Add Tests badge to the README #179

	name: Tests

	on:
	push:
	branches:
	- master
	pull_request:

	jobs:
	tests:
	runs-on: ubuntu-latest
	container:
	image: node:18
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	- name: Set up Node.js
	uses: actions/setup-node@v4
	with:
	node-version: '18'
	cache: 'yarn'
	- name: Get yarn cache directory path
	id: yarn-cache-dir-path
	run: echo "dir=$(yarn cache dir)" >> $GITHUB_OUTPUT
	- name: Cache dependencies
	uses: actions/cache@v4
	with:
	path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
	key: dependencies-v1-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
	- name: Install
	run: yarn install --frozen-lockfile --ignore-scripts --prefer-offline
	- name: Linting files
	run: yarn lint
	- name: Unit tests
	run: yarn test --coverage
	- name: Build coverage
	uses: coverallsapp/github-action@master
	with:
	github-token: ${{ secrets.GITHUB_TOKEN }}

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