Corrected a few typos.  Added invalid url for TestStartWith as it seems ...

...was intended.

Hi. Aside from the typos, TestStartWith tested with an invalid app which I think /should/ throw an error.  This was changed to set input to an invalid url (the string of x's was actually valid) which should not throw an error as stated.

P.S.  This is my first pull request.  I hope it looks good and was done correctly.