New 312-line test file for single-element patch test:
- Tests core assembly infrastructure with single Tet10 element
- Validates material model (LinearElastic) stress computation
- Tests strain computation from displacement gradients
- Validates zero-allocation in assembly helpers
- Tests type stability with @inferred checks
- Validates stiffness matrix symmetry and positive definiteness
- Tests uniaxial tension case with known analytical solution
Fundamental validation test isolating assembly implementation
from mesh complexities and solver issues.
Jukka Aho