# Row 72 (#1566): Claude pin tests, candidate packet, round 1

Author: Rocko. Reviewer: Filbert. Brief:
`docs/plans/2026-10-11_claude-pin-and-coder-grant.md`, section "Claude pin
tests: a directory pin, a symlink default, a pin with a space". Base:
`a0080da8` (`base.txt`). At 2026-10-11T23:03Z the checkout HEAD `ebd90554`
has no change since the base to either test file, `bus-service.sh` or
`adapter.sh`, and `build.patch` applies to it cleanly. Tests only: no
change to `bus-service.sh`, `adapter.sh`, the launcher or the session code.
The packet is uncommitted. I made no commits, pushes or Gitea calls and read
no token or private binding.

## Files (`files.txt`, `candidate-manifest.sha256`)

| File | Change |
|---|---|
| `packages/cli/tests/host.test.mjs` | +1 test: "bus-service.sh refuses a directory pin and keeps a symlink default unresolved" |
| `packages/harness/tests/claude-session.test.mjs` | +1 test: "claude adapter: a directory pin exits 2 before it runs; a pin with a space runs" |
| `agents/rocko/work/queue-72/mutants.sh` | the mutant rerun, so a reviewer can repeat it: `mutants.sh <tree>` |

## What the tests check

- `render --claude DIR` (a 0755 directory) exits 1 with "not an executable
  file" and prints nothing on stdout.
- **Deviation from the brief: the default with a directory named `claude` on
  `PATH`.** The brief says it refuses with "not an executable file". That
  can't happen: bash's `command -v` never returns a directory. With
  only a directory named `claude` on PATH it finds nothing (rc 1); with
  `/usr/bin` behind it, it returns `/usr/bin/claude`. So the default goes down
  the "no claude on PATH" branch: exit 0, a comment, no pin. The test
  asserts that, and that the directory's path never reaches the unit. The
  code is not wrong. The hazard the brief names, a unit carrying a directory
  pin, can't come from the default, only from `--claude`, and the first case
  covers that. I checked this by hand before writing the test (`env -i`, PATH
  of only the directory plus the tools).
- The default with a symlink named `claude` on PATH, pointing to an
  executable in another directory: `MOSAIC_CLAUDE_BIN` is the link's path,
  and the target's path appears nowhere in the unit.
- Adapter, `MOSAIC_CLAUDE_BIN` a directory: exit 2 with "MOSAIC_CLAUDE_BIN is
  not an executable file", and the stand-in on PATH never runs.
- Adapter, a stand-in at `<dir>/Claude Code/claude`: exit 0, and that
  stand-in is the one that ran.

The host test runs bash with a PATH of only the test directory and a tools
directory (node, dirname, sed, readlink), as row 68's no-claude case does, so
the host's own claude can't stand in. No test spawns a real claude.

## Mutants (`out/mutants-candidate.txt`, `out/mutants-base.txt`)

The reviewers' comments name the mutants but don't write them out on the
checkout, so `mutants.sh` defines each from the brief's description:

| Mutant | Edit | Base `a0080da8` | Candidate |
|---|---|---|---|
| `bs-no-f` | bus-service `claude_line`: `[ -f "$bin" ]` → `[ -e "$bin" ]` | survived | killed (host directory-pin test) |
| `bs-x-only` | bus-service: only `[ -x "$bin" ]` | survived | killed (host) |
| `ad-no-f` | adapter: `[ -f "$MOSAIC_CLAUDE_BIN" ]` → `[ -e … ]` | survived | killed (adapter test) |
| `ad-x-only` | adapter: only `[ -x "$MOSAIC_CLAUDE_BIN" ]` | survived | killed (adapter) |
| `bs-resolve-default` | bus-service: default `bin` passed through `readlink -f` | survived | killed (host symlink case) |
| `ad-unquoted-run` | adapter: `"$CLAUDE" -p` → `$CLAUDE -p` | survived | killed (adapter space case) |

Per mutant, the script checks that the sed changed the file, saves the
diff, runs the five pin tests, then restores the file from git. Before
mutating, it refuses if either file is already modified or if the unmutated
run fails. `out/mutants-candidate/` and `out/mutants-base/` hold each
mutant's diff and log.

## Gate (`out/gate/`, sequential, scratch worktree at a0080da8 with the patch, `node_modules` linked)

| Suite | Result |
|---|---|
| cli `node --test 'packages/cli/tests/*.test.mjs'` | 113 pass, 0 fail |
| harness `node --test 'packages/harness/tests/*.test.mjs'` | 58 pass, 0 fail, 0 skipped (claude on PATH) |
| test-auth | 15 passed, 0 failed |
| test-conductor | 17 passed, 0 failed |
| test-config | 24 passed, 0 failed |
| test-discord | 66 passed, 0 failed |
| test-extension-package | 18 passed, 0 failed |
| test-foundation | 44 passed, 0 failed |
| test-queue | 27 passed, 0 failed |
| test-release | 14 passed, 0 failed |
| test-task | 98 passed, 0 failed (Docker) |

After the gate I removed the `rocko-r72_default` network.