Jest

Added even more error checks and fixed str with shift hex gen #38

	name: Jest
	on: push
	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Setup Node.js
	uses: actions/setup-node@v1
	with:
	node-version: "16"

	# Speed up subsequent runs with caching
	- name: Cache node modules
	uses: actions/cache@v2
	env:
	cache-name: cache-node-modules
	with:
	# npm cache files are stored in `~/.npm` on Linux/macOS
	path: ~/.npm
	key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
	restore-keys: \|
	${{ runner.os }}-build-${{ env.cache-name }}-
	${{ runner.os }}-build-
	${{ runner.os }}-

	# Install required deps for action
	- name: Install Dependencies
	run: npm install

	# Finally, run our tests
	- name: Run the tests
	run: npm test

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