FEniCS / ffcx / 32308198286

85%

main: 85%

Pull #867

github

Add golden-master numeric test for HyperElasticity's cell kernels

The demo's residual and Jacobian forms (P2 vector displacement, nonlinear
strain energy, Jacobian built via ufl.derivative()) are the deepest-nested
tensor composition anywhere in the test/demo corpus, and had zero numeric
correctness coverage -- demo/test_demos.py only checks that the demo
compiles, never asserts a result. Any future change to how nested tensor
expressions get scalarized or factorized had nothing to catch a silent
wrong-value regression against.

Freezes the current compiler's output for both cell kernels against fixed,
deterministic, non-degenerate coefficient/constant/coordinate data (stored in
test/data/hyperelasticity_golden.npz alongside the inputs, so the fixture is
self-contained and reproducible). Verified the check actually catches a
regression by perturbing one frozen value and confirming the test fails with
a clear mismatch report, then restoring it.

305 of 318 new or added lines in 4 files covered. (95.91%)

4505 of 5270 relevant lines covered (85.48%)

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