VItest + Playwright migration

[DBozhinovski]

• Migrates to Vitest + Playwright from Cypress
• Updates tests.yml for GH actions
• Updated README and CONTRIBUTING to reflect changes to tests

[changeset-bot]

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Latest commit: b6d97a6

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[brenelz]

Some build errors that look like this:

import { PluginOption, ViteDevServer } from "vite";

was why i created #2001

[brenelz]

Also complaining about

 ERR_PNPM_OUTDATED_LOCKFILE  Cannot install with "frozen-lockfile" because pnpm-lock.yaml is not up to date with /apps/tests/package.json

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@solidjs/start@2007

commit: b6d97a6

[Copilot]

Pull request overview

This PR migrates the test infrastructure from Cypress to Vitest + Playwright. The migration separates unit tests (Vitest) from end-to-end tests (Playwright), introducing a dual-project Vitest configuration to run tests in both Node and browser environments. The PR also includes code formatting changes that were likely applied by a linter.

• Migrates all E2E tests from Cypress to Playwright with equivalent assertions
• Updates Vitest configuration to support both Node-based and browser-based unit tests
• Removes Cypress dependencies and adds Playwright and Vitest browser dependencies
• Updates documentation to reflect the new testing approach

Reviewed changes

Copilot reviewed 25 out of 27 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/start/src/config/manifest.ts	Code formatting changes (tabs to spaces, line breaks)
packages/start/package.json	Bumps vitest from 3.0.5 to ^4.0.10
package.json	Removes cypress dependency from root
apps/tests/vitest.config.ts	Adds dual-project configuration for Node and browser tests
apps/tests/test-results/.last-run.json	Adds Playwright test results metadata
apps/tests/src/routes/treeshaking/treeshake.test.ts	Deleted (migrated to treeshake.server.test.ts)
apps/tests/src/routes/treeshaking/treeshake.server.test.ts	New server-side unit test for treeshaking
apps/tests/src/routes/api/text-plain.tsx	Deleted (replaced with .ts version)
apps/tests/src/routes/api/text-plain.ts	Simplified API route handler
apps/tests/src/routes/(basic).browser.test.tsx	New browser-based unit test for component
apps/tests/src/e2e/*.test.ts	New Playwright E2E tests (server-function, route-groups, hydration, api-call)
apps/tests/playwright.config.ts	Playwright configuration for E2E tests
apps/tests/package.json	Updates dependencies and test scripts
apps/tests/cypress/*	Removes all Cypress files and configuration
README.md	Updates testing instructions for Playwright
CONTRIBUTING.md	Updates testing conventions and guidance
.gitignore	Replaces Cypress screenshot ignore with test-results
.github/workflows/tests.yml	Updates CI workflow to use Playwright instead of Cypress

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