[AxelNoun]

Problem

The tests workflow has failed on every push to master from 85ff1e9 onwards (three pushes on 27 Aug 2026: runs 33060297832, 33061204738 and 33062233765). In each run, the Python 3.11 job fails on the same three tests, and fail-fast cancels the 3.12 job:

• tests/test_osf_deposit.py::test_snapshot_matches_pinned_hashes
• tests/test_osf_deposit.py::test_manifest_points_at_the_freeze_not_head
• tests/test_osf_deposit.py::test_write_bundle_matches_git

All three fail at git show 0a5e794…:PREREGISTRATION.md, which exits with status 128. actions/checkout@v4 fetches a single commit by default, so the frozen prereg-v1 commit is absent from the CI clone. The other tests pass (117 or 118, depending on the run).

Change

• .github/workflows/tests.yml: fetch-depth: 0 on the checkout step, so that CI has the full history and runs the three tests.
• tests/test_osf_deposit.py: the three tests that read the frozen commit are marked skipif when git cat-file -e 0a5e794…^{commit} fails in the current directory (shallow clone, release zip or tarball without .git, or git not installed). The skip reason names the commit. test_upload_refuses_an_empty_token does not depend on git and is unchanged.

src/, PREREGISTRATION.md, configs/prereg_v1.json and the pinned hashes in osf_deposit.FROZEN_SHA256 are not modified.

Checks run locally

Windows, pytest 9.1.1, Python 3.12.11 (numpy 2.5.3, scipy 1.18.1, ripser 0.6.15) and Python 3.11.15 (numpy 2.4.6, scipy 1.17.1, ripser 0.6.15).

Checkout	Command	3.12	3.11
full clone of this branch	pytest -q	121 passed	121 passed
git clone --depth 1 of this branch	pytest -q -rs	118 passed, 3 skipped (the three tests above)	118 passed, 3 skipped
git archive --format=zip of this branch, extracted	pytest -q -rs tests/test_osf_deposit.py	1 passed, 3 skipped	not run
depth-1 clone with the test file from master (control)	pytest -q on that file	3 failed, 1 passed, with the CI error	not run

The workflow itself was not run locally. In CI on this branch (run 37610801711, commit ba71cc1), both pytest (3.11) and pytest (3.12) report 121 passed and none skipped.

With the skip, a checkout that lacks the frozen commit reports three skipped tests instead of three failures. Consequently, if fetch-depth: 0 were removed later, CI would report these skips rather than fail.