#2397 better failing test

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@19185 b5f69653-2bf5-0310-8201-b0dafb8e1405
ticket:1219 for #2016 - remove uses of variable length arrays, and add a compiler warning to stop more creeping in.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@19186 b5f69653-2bf5-0310-8201-b0dafb8e1405