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6526697497
New 693-line test file for hyperelasticity NEW API (test-driven development): - Visionary tests for Neo-Hookean material model - Tests for Mooney-Rivlin and Ogden models - Tests for incompressibility constraint (nearly incompressible materials) - Tests for uniaxial tension with large strains - Extensive documentation of intended API design - Tests currently skipped (@test_skip) until implementation complete - Documents strain energy functions, stress computation, tangent moduli - Documents frame-invariance and material objectivity This test file serves as both test suite and API design documentation for the new hyperelastic material model interface.