added unit testing, and started implementing unit tests...phew

node_modules/invert-kv/index.js

@@ -0,0 +1,15 @@
+'use strict';
+module.exports = object => {
+	if (typeof object !== 'object') {
+		throw new TypeError('Expected an object');
+	}
+
+	const ret = {};
+
+	for (const key of Object.keys(object)) {
+		const value = object[key];
+		ret[value] = key;
+	}
+
+	return ret;
+};