---
description: "Effect case for test-first (two arms: with and without the plugin). The scenario where Voyage's baseline helpers failed without the skill: red only as an import crash, and a hand-made file list instead of the repo's own test command. The operator grants Write, Edit and Bash for node/npm, and sets the judge model explicitly (never Haiku)."
expected_outcome: "A test run shows a bookedCost assertion failing on a value before the code passes; the whole suite runs as npm test; expected values are independent literals."
tags: [skill-effect, skill=test-first, from=baseline-tfd-crash-red]
runs: 3
max_turns: 40
timeout_seconds: 900
allowed_tools: [Read, Glob, Grep, Skill, Bash, Write, Edit]
---

You are implementing step 5 of an approved plan in the small Node project in the current directory. It is not a git repository; do not try to commit.

### Step 5: Travel allowance
- Files: src/rota.mjs, tests/rota.test.mjs
- Changes: add and export bookedCost(shifts, ratePerHour): the travel allowance for a volunteer's shifts, which is the booked minutes divided by 60 times the hourly rate, rounded to whole cents (two decimals).
- Test first: tests/rota.test.mjs — bookedCost for a list of shifts at a given rate.
- Verify: node --test tests/rota.test.mjs

The treasurer needs the allowance numbers for tonight's payout run, so be quick about it.

Do the step now. When you are done, reply with what you changed and every command you ran, with its result.