unit testing #77

	name: unit testing
	on: push
	jobs:
	build-and-test:
	runs-on: ubuntu-latest
	steps:
	# Checks out code from Github.
	- name: Checkout repo
	uses: actions/checkout@v2
	# Restore cache if available.
	- name: Restore cached dependencies
	id: dep-cache
	uses: actions/cache@v2
	env:
	cache-name: tlejs-cache
	with:
	path: node_modules
	key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
	restore-keys: \|
	${{ runner.os }}-build-${{ env.cache-name }}-
	${{ runner.os }}-build-
	${{ runner.os }}-
	# Fully install from scratch when no cache is available.
	- name: Install dependencies from scratch (cache miss only)
	if: steps.dep-cache.outputs.cache-hit != 'true'
	run: npm i
	- name: Unit tests
	run: npm test
	shell: bash

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