All current HLSCM tests go through the top-level Compute() API. Three internal components — buildHierarchy, prolongateUVs, and solveLSCMLevel — are each 100–200 lines with complex invariants. They are public template functions in detail::hlscm and are directly testable. Without isolation tests, failures are difficult to diagnose.

Items

• buildHierarchy: Verify level count, vertex counts at each level, that pinned vertices survive decimation, and that localToOriginal/originalToLocal are consistent.
• prolongateUVs: Verify that each collapsed vertex's UV is correctly reconstructed from its barycentric coordinates. Test the edge case where containingTri = {vKeep, vKeep, vKeep}.
• solveLSCMLevel: Verify that the solver produces correct UVs on a small known mesh (e.g. pyramid), and that pinned vertices retain their prescribed UV positions.
• MultiLevelHierarchy test: Currently infers multi-level was triggered indirectly. Expose the level count from buildHierarchy or add a test hook, and assert directly.

Dependencies

• Depends on F1 (HLSCM) being merged