There is an Idea on the exchange about a test URL which was going to be implemented, but now it's quiet. Someone also posted about the AMTSO phishing test URL, but the 2014 webfiltering does not block it.
Joe mentions there is a test URL but it may be for internal testing only:
http://www.wilderssecurity.com/showpost.php?p=2304888&postcount=199
Test URL for Webshield
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