Add CI check running testdouble.js's test suite against quibble #4

	# Advisory integration check: installs this branch's quibble build into a
	# fresh checkout of testdouble.js (quibble's primary consumer) and runs
	# testdouble.js's own test suite against it. This is not a required check -
	# testdouble.js has its own independent sources of flakiness unrelated to
	# quibble - but it's the best available signal for real-world regressions,
	# including ones quibble's own test suite doesn't exercise.

	name: testdouble.js integration

	on:
	push:
	branches: [ "main" ]
	pull_request:
	branches: [ "main" ]

	jobs:
	testdouble:
	continue-on-error: true

	strategy:
	fail-fast: false
	matrix:
	node-version: [16.x, 18.x, 20.x, 22.x, 24.x, current]

	runs-on: ubuntu-latest

	steps:
	- name: Checkout quibble
	uses: actions/checkout@v7
	with:
	path: quibble

	- name: Checkout testdouble.js
	uses: actions/checkout@v7
	with:
	repository: testdouble/testdouble.js
	path: testdouble.js

	- name: Use Node.js ${{ matrix.node-version }}
	uses: actions/setup-node@v7
	with:
	node-version: ${{ matrix.node-version }}

	- name: Pack quibble
	working-directory: quibble
	shell: bash
	run: npm pack --pack-destination "${{ runner.temp }}"

	- name: Install testdouble.js dependencies
	working-directory: testdouble.js
	run: npm ci

	- name: Install this quibble build into testdouble.js
	working-directory: testdouble.js
	shell: bash
	run: \|
	rm -rf node_modules/quibble
	npm install --no-save "$(ls "${{ runner.temp }}"/quibble-*.tgz)"

	- name: Run testdouble.js's test suite
	working-directory: testdouble.js
	run: npm test

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