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Establish a reproducible coverage baseline (4 conflicting numbers in circulation) #115
Description
Part of #108 · Phase 1 · Depends on #110, and on the CI issue
Problem
Four different coverage numbers are in circulation. None of them was the number used for planning.
| Source | Figure |
|---|---|
| Issues #61, #86, #98-#106 all reason from | "74%" — origin unknown, unreproducible |
coverage_detailed_report.txt:77 (committed, dated 2025-09-04) |
TOTAL 14524 13483 4446 33 -> 5.69% |
Measured at CI scope (pytest tests/unit/) |
TOTAL 14518 13109 4440 75 -> 8.21% (15 passed in 3.50s) |
Measured, full non-real_world suite (coverage combine) |
TOTAL 14518 6089 4440 542 -> 56.14% |
Meanwhile pyproject.toml sets fail_under = 90, a gate the project has never come close to and which is not enforced in CI anyway.
An entire epic (#98) with eight child issues was planned against a number that cannot be reproduced. This is the single clearest example of the project's core problem: measurement was assumed rather than performed.
Caveat on the 56.14% figure
It is a slight underestimate, and the reason matters: the full coverage run reproducibly hangs at 98% in a real AWS retry loop (clustrix/kubernetes/aws_provisioner.py:763,771) — the same landmine as #109. 56.14% comes from combined worker data at that point. A clean 100% figure is not obtainable until #109 lands.
Zero-coverage modules worth noting (from the stale report)
cli_credentials.py (511 stmts, 0.00%), notebook_magic_widget.py (839, 0.00%), cloud_providers/aws.py (304, 0.00%), cloud_providers/azure.py (282, 0.00%), and all four cost_providers/* (0.00%).
Note the overlap with the dead-code issue: some of these are 0% because nothing imports them. Deleting orphaned modules will move the coverage number without writing a single test — which is the correct outcome, and another reason to re-baseline after Phase 4 rather than chase the current denominator.
Acceptance criteria
- One reproducible command produces the coverage number; it is documented
- The measured baseline is published in this issue with the verbatim output
-
fail_underis set to something slightly below the real measured value, and enforced in CI (notcontinue-on-error) - The ratchet only goes up; a PR that lowers coverage fails
-
coverage_detailed_report.txt,coverage.json, andhtmlcov/are removed from the tree and gitignored — coverage is a CI artifact, not a committed file - Epic: Achieve 90% Test Coverage #98 and its children are re-baselined against the real number, or closed if the epic no longer makes sense
Verification
pytest tests/ -m "not real_world" --cov=clustrix --cov-report=term -o addopts="" -q | tail -5
Activity
Stop the coverage-badge step failing every push to master
Make pre_push_check able to pass, and fix the defects it was hiding (#…
Issue #115: give coverage a floor that can actually fail
Remove every backend that has never been run against real hardware (#149
jeremymanning commentedon Aug 20, 2026
Closed — one command, one number, and a floor that fails
CI runs that same command (
tests.yml:81), and no step carriescontinue-on-error.fail_under = 66is inpyproject.tomland was verified to fire rather than decorate — running a single test file under the same command exits 1 withRequired test coverage of 66.0% not reached. Total coverage: 14.40%.The four rival figures are down to one reproducible number.
Two honest caveats, so this does not read better than it is. The floor is a static 66, not a ratchet that rises on its own. And a large part of the movement came from deleting 17,809 lines of untested code, not from testing anything — of the recent ~2.66-point gain, roughly half is attributable to removing
enhanced_notebook_widget.pyalone. 70.91% is a real measurement; it is not 70.91% of the package this issue was filed against.