Enhanced protocol parsing implementation to fix #4633; (#4639)

Added unit tests;

Co-authored-by: Jay <jasonsaayman@gmail.com>

test/unit/helpers/parseProtocol.js

@@ -0,0 +1,24 @@
+var assert = require('assert');
+var utils = require('../../../lib/utils');
+var parseProtocol = require('../../../lib/helpers/parseProtocol');
+
+describe('helpers::parseProtocol', function () {
+  it('should parse protocol part if it exists', function () {
+    utils.forEach({
+      'http://username:password@example.com/': 'http',
+      'ftp:google.com': 'ftp',
+      'sms:+15105550101?body=hello%20there': 'sms',
+      'tel:0123456789' : 'tel',
+      '//google.com': '',
+      'google.com': '',
+      'admin://etc/default/grub' : 'admin',
+      'stratum+tcp://server:port': 'stratum+tcp',
+      '/api/resource:customVerb': '',
+      'https://stackoverflow.com/questions/': 'https',
+      'mailto:jsmith@example.com' : 'mailto',
+      'chrome-extension://1234/<pageName>.html' : 'chrome-extension'
+    }, (expectedProtocol, url) => {
+      assert.strictEqual(parseProtocol(url), expectedProtocol);
+    });
+  });
+});