feat: export headless testing utils (#167)

Set up playwright exports and export reusable combobox testing util.

## Checklist

- [x] The added / edited code has been documented with
[JSDoc](https://jsdoc.app/about-getting-started)
- [x] All changes are documented in the documentation app (folder
`apps/docs`)
- [x] If a new component is added, at least one [Playwright screenshot
test](https://github.com/SchwarzIT/onyx/actions/workflows/playwright-screenshots.yml)
is added
- [x] A changeset is added with `npx changeset add` if your changes
should be released as npm package (because they affect the library
usage)

.changeset/thirty-timers-allow.md

@@ -0,0 +1,5 @@
+---
+"@sit-onyx/headless": minor
+---
+
+Enable export of headless testing util

packages/headless/package.json

@@ -11,10 +11,13 @@
   "exports": {
     ".": {
       "default": "./src/index.ts"
+    },
+    "./playwright": {
+      "default": "./src/playwright.ts"
     }
   },
   "scripts": {
-    "build": "tsc --noEmit",
+    "build": "vue-tsc --build --force",
     "test:components": "playwright install && playwright test"
   },
   "peerDependencies": {

packages/headless/src/composables/comboBox/TestDropdown.ct.tsx

@@ -23,7 +23,7 @@ test("combobox", async ({ mount, page }) => {
 /**
  * Test an implementation of the combobox based on https://w3c.github.io/aria/#combobox
  */
-const comboboxTesting = async (
+export const comboboxTesting = async (
   page: Page,
   listbox: Locator,
   combobox: Locator,

packages/headless/src/playwright.ts

@@ -0,0 +1 @@
+export { comboboxTesting } from "./composables/comboBox/TestDropdown.ct";

packages/headless/tsconfig.json

@@ -5,5 +5,6 @@
   "compilerOptions": {
     "rootDir": "./src",
     "baseUrl": ".",
+    "noEmit": true,
   },
 }

packages/sit-onyx/package.json

@@ -45,6 +45,7 @@
     "@axe-core/playwright": "^4.8.3",
     "@fontsource-variable/source-code-pro": "^5.0.17",
     "@fontsource-variable/source-sans-3": "^5.0.19",
+    "@sit-onyx/headless": "workspace:^",
     "@sit-onyx/storybook-utils": "workspace:^",
     "@storybook/addon-essentials": "^7.6.10",
     "@storybook/blocks": "^7.6.10",