Upgrade test suite to JUnit 5 #239

	# This workflow will build and test a Java project with Gradle
	# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle

	name: CI

	on:
	push:
	branches:
	- main
	pull_request:
	types:
	- opened
	- synchronize
	- unlabeled
	jobs:
	Java:
	strategy:
	matrix:
	java: ['8','11']

	runs-on: ubuntu-latest

	steps:
	- name: Checkout Repository
	uses: actions/checkout@v3
	- name: Set up JDK
	uses: actions/setup-java@v2
	with:
	java-version: ${{ matrix.java }}
	distribution: 'adopt'
	- name: Grant execute permission for gradlew
	run: chmod +x gradlew
	- name: Build with Gradle
	run: ./gradlew assemble
	- name: Run Tests
	run: ./gradlew check

	slack-on-failure:
	needs: [Java]
	if: failure() && github.ref == 'refs/heads/main'
	runs-on: ubuntu-latest

	steps:
	- uses: 8398a7/action-slack@v3
	with:
	status: failure
	env:
	SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}

Provide feedback