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

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diff --git a/vanilla/node_modules/xml-name-validator/README.md b/vanilla/node_modules/xml-name-validator/README.md
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+# Validate XML Names and Qualified Names
+
+This package simply tells you whether or not a string matches the [`Name`](http://www.w3.org/TR/xml/#NT-Name) or [`QName`](http://www.w3.org/TR/xml-names/#NT-QName) productions in the XML Namespaces specification. We use it for implementing the [validate](https://dom.spec.whatwg.org/#validate) algorithm in jsdom, but you can use it for whatever you want.
+
+## Usage
+
+This package's main module exports two functions, `name()` and `qname()`. Both take a string and return a boolean indicating whether or not the string matches the relevant production.
+
+```js
+"use strict":
+const xnv = require("xml-name-validator");
+
+// Will return true
+xnv.name("x");
+xnv.name(":");
+xnv.name("a:0");
+xnv.name("a:b:c");
+
+// Will return false
+xnv.name("\\");
+xnv.name("'");
+xnv.name("0");
+xnv.name("a!");
+
+// Will return true
+xnv.qname("x");
+xnv.qname("a0");
+xnv.qname("a:b");
+
+// Will return false
+xnv.qname(":a");
+xnv.qname(":b");
+xnv.qname("a:b:c");
+xnv.qname("a:0");
+```