Add testing on Windows, macOS, and R 4.2 #4

	name: "Testing - Linux"

	on:
	push:
	branches:
	- main
	pull_request:

	jobs:

	linux:
	runs-on: ubuntu-latest
	name: "Unit Tests on Linux (rust: ${{ matrix.config.rust }})"
	strategy:
	fail-fast: false
	matrix:
	config:
	- { rust: 'stable' }
	- { rust: 'nightly' }
	timeout-minutes: 30
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	steps:
	- uses: actions/checkout@v4

	- uses: dtolnay/rust-toolchain@nightly
	if: matrix.config.rust == 'nightly'

	- uses: r-lib/actions/setup-r@v2
	with:
	use-public-rspm: true

	- name: Setup Build Environment
	run: \|
	sudo apt-get update
	sudo apt-get install -y build-essential libsodium-dev

	# Unit tests "automatically" find and set `R_HOME` if it isn't set by
	# calling `R RHOME`. See the testing version of `start_r()` for this.
	- name: Run Unit Tests
	id: test
	run: \|
	cargo test --verbose

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