Handsontable Playwright E2E authoring

New E2E is Playwright in tests/e2e/ (*.spec.ts). The legacy Jasmine *.spec.js suite is frozen: add new specs only in Playwright. Reference: tests/e2e/grid.spec.ts + tests/fixtures/pages/GridPage.ts.

Where tests run

Locally, run only the specs you created or changed, under the default theme: cd tests && npx playwright test --project=e2e-main e2e/<your-spec>.spec.ts. The Stop hook and pre-push do this automatically. Every spec is parametrized across a theme (main/horizon/classic) × bundle (umd = handsontable.js, full-min = handsontable.full.min.js) matrix, six projects; CI runs all of them (E2E / Playwright <bundle> (theme: …)). Local gates run e2e-main (plain UMD) only. To run all legs for one spec, drop --project: npx playwright test e2e/<your-spec>.spec.ts. Tests tagged @cross-browser ({ tag: CROSS_BROWSER_TAG } from fixtures/test.ts) also run on Firefox and WebKit through playwright-engines.config.ts (one CI job); tag a test whose behavior an engine could get wrong on its own – real keys, pointer gestures, focus, DOM-read layout. tests/AGENTS.md → "The engine legs" has the local command.

Check port 8123 before you believe a local result

webServer uses reuseExistingServer, so Playwright attaches to whatever already listens on 8123 (a worktree beside the main clone, a leftover support/static-server.mjs) and your specs exercise a build you did not make, with no signal in the output.

lsof -nP -i :8123 | grep LISTEN     # empty = free, safe to run

If it is taken and not yours, leave it running (another session may be mid-run) and use your own port:

cd tests && HOT_TEST_PORT=8131 npx playwright test --project=e2e-main e2e/<your-spec>.spec.ts

HOT_TEST_PORT is read by tests/playwright.config.ts and throws on a malformed or empty value. It applies to the functional suite only; the visual suite's port is owned by visual-tests/src/config.mjs plus two hardcoded app.listen(8082) demo servers.

Rebuild both bundles before an all-legs run

build:umd writes dist/handsontable.js only; the -min legs load handsontable.full.min.js from build:umd.min. Run the full task and check both files moved:

npm --prefix handsontable run build
ls -l handsontable/dist/handsontable.js handsontable/dist/handsontable.full.min.js

Read a mixed result per leg: a split along the bundle axis is about the bundles, not timing (stale bundle vs genuine full.min difference: tests/AGENTS.md).

Five rules

1. Page Object Model. A spec expresses intent; selectors and multi-step flows live in a page object under tests/fixtures/pages/.
2. Hook by data-testid, not structural CSS. Stamp ids in the fixture (or add them to the component when it removes ambiguity). Fall back to role/text locators before grid internals.
3. Web-first waits only. await expect(locator).toBeVisible(); await every assertion. Inside a page object the same rule has six shapes lint cannot see (setTimeout in page.evaluate(), a waitForFunction without { polling }, a scroll method that ends on scrollTop, .at(-1) on a separately read log, a fixture build that fails silently, a negative settle with no positive control), spelled out in references/determinism.md.
4. Isolation. One instance per test; page.route() / page.clock() for network/time. failOnFlakyTests is on in CI: pass-on-retry is a hard failure.
5. Thread the bundle axis. Import test from tests/fixtures/test.ts, destructure { page, theme, bundle }, and pass both to the page object. A new fixture copies the fail-loud ?theme=/?bundle= allowlist block from demo/grid.html (no hardcoded bundle <script src=…>). Formulas specs load HyperFormula as an external script in the fixture. Never-get-wrong list: tests/AGENTS.md.

Which test

• User-visible (rendering, interaction, keyboard, menus, overlays) → E2E here.
• Invisible to users (data, indexing, algorithms) → Jest *.unit.js, still mandatory.
• Public type surface → a *.types.ts type test in the package whose types changed.
• Pure refactor / internal non-runtime → no new test; declare Refactor-only: <reason> in the commit.
• New API / plugin / editor → new spec. Bug fix → a failing case in the closest existing spec.
• Broken or flaky legacy Jasmine → migrate to Playwright.

Full decision rules: handsontable/.ai/TESTING.md.

Test granular user actions

Handsontable implements the low-level interactions, so target fine-grained actions, not app-level happy paths:

• Scrolling: wheel, scrollbar drag, keyboard, momentum/inertial; frozen rows/cols and overlays aligned during and after.
• Pointer: hover (highlights, handles, tooltips), click/dblclick, context menu, drag-to-select, fill-handle drag, column/row resize and move.
• Keyboard: navigation, range selection, editing, shortcuts, enter/escape commit; IME composition for CJK.
• Touch: tap, long-press, touch scroll/drag on mobile viewports.
• Layout: RTL, container resize / ResizeObserver, viewport edges, large-dataset virtualization boundaries.

Overlay-clone gotcha: headers and frozen rows/cols render in several overlay layers (.ht_clone_top, .ht_clone_inline_start, the corner, plus the master), so a data-testid stamped in a renderer or header hook appears more than once. Scope the locator to the overlay (page.locator('.ht_clone_top').getByTestId(...)) or strict mode fails. Unfrozen cells live only in .ht_master.

Perform the action, then assert the exact cell / overlay / selection state. Judge a test by whether it would catch a real bug: test-writing-discipline skill.

Recording

Record with the Playwright CLI (npx playwright codegen), the version-pinned tool installed here, not a Playwright MCP (an unpinned second automation surface, even when one is loaded in the session). Refactor the output into a page object with data-testid selectors before committing.

References

• references/page-objects.md: POM, test ids, grid locators, editing, fixtures & the demo server.
• references/wrappers.md: React / Angular / Vue wrapper E2E.
• references/codegen.md: recording via the CLI, --ui, trace viewer.
• references/determinism.md: the flake-free checklist.

TypeScript style: handsontable/.ai/CONVENTIONS.md.