Step 6: tdd-tests

Read First

/AGENTS.md
/docs/ABAQUS_SUBROUTINE_AGENT_DESIGN.md
/docs/ARCHITECTURE.md
/docs/ADR.md
/.codex/skills/abaqus-fortran-tdd/SKILL.md
/docs/requirements/uel-3d-euler-beam.md
/docs/formulations/uel-3d-euler-beam.md
/docs/io-definitions/uel-3d-euler-beam.md
/docs/reference-models/uel-3d-euler-beam.md

Task

Create the no-Abaqus Fortran test files and manifest entries required before production Fortran implementation.

Use the exact paths and test names approved in /docs/reference-models/uel-3d-euler-beam.md. If that document is missing exact paths, mark this step blocked and explain the missing contract.

Expected files should include, unless the reference model document chooses better names:

/tests/fortran/test_uel_3d_euler_beam_stiffness.f90
/tests/fortran/test_uel_3d_euler_beam_transform.f90
/tests/fortran/test_uel_3d_euler_beam_invalid_inputs.f90
/tests/fortran/manifest.json

Write tests before implementation. The tests must encode the accepted formulation and interface contract, including:

Local stiffness matrix numerical checks.
Matrix symmetry.
Basic rigid-body mode or rank sanity where practical.
Orientation transform checks.
Invalid length, invalid orientation, and non-positive property checks.
Wrapper mapping checks if the interface contract defines a no-Abaqus wrapper test.

Run RED evidence. Because production source may not exist yet, the expected RED result is a compile/link failure or targeted failing assertion caused by missing/unimplemented production code. Record the RED command and failure reason in /docs/build-test-reports/uel-3d-euler-beam-red.md.

Do not implement production Fortran in this step except for the minimum non-production test scaffolding needed to express the tests. Do not weaken tests to make RED easier.

Tests To Write First

/tests/fortran/test_uel_3d_euler_beam_stiffness.f90
/tests/fortran/test_uel_3d_euler_beam_transform.f90
/tests/fortran/test_uel_3d_euler_beam_invalid_inputs.f90
/tests/fortran/manifest.json entry or entries for the above tests.

Acceptance Criteria

python -m unittest discover -s scripts -p "test_*.py"
python scripts/validate_reference_artifacts.py
python scripts/validate_fortran.py
python scripts/validate_workspace.py

For this RED step, python scripts/validate_fortran.py may fail only for the expected missing/unimplemented production code reason. The step must still run the Python script tests and reference artifact validation successfully. Record exact RED evidence in /docs/build-test-reports/uel-3d-euler-beam-red.md.

Validation Notes

If no Intel Fortran compiler is available, use HARNESS_FORTRAN_VALIDATION=detect only to record compiler detection evidence, then mark the step blocked if RED compile evidence cannot be produced.
Update /phases/uel-3d-euler-beam/index.json step 6 with completed, error, or blocked and a concrete summary or reason.

Forbidden

Do not add JavaScript/TypeScript/npm fallback.
Do not run Abaqus analyses from this project.
Do not generate reference CSVs.
Do not create production Fortran implementation.
Do not break existing Python harness tests.

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