feat(print): throw unsupported operation when content area is empty #3541

	# This workflow will do a clean install of node dependencies, cache/restore them, build the source code and run tests across different versions of node
	# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions

	name: Unit tests

	env:
	FORCE_COLOR: 3

	on:
	merge_group:
	pull_request:
	push:
	branches: 'main'

	concurrency:
	group: ${{ github.workflow }}-${{ github.head_ref \|\| github.run_id }}
	cancel-in-progress: true

	jobs:
	unit:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
	- name: Set up Node.js
	uses: actions/setup-node@64ed1c7eab4cce3362f8c340dee64e5eaeef8f7c # v3.6.0
	with:
	node-version: 16
	cache: npm
	- uses: google/wireit@f3a3c79c553122e2fe5829eeac7d815326502903 # setup-github-actions-caching/v1
	- name: Install and build npm dependencies
	run: npm ci
	- name: Verify mapper size
	run: du -sh lib/iife/mapperTab.js
	- name: Run unit tests with coverage
	run: npx nyc --reporter=lcov npm run unit && npx codecov
	- name: Upload coverage reports to Codecov
	uses: codecov/codecov-action@eaaf4bedf32dbdc6b720b63067d99c4d77d6047d # v3.1.4
	with:
	token: ${{ secrets.CODECOV_TOKEN }}

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