feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

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+# CSS Syntax Patches For CSSTree <img src="https://cssdb.org/images/css.svg" alt="for CSS" width="90" height="90" align="right">
+
+[<img alt="npm version" src="https://img.shields.io/npm/v/@csstools/css-syntax-patches-for-csstree.svg" height="20">][npm-url]
+[<img alt="Build Status" src="https://github.com/csstools/postcss-plugins/actions/workflows/test.yml/badge.svg?branch=main" height="20">][cli-url]
+
+Patch [csstree](https://github.com/csstree/csstree) syntax definitions with the latest data from CSS specifications.  
+
+## Usage
+
+```bash
+npm install @csstools/css-syntax-patches-for-csstree
+```
+
+```js
+import { fork } from 'css-tree';
+import syntax_patches from '@csstools/css-syntax-patches-for-csstree' with { type: 'json' };
+
+const forkedLexer = fork({
+	atrules: syntax_patches.next.atrules,
+	properties: syntax_patches.next.properties,
+	types: syntax_patches.next.types,
+}).lexer;
+```
+
+## `next`
+
+```js
+import syntax_patches from '@csstools/css-syntax-patches-for-csstree' with { type: 'json' };
+
+console.log(syntax_patches.next);
+//                         ^^^^
+```
+
+CSS specifications are often still in flux and various parts might change or disappear altogether.  
+Specifications also contains parts that haven't been implemented yet in a browser.  
+Only CSS that is widely adopted can be expected to be stable.
+
+The `next` grouping contains a combination of what is currently valid in browsers and the progress in various specifications.
+
+_In the future more groupings might be added._
+
+[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
+[npm-url]: https://www.npmjs.com/package/@csstools/css-syntax-patches-for-csstree