Step 6: model-beam-topology

Read These Files First

Read the following files before editing:

/AGENTS.md
/docs/ARCHITECTURE.md
/docs/ADR.md
/docs/implementation-plans/euler-beam-3d-implementation-plan.md
/src/fesa/model/element.hpp
/src/fesa/model/element.cpp
/tests/unit/model_element_test.cpp

Task

Use TDD to add a semantic model topology for a two-node 3D beam.

Required production behavior:

Add beam2 to fesa::model::ElementTopology.
Preserve existing truss2, bar2, and unknown behavior.
Do not store equation IDs on Element.
Do not add section constants to Element in this step.

Tests To Write First

Modify /tests/unit/model_element_test.cpp first.

Add a failing assertion that constructs an element with:

id ElementId{10}
topology ElementTopology::beam2
node ids {NodeId{1}, NodeId{2}}
property id PropertyId{7}

The test must verify:

element.topology() == ElementTopology::beam2
element.node_ids().size() == 2
existing bar2 behavior still works or the test still covers it

RED command:

ctest --test-dir build/msvc-debug --output-on-failure -C Debug -R model_element_test

Expected RED: compile failure because ElementTopology::beam2 is not defined.

Then implement the minimal enum addition.

GREEN command:

ctest --test-dir build/msvc-debug --output-on-failure -C Debug -R model_element_test

Acceptance Criteria

ctest --test-dir build/msvc-debug --output-on-failure -C Debug -R model_element_test
python -m unittest discover -s scripts -p "test_*.py"
python scripts/validate_workspace.py

Verification Notes

Confirm the test failed before editing production code.
Confirm no unrelated model refactor was made.
Update phases/euler-beam-3d/index.json step 6:
- success: "status": "completed", "summary": "beam2 model topology added with unit test"
- failure after retries: "status": "error", "error_message": "<specific error>"
- blocked: "status": "blocked", "blocked_reason": "<specific reason>"

Forbidden

Do not create parser code.
Do not add beam stiffness code in this step.

2.1 KiB Raw Blame History