: ['./tests/ssr.test.tsx'],
      testEnvironment: 'node',
    }),
    defineInlineProject({
      name: 'dom',
      include: ['./tests/dom.test.tsx'],
      testEnvironment: 'happy-dom',
    }),
  ],
});

It also adds app and library regression coverage, testing documentation, and a React SSR example demonstrating Node.js and happy-dom projects.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: f8f75889-c486-41c9-b26e-ebc5c59c01b0

📥 Commits

Reviewing files that changed from the base of the PR and between 96c5393 and 3329859.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (9)

• README.md
• examples/documentation/docs/api/testing.mdx
• examples/rstest-inline-projects/package.json
• examples/rstest-inline-projects/rstack.config.ts
• examples/rstest-inline-projects/src/App.tsx
• examples/rstest-inline-projects/src/index.tsx
• examples/rstest-inline-projects/tests/dom.test.tsx
• examples/rstest-inline-projects/tests/ssr.test.tsx
• examples/rstest-inline-projects/tsconfig.json

📝 Walkthrough

Walkthrough

The change refactors automatic extends handling for Rstest configurations, including inline project inheritance and explicit overrides. New tests cover app and library configuration propagation across multiple projects. Documentation explains test project setup and selection. A React SSR example adds app configuration, browser and server test environments, React components, test cases, and TypeScript settings.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: support for inline Rstest projects in tests.
Description check	✅ Passed	The description is directly related to the changeset and accurately describes the new inline project behavior and related coverage.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 9aoy/feat-rstest-inline-projects

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@examples/app-react-ssr/src/index.tsx`:
- Around line 1-8: Replace createRoot with React’s hydrateRoot in the browser
entrypoint so the existing server-rendered markup is hydrated rather than
re-rendered. Update the import and invocation in the root-handling block while
preserving the existing App render and root null check.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 3a1771b6-3e9b-4466-916c-4c93684ffd61

📥 Commits

Reviewing files that changed from the base of the PR and between 62207ea and 96c5393.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (21)

• README.md
• examples/app-react-ssr/package.json
• examples/app-react-ssr/rstack.config.ts
• examples/app-react-ssr/src/App.tsx
• examples/app-react-ssr/src/index.tsx
• examples/app-react-ssr/tests/dom.test.tsx
• examples/app-react-ssr/tests/ssr.test.tsx
• examples/app-react-ssr/tsconfig.json
• examples/documentation/docs/api/_meta.json
• examples/documentation/docs/api/testing.mdx
• packages/rstack/src/config.ts
• packages/rstack/src/rstestConfig.ts
• packages/rstack/test/config/define-test-projects-app/custom.ts
• packages/rstack/test/config/define-test-projects-app/first.ts
• packages/rstack/test/config/define-test-projects-app/index.test.ts
• packages/rstack/test/config/define-test-projects-app/rstack.config.ts
• packages/rstack/test/config/define-test-projects-app/second.ts
• packages/rstack/test/config/define-test-projects-lib/first.ts
• packages/rstack/test/config/define-test-projects-lib/index.test.ts
• packages/rstack/test/config/define-test-projects-lib/rstack.config.ts
• packages/rstack/test/config/define-test-projects-lib/second.ts

[chenjiahan]

I will move ths page to Rstack CLI website in the future