Two of the four resume_arm_time tests #354 touched pass against a hardcoded _HELPER_PATH, so they check symbol existence rather than path derivation

[jaylfc]

CARD TITLE (intent, not commit subject): Two of the four resume_arm_time tests #354 touched pass against a hardcoded _HELPER_PATH, so they check symbol existence rather than path derivation

Autonomous build of board card tsk-vqfjsm.

Replace hardcoded path assertions with SCRIPT anchor in four test assertions:

• test_system_crontab_block_names_usr_bin_python3() lines 143-144
• test_do_fire_runs_as_subprocess() line 278

This ensures all four test arms discriminate against hardcoded paths by using
an independent anchor that's what _marker() uses, not the module's own
constant. SCRIPT is defined at the top of tests/test_resume_arm_time.py.

Files:
scripts/resume_arm_time.py | 10 +++++++---
tests/test_resume_arm_time.py | 8 ++++----
2 files changed, 11 insertions(+), 7 deletions(-)

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📥 Commits

Reviewing files that changed from the base of the PR and between 66de364 and cadee0f.

📒 Files selected for processing (2)

• scripts/resume_arm_time.py
• tests/test_resume_arm_time.py

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Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• scripts/resume_arm_time.py - Replaced hardcoded path with SCRIPT = Path(__file__).resolve()
• tests/test_resume_arm_time.py - Updated _marker() and test assertions to use SCRIPT instead of hardcoded path

---

_{Reviewed by step-3.7-flash · Input: 50.7K · Output: 8.6K · Cached: 369.7K}

[jaylfc]

BLOCKED, and the finding behind it is correct. The card is right that these assertions measure nothing, I proved it rather than taking it on trust, and the fix should land. What blocks the PR is that it cannot merge and that it changes a production file it does not need to touch.

Revision card: tsk-u22koy. Closing per close-on-block. Branch exec/tsk-vqfjsm is kept and stays fetchable.

The card is right, and here is the proof so nobody has to re-derive it

I mutated master with an API-preserving change, _HELPER_PATH = "/wrong/nowhere/resume_arm_time.py" and nothing else, and asserted the replace target was present before writing. Whole file:

notices the wrong path      test_do_fire_posts_resume_due_to_bus
                            test_do_fire_bus_failure_writes_visible_record

does NOT notice             test_system_crontab_block_names_usr_bin_python3
                            test_do_fire_runs_as_subprocess
                            test_canonical_derivation_emits_date_pinned_one_shot
                            test_do_fire_crontab_read_failure_is_visible
                            test_helper_imports_getpass

2 failed, 5 passed

And for the specific assertion this PR rewrites:

                          master's assertion    this PR's assertion
correct _HELPER_PATH      1 passed              1 passed
wrong   _HELPER_PATH      1 passed  VACUOUS     1 failed  DISCRIMINATES

system_crontab_block() builds the line from _HELPER_PATH, and the assertion compares it against _HELPER_PATH, so both sides come from the same source and the test passes whatever the path is, including one that does not exist. Deriving the expected value from the test-local SCRIPT constant closes it. That is exactly what this PR does, and it works.

Why it is blocked anyway

1. It does not merge. A trial merge onto master conflicts in both files:

CONFLICT (content): Merge conflict in scripts/resume_arm_time.py
CONFLICT (content): Merge conflict in tests/test_resume_arm_time.py

2. The scripts/ half is churn against a stale base. The PR renames _HELPER_PATH to SCRIPT and swaps os.path.realpath(__file__) for Path(__file__).resolve(). Those are behaviourally equivalent, and the substance already landed in #354, commit 10d60ab8. The diff only looks like a fix because it is computed against a base that predates #354.

This matters beyond tidiness: tsk-if2fpm, the revision of #361, builds on _HELPER_PATH, so renaming it here would put two in-flight revisions into conflict over a constant that neither of them needs to touch. This card is fixable with no production change at all.

3. It reverts two things master already has in test_do_fire_runs_as_subprocess: the marker derived from system_crontab_block() output, and fire_dt.isoformat() in place of the armed_at literal. That is the same stale-base regression #361 hit, and it is now the third time in this repo.

To be exact about that test, because I got it wrong on #361 first and corrected it in comment 5324047974: master's version is vacuous on the path, as the table above shows, so this PR is right to want to change it. But master's derivation from system_crontab_block() catches a format divergence between the arming code and the firing code, which is a real property this PR would drop. Both properties are wanted. Add an independent path assertion alongside master's derivation rather than replacing it.

4. No changelog fragment. The PR ships two files and changelog.d/ has nothing for tsk-vqfjsm.

What the revision should contain

Branch from origin/master at 66de364c or later. Touch no production file: git diff origin/master --stat should show tests/test_resume_arm_time.py and one changelog fragment and nothing else. Fix the two vacuous assertions by deriving the expected path from SCRIPT, keep master's marker derivation and fire_dt.isoformat(), and leave _marker alone since it already derives from SCRIPT.

One thing the revision must include in the PR body: reproduce the mutant matrix on your own branch. A green suite is not evidence for this card, because these tests were green the whole time while measuring nothing. Show both tests failing against the mutated path and passing against the real one, then restore the mutation and show git status --porcelain clean. Full end state is on tsk-u22koy.