Keep in mind, this information will be logged as well, so you can query your logs.
Here is a list of test pages for low, medium and high risk categories:
http://urlfiltering.paloaltonetworks.com/test-low-risk
http://urlfiltering.paloaltonetworks.com/test-medium-risk
http://urlfiltering.paloaltonetworks.com/test-high-risk
Here is a list of test pages for malicious categories:
http://urlfiltering.paloaltonetworks.com/test-malware
http://urlfiltering.paloaltonetworks.com/test-phishing
http://urlfiltering.paloaltonetworks.com/test-command-and-control
Here is a list of test pages for newly registered domains:
https://urlfiltering.paloaltonetworks.com/test-newly-registered-domains
Here is a list of test pages non-malicious categories:
http://urlfiltering.paloaltonetworks.com/test-abortion
http://urlfiltering.paloaltonetworks.com/test-abused-drugs
http://urlfiltering.paloaltonetworks.com/test-adult
http://urlfiltering.paloaltonetworks.com/test-alcohol-and-tobacco
http://urlfiltering.paloaltonetworks.com/test-auctions
http://urlfiltering.paloaltonetworks.com/test-business-and-economy
http://urlfiltering.paloaltonetworks.com/test-computer-and-internet-info
http://urlfiltering.paloaltonetworks.com/test-content-delivery-networks
http://urlfiltering.paloaltonetworks.com/test-copyright-infringement
http://urlfiltering.paloaltonetworks.com/test-dating
http://urlfiltering.paloaltonetworks.com/test-dynamic-dns
http://urlfiltering.paloaltonetworks.com/test-educational-institutions
http://urlfiltering.paloaltonetworks.com/test-entertainment-and-arts
http://urlfiltering.paloaltonetworks.com/test-extremism
http://urlfiltering.paloaltonetworks.com/test-financial-services
http://urlfiltering.paloaltonetworks.com/test-gambling
http://urlfiltering.paloaltonetworks.com/test-games
http://urlfiltering.paloaltonetworks.com/test-government
http://urlfiltering.paloaltonetworks.com/test-hacking
http://urlfiltering.paloaltonetworks.com/test-health-and-medicine
http://urlfiltering.paloaltonetworks.com/test-home-and-garden
http://urlfiltering.paloaltonetworks.com/test-hunting-and-fishing
http://urlfiltering.paloaltonetworks.com/test-insufficient-content
http://urlfiltering.paloaltonetworks.com/test-internet-communications-and-telephony
http://urlfiltering.paloaltonetworks.com/test-internet-portals
http://urlfiltering.paloaltonetworks.com/test-job-search
http://urlfiltering.paloaltonetworks.com/test-legal
http://urlfiltering.paloaltonetworks.com/test-military
http://urlfiltering.paloaltonetworks.com/test-motor-vehicles
http://urlfiltering.paloaltonetworks.com/test-music
http://urlfiltering.paloaltonetworks.com/test-news
http://urlfiltering.paloaltonetworks.com/test-nudity
http://urlfiltering.paloaltonetworks.com/test-online-storage-and-backup
http://urlfiltering.paloaltonetworks.com/test-parked
http://urlfiltering.paloaltonetworks.com/test-peer-to-peer
http://urlfiltering.paloaltonetworks.com/test-personal-sites-and-blogs
http://urlfiltering.paloaltonetworks.com/test-philosophy-and-political-advocacy
http://urlfiltering.paloaltonetworks.com/test-private-ip-addresses
http://urlfiltering.paloaltonetworks.com/test-proxy-avoidance-and-anonymizers
http://urlfiltering.paloaltonetworks.com/test-questionable
http://urlfiltering.paloaltonetworks.com/test-real-estate
http://urlfiltering.paloaltonetworks.com/test-recreation-and-hobbies
http://urlfiltering.paloaltonetworks.com/test-reference-and-research
http://urlfiltering.paloaltonetworks.com/test-religion
http://urlfiltering.paloaltonetworks.com/test-search-engines
http://urlfiltering.paloaltonetworks.com/test-sex-education
http://urlfiltering.paloaltonetworks.com/test-shareware-and-freeware
http://urlfiltering.paloaltonetworks.com/test-shopping
http://urlfiltering.paloaltonetworks.com/test-social-networking
http://urlfiltering.paloaltonetworks.com/test-society
http://urlfiltering.paloaltonetworks.com/test-sports
http://urlfiltering.paloaltonetworks.com/test-stock-advice-and-tools
http://urlfiltering.paloaltonetworks.com/test-streaming-media
http://urlfiltering.paloaltonetworks.com/test-swimsuits-and-intimate-apparel
http://urlfiltering.paloaltonetworks.com/test-training-and-tools
http://urlfiltering.paloaltonetworks.com/test-translation
http://urlfiltering.paloaltonetworks.com/test-travel
http://urlfiltering.paloaltonetworks.com/test-unknown
http://urlfiltering.paloaltonetworks.com/test-weapons
http://urlfiltering.paloaltonetworks.com/test-web-advertisements
http://urlfiltering.paloaltonetworks.com/test-web-hosting
http://urlfiltering.paloaltonetworks.com/test-web-based-email
http://urlfiltering.paloaltonetworks.com/test-cryptocurrency
http://urlfiltering.paloaltonetworks.com/test-grayware