Hear, hear! Not using the Oxford Comma ranks with asinine behavior such as not using a turn signal or standing on an escalator. An excellent example of the problem with omitting the Oxford Comma can be found in a line from an actual Times of London story: "Highlights of his global tour include encounters with Nelson Mandela, an 800-year-old demigod and a dildo collector." Without the comma after "demigod", the sentence can certainly take on an unintended meaning. The Oxford Comma never causes any harm, but can often offer clarity. LONG LIVE THE OXFORD COMMA!!!!!

Quick pointer for those who are not finding the test results to provide sufficient information. Without knowing what information was actually being passed to many of the tests, I was struggling to correct issues with my code. So I began running the tests in pairs - once with my actual code, and a second time with a function that concluded simply with "return url". I cut and pasted the results of the first test into a text editor so that I could more easily compare the expected and actual results, and also copied the results of the second test - the url that had been passed into the testing function.