Coverage #4

	name: Coverage

	on:
	push:
	branches:
	- main
	workflow_dispatch:

	permissions:
	contents: write

	jobs:
	coverage:
	name: Test coverage
	runs-on: ubuntu-latest
	timeout-minutes: 15
	steps:
	- uses: actions/checkout@v4

	- uses: actions/setup-node@v4
	with:
	node-version: 20
	cache: 'npm'

	- name: Install dependencies
	run: npm ci

	- name: Run tests with coverage
	run: npx jest --coverage --coverageReporters=json-summary

	# The README coverage badge reads coverage-summary.json off the
	# `coverage` branch via shields.io's dynamic-JSON endpoint, so this
	# branch holds only that file and is force-pushed on every run.
	- name: Publish summary to coverage branch
	run: \|
	pct=$(node -p "require('./coverage/coverage-summary.json').total.lines.pct")
	mkdir /tmp/pub
	cp coverage/coverage-summary.json /tmp/pub/
	cd /tmp/pub
	git init -b coverage
	git config user.name "github-actions[bot]"
	git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
	git add coverage-summary.json
	git commit -m "coverage: ${pct}% lines ($GITHUB_SHA)"
	git push --force "https://x-access-token:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git" coverage
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

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