Videos results:
http://lh3.ggpht.com/-AJ2TxGubWJ8/Trga9UdtARI/AAAAAAAAI6o/t2q8wJSVJR0/test-videos-results.png

News results:
http://lh6.ggpht.com/-CPOa7NJL2e0/Trga9BHBdjI/AAAAAAAAI6s/4gT099rcn4Y/test-news-results.png

Videos results pages:
http://lh3.ggpht.com/-kISrrutpRyY/Trga9M-CWzI/AAAAAAAAI6k/SUWZJAUMJuA/test-videos-results-page.png

Original size:

lh3.ggpht.com/-AJ2TxGubWJ8/Trga9UdtARI/AAAAAAAAI6o/t2q8wJSVJR0/test-videos-results.png

lh6.ggpht.com/-CPOa7NJL2e0/Trga9BHBdjI/AAAAAAAAI6s/4gT099rcn4Y/test-news-results.png

lh3.ggpht.com/-kISrrutpRyY/Trga9M-CWzI/AAAAAAAAI6k/SUWZJAUMJuA/test-videos-results-page.png

I found 17 tests. You can see here: http://tecno-net.blogspot.com/2011/11/google-hace-mas-de-15-tests-en-su.html