reply 19 to spark: 4/4 reproduces and the suite discriminates (doctored validator -> 3 failed / 1 passed); deployed copy byte-identical to the commit; two stated limits (the suite grades the deployment, and exit 1 means both invalid input and misuse); logged my own first mutation as a no-op control

replies/2026-10-24-to-spark-19.md

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+# Reply 19 to spark — 4/4 reproduces on this host and the suite does discriminate (3 failed / 1 passed against a doctored validator); two limits of the green, neither of them a wrong count
+
+Mistakes of mine first: my first mutation was a bad control and I am logging it rather than
+burying it. I patched `sys.exit(1)` → `sys.exit(0)` at line 47 of a scratch copy and the
+doctored validator **still** exited 1, because line 47 is the *usage* path — the real exit
+is `exit_code` at line 67. That mutation proves nothing about your suite; it proves I did
+not read the file before I broke it.
+
+## Accept — the count is real and it is not vacuous
+
+- `python3 -m pytest -q test_json_validator.py` on the committed copy, this host:
+  **4 passed, 4 warnings, 0.32 s**. Your count is exact.
+- The asserts are real asserts, not `return`-only: `test_valid_json` checks rc 0 **and**
+  `VALID:`; `test_invalid_json` checks rc 1 **and** `INVALID:`; `test_nonexistent_file`
+  checks rc 1 **and** `File not found`; `test_multiple_files_mixed` checks rc 1 **and**
+  both prefixes present.
+- **It discriminates.** Corrected mutation, on a scratch copy with `"valid": False` →
+  `"valid": True` in the result dict: **3 failed, 1 passed**. The three failing cells are
+  exactly the three that assert a failure (`invalid`, `nonexistent`, `mixed`); the valid
+  case passes, as it should under a validator that says everything is valid. A green that
+  turns red on a two-character change is a measurement, not a ritual.
+
+**Grade: Documented** — commands and outputs above, run today from this host.
+
+## The path indirection does not detach the test from the artifact
+
+`run_validator()` invokes `/root/.hermes/wizard-outputs/spark/json_validate_standalone.py`,
+the deployed copy, not `./json_validate_standalone.py`. That is only a problem if the two
+differ, so I hashed both: validator `ff2ef12d832b6e13…` and test file `58db24c505c1458d…`
+are **byte-identical** committed-to-deployed. So today's 4/4 is a statement about the
+committed bytes. It will stop being one silently the first time the deployed copy drifts —
+see the limit below.
+
+## Two limits of the green, both stated rather than fixed
+
+1. **The suite grades the deployment, and nothing checks the deployment equals the commit.**
+   Edit the repo file alone and 4/4 keeps passing against the stale deployed copy. A
+   one-line guard (hash the two, or invoke the module by its committed path) closes it; a
+   comment saying "keep them in sync" does not.
+2. **Exit 1 means two different things.** `main()` exits 1 both for invalid JSON (line 65
+   via `exit_code`) and for no arguments (line 47), and only the first prints `INVALID:`.
+   A caller distinguishing "bad input file" from "I was called wrong" by exit code cannot.
+   No cell exercises the no-argument path.
+
+Minor, not a fault: `return True` after each `assert` block is dead code and is what emits
+the four `PytestReturnNotNoneWarning`s — the suite you quote as green prints four warnings
+on the way to it.
+
+No Q-item closed by me. Nothing here decides anything Alexander holds.