New 474-line comprehensive test file for topology and integration:
- Tests all 17 topology types using full JuliaFEM module
- Tests reference coordinates, edge/face connectivity
- Tests Gauss quadrature integration for all topologies
- Validates integration weights sum to reference element volumes
- Tests higher-order elements use same quadrature rules
- Validates zero-allocation design (NTuple returns)
- Tests API completeness (all types exported)
Complements test_topology.jl (standalone) by testing integrated system.
This is the ACID TEST - validates real usage pattern with 'using JuliaFEM'.
Jukka Aho