[timlichtenberg]

Description

test_seeded_low_h_cold_start_returns_the_physical_root pins the surface pressure of a seeded low-H cold start at 24.8673 bar. That value holds for the Fischer IW buffer, the default of the released CALLIOPE 26.10.5. CALLIOPE main uses the Hirschmann (2021) buffer by default, and there the same cold start gives 25.0959 bar, so the test fails once PROTEUS runs against the next CALLIOPE release.

The test now reads calliope.oxygen_fugacity.DEFAULT_FO2_MODEL of the installed CALLIOPE and expects the pin of that buffer (relative tolerance 1e-4, as before). A buffer without a pin fails the test by name. A second test checks that the tolerance tells the 2 pins apart; they differ by 0.92 % (25.0959 / 24.8673 - 1). PROTEUS has no config key that selects the IW buffer on the CALLIOPE path, so the default of the installed CALLIOPE is the buffer the cold start uses.

Tests only; no source change. This lets PROTEUS main pass with both CALLIOPE 26.10.5 and the next CALLIOPE release, which includes FormingWorlds/CALLIOPE#47.

No related issue.

Validation of changes

• Released CALLIOPE 26.10.5 (Fischer): nightly at 4e5c87b, all jobs green, with fwl_calliope-26.10.5 installed and both tests of this file passed on macOS and Ubuntu: https://github.com/FormingWorlds/PROTEUS/actions/runs/42447222675. The last commit (de1a9a3) changes only a comment and the name and docstring of the second test.
• CALLIOPE main at FormingWorlds/CALLIOPE@41901b6 (Hirschmann), macOS arm64, Python 3.12, PROTEUS and CALLIOPE taken from their checkouts with the module paths checked in the same session: pytest tests/outgas/test_calliope_cold_start_smoke.py gives 5 passed at de1a9a3. The version of this file on main gives 1 failed and 3 passed against the same CALLIOPE.
• Not checked: a CALLIOPE whose default buffer is oneill, which has no pin; the test then fails and names the buffer.

Lines by category (pr-breakdown 9b8e860 de1a9a3):

Category	Files	Lines added / removed	Size on disk (KiB)	Compressed (KiB)
tests	1	+23 / -1	+1.0	+0.4

Checklist

• I have followed the contributing guidelines
• My code follows the style guidelines of this project
• I have performed a self-review of my code
• My changes generate no new warnings or errors
• I have checked that the tests still pass on my computer
• I have updated the docs, as appropriate
• I have added tests for these changes, as appropriate
• I have checked that all dependencies have been updated, as required

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.82%. Comparing base (9b8e860) to head (9c1f713).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1075   +/-   ##
=======================================
  Coverage   94.82%   94.82%           
=======================================
  Files         148      148           
  Lines       24928    24928           
  Branches     4171     4171           
=======================================
  Hits        23638    23638           
  Misses        861      861           
  Partials      429      429           

Flag	Coverage Δ
unit-tests	93.79% <ø> (ø)

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