Found (report-only) by the Wave B migration gates, 2026-07-07: tests/parallel/ptest_004_nodal_swarm_advection.py fails identically on unmodified development (pre-Wave-B baseline) and after the migration — the failure predates the wave and is not caused by it.
Symptom: DuDt._nswarm_psi is None when the script exercises nodal-swarm advection — the script was not updated across the ddt refactors (#310 rewrote the Lagrangian history handling; the NodalPointSwarm path was deprecated in #323).
Likely resolutions: update the script to the current DDt API, or retire it if its coverage is duplicated by test_0765/test_0766 — decide against the NodalPointSwarm deprecation timeline (D5: delete next cycle).
Related: #314 (np4 test_0760 global_evaluate hang, separate pre-existing condition reproduced during the same gates).
Underworld development team with AI support from Claude Code
Found (report-only) by the Wave B migration gates, 2026-07-07:
tests/parallel/ptest_004_nodal_swarm_advection.pyfails identically on unmodifieddevelopment(pre-Wave-B baseline) and after the migration — the failure predates the wave and is not caused by it.Symptom:
DuDt._nswarm_psiisNonewhen the script exercises nodal-swarm advection — the script was not updated across the ddt refactors (#310 rewrote the Lagrangian history handling; the NodalPointSwarm path was deprecated in #323).Likely resolutions: update the script to the current DDt API, or retire it if its coverage is duplicated by
test_0765/test_0766— decide against the NodalPointSwarm deprecation timeline (D5: delete next cycle).Related: #314 (np4
test_0760global_evaluate hang, separate pre-existing condition reproduced during the same gates).Underworld development team with AI support from Claude Code