I think this is an error that has crept in after upgrading our Xith version. Anyway I removed the line:
and it worked (note to Xith and JOODE people, can we fix this please? ).
Please note that the trimesh test cases are pretty complicated trimesh objects (Disicosidodecahedrons). I found that although the test ran, the physics engine took most of the CPU time so sometimes when I ran the test, I didn't visually see the results (because rendering was deprioritized). However, I have added some degub output so you can see the collisions being caught. Also our trimesh expert is currently optimizing so it all should run faster soon.