Fixed tests broken by the introduction of the Addressable gem in dfc3b50c0a1a7917821ae87fb1947d4dcc152c11 to percent-encode URLs.

Addressable silently adds a trailing slash to URLs without subpath. E.g. "http://www.web.com/feed" is not changed, but "http://www.feed.com" is converted to "http://www.feed.com/". This is probably correct, but breaks some tests which used URLs without trailing slashes, assuming no slash will be added.

The fix is just to assume in tests that for URLs without subpaths, a trailing slash will be added.