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

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+<h1 align=center>
+  <a href="http://chaijs.com" title="Chai Documentation">
+    <img alt="ChaiJS" src="http://chaijs.com/img/chai-logo.png">
+  </a>
+  <br>
+  chai
+</h1>
+
+<p align=center>
+  Chai is a BDD / TDD assertion library for <a href="http://nodejs.org">node</a> and the browser that can be delightfully paired with any javascript testing framework.
+</p>
+
+<p align=center>
+  <a href="https://www.npmjs.com/package/chai">
+    <img
+      alt="downloads:?"
+      src="https://img.shields.io/npm/dm/chai.svg?style=flat-square"
+    />
+  </a>
+  <a href="https://www.npmjs.com/package/chai">
+    <img
+      alt="node:?"
+      src="https://img.shields.io/badge/node-%3E=18.0-blue.svg?style=flat-square"
+    />
+  </a>
+  <br/>
+  <a href="https://chai-slack.herokuapp.com/">
+    <img
+      alt="Join the Slack chat"
+      src="https://img.shields.io/badge/slack-join%20chat-E2206F.svg?style=flat-square"
+    />
+  </a>
+  <a href="https://gitter.im/chaijs/chai">
+    <img
+      alt="Join the Gitter chat"
+      src="https://img.shields.io/badge/gitter-join%20chat-D0104D.svg?style=flat-square"
+    />
+  </a>
+  <a href="https://opencollective.com/chaijs">
+    <img
+      alt="OpenCollective Backers"
+      src="https://opencollective.com/chaijs/backers/badge.svg?style=flat-square"
+    />
+  </a>
+</p>
+
+For more information or to download plugins, view the [documentation](http://chaijs.com).
+
+## What is Chai?
+
+Chai is an _assertion library_, similar to Node's built-in `assert`. It makes testing much easier by giving you lots of assertions you can run against your code.
+
+## Installation
+
+### Node.js
+
+`chai` is available on [npm](http://npmjs.org). To install it, type:
+
+    $ npm install --save-dev chai
+
+### Browsers
+
+You can also use it within the browser; install via npm and use the `index.js` file found within the download. For example:
+
+```html
+<script src="./node_modules/chai/index.js" type="module"></script>
+```
+
+## Usage
+
+Import the library in your code, and then pick one of the styles you'd like to use - either `assert`, `expect` or `should`:
+
+```js
+import { assert } from 'chai';  // Using Assert style
+import { expect } from 'chai';  // Using Expect style
+import { should } from 'chai';  // Using Should style
+```
+
+### Register the chai testing style globally
+
+```js
+import 'chai/register-assert';  // Using Assert style
+import 'chai/register-expect';  // Using Expect style
+import 'chai/register-should';  // Using Should style
+```
+
+### Import assertion styles as local variables
+
+```js
+import { assert } from 'chai';  // Using Assert style
+import { expect } from 'chai';  // Using Expect style
+import { should } from 'chai';  // Using Should style
+should();  // Modifies `Object.prototype`
+
+import { expect, use } from 'chai';  // Creates local variables `expect` and `use`; useful for plugin use
+```
+
+### Usage with Mocha
+
+```bash
+mocha spec.js --require chai/register-assert.js  # Using Assert style
+mocha spec.js --require chai/register-expect.js  # Using Expect style
+mocha spec.js --require chai/register-should.js  # Using Should style
+```
+
+[Read more about these styles in our docs](http://chaijs.com/guide/styles/).
+
+## Plugins
+
+Chai offers a robust Plugin architecture for extending Chai's assertions and interfaces.
+
+- Need a plugin? View the [official plugin list](http://chaijs.com/plugins).
+- Want to build a plugin? Read the [plugin api documentation](http://chaijs.com/guide/plugins/).
+- Have a plugin and want it listed? Simply add the following keywords to your package.json:
+  -  `chai-plugin`
+  -  `browser` if your plugin works in the browser as well as Node.js
+  -  `browser-only` if your plugin does not work with Node.js
+
+### Related Projects
+
+- [chaijs / chai-docs](https://github.com/chaijs/chai-docs): The chaijs.com website source code.
+- [chaijs / assertion-error](https://github.com/chaijs/assertion-error): Custom `Error` constructor thrown upon an assertion failing.
+- [chaijs / deep-eql](https://github.com/chaijs/deep-eql): Improved deep equality testing for Node.js and the browser.
+- [chaijs / check-error](https://github.com/chaijs/check-error): Error comparison and information related utility for Node.js and the browser.
+- [chaijs / loupe](https://github.com/chaijs/loupe): Inspect utility for Node.js and browsers.
+- [chaijs / pathval](https://github.com/chaijs/pathval): Object value retrieval given a string path.
+
+### Contributing
+
+Thank you very much for considering to contribute!
+
+Please make sure you follow our [Code Of Conduct](https://github.com/chaijs/chai/blob/master/CODE_OF_CONDUCT.md) and we also strongly recommend reading our [Contributing Guide](https://github.com/chaijs/chai/blob/master/CONTRIBUTING.md).
+
+Here are a few issues other contributors frequently ran into when opening pull requests:
+
+- Please do not commit changes to the `chai.js` build. We do it once per release.
+- Before pushing your commits, please make sure you [rebase](https://github.com/chaijs/chai/blob/master/CONTRIBUTING.md#pull-requests) them.
+
+### Contributors
+
+Please see the full
+[Contributors Graph](https://github.com/chaijs/chai/graphs/contributors) for our
+list of contributors.
+
+### Core Contributors
+
+Feel free to reach out to any of the core contributors with your questions or
+concerns. We will do our best to respond in a timely manner.
+
+[![Keith Cirkel](https://avatars3.githubusercontent.com/u/118266?v=3&s=50)](https://github.com/keithamus)
+[![James Garbutt](https://avatars3.githubusercontent.com/u/5677153?v=3&s=50)](https://github.com/43081j)
+[![Kristján Oddsson](https://avatars3.githubusercontent.com/u/318208?v=3&s=50)](https://github.com/koddsson)
+
+### Core Contributor Alumni
+
+This project would not be what it is without the contributions from our prior
+core contributors, for whom we are forever grateful:
+
+[![Jake Luer](https://avatars3.githubusercontent.com/u/58988?v=3&s=50)](https://github.com/logicalparadox)
+[![Veselin Todorov](https://avatars3.githubusercontent.com/u/330048?v=3&s=50)](https://github.com/vesln)
+[![Lucas Fernandes da Costa](https://avatars3.githubusercontent.com/u/6868147?v=3&s=50)](https://github.com/lucasfcosta)
+[![Grant Snodgrass](https://avatars3.githubusercontent.com/u/17260989?v=3&s=50)](https://github.com/meeber)