Handle the case where all the image data are in the alpha channel (bug 1975719) #2942

	name: Font tests
	on:
	push:
	paths:
	- 'gulpfile.mjs'
	- 'src/**'
	- 'test/test.mjs'
	- 'test/font/**'
	- '.github/workflows/font_tests.yml'
	branches:
	- master
	pull_request:
	paths:
	- 'gulpfile.mjs'
	- 'src/**'
	- 'test/test.mjs'
	- 'test/font/**'
	- '.github/workflows/font_tests.yml'
	branches:
	- master
	workflow_dispatch:
	permissions:
	contents: read

	jobs:
	test:
	name: Test

	strategy:
	fail-fast: false
	matrix:
	node-version: [lts/*]
	os: [windows-latest, ubuntu-latest]

	runs-on: ${{ matrix.os }}

	steps:
	- name: Checkout repository
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: Use Node.js ${{ matrix.node-version }}
	uses: actions/setup-node@v4
	with:
	node-version: ${{ matrix.node-version }}

	- name: Install dependencies
	run: npm ci

	- name: Use Python 3.13
	uses: actions/setup-python@v5
	with:
	python-version: '3.13'
	cache: 'pip'

	- name: Install Fonttools
	run: pip install fonttools

	- name: Run font tests
	run: npx gulp fonttest --headless

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