This original tutorial material has been substantially updated and expanded for Seaside 3.0 (by Michael Davies, Stephane Ducasse, Lukas Renggli, and Rick Zaccone) into a Freely available Seaside book. Please update your links to point to http://book.seaside.st.
I still maintain the
chapter here because it was dropped from the book. This "testing" chapter has not been updated to reflect changes in Seaside or changes in SeasideTesting but it expect an update very soon.