unit tests, and some cleaning up

node_modules/requires-port/index.js

@@ -0,0 +1,38 @@
+'use strict';
+
+/**
+ * Check if we're required to add a port number.
+ *
+ * @see https://url.spec.whatwg.org/#default-port
+ * @param {Number|String} port Port number we need to check
+ * @param {String} protocol Protocol we need to check against.
+ * @returns {Boolean} Is it a default port for the given protocol
+ * @api private
+ */
+module.exports = function required(port, protocol) {
+  protocol = protocol.split(':')[0];
+  port = +port;
+
+  if (!port) return false;
+
+  switch (protocol) {
+    case 'http':
+    case 'ws':
+    return port !== 80;
+
+    case 'https':
+    case 'wss':
+    return port !== 443;
+
+    case 'ftp':
+    return port !== 21;
+
+    case 'gopher':
+    return port !== 70;
+
+    case 'file':
+    return false;
+  }
+
+  return port !== 0;
+};