OCCT

puts "========================================================================"
puts "Bug 33894: unifysamedom crashes on tessellated geometry without surfaces"
puts "No crash expected"
puts "========================================================================"

pload XDE MODELING

stepread [locate_data_file gh624_tessellated_tetrahedron_ap242.step] anInputShape *

# Check what kind of shape we get
checknbshapes anInputShape_1 -t

# Validate shape - will show BRepCheck_NoSurface errors
puts "REQUIRED All: Faulty shapes in variables faulty_1 to faulty_6"
checkshape anInputShape_1

# Unify shapes. No crash expected.
unifysamedom aUnified anInputShape_1

# Check result. 
checknbshapes aUnified -face 4 -shell 1 -solid 1 -shape 6 -t