feature: Add JUnit 5 unit test suite, JaCoCo coverage, and CI #13

	name: CI

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:
	build-and-test:
	name: Build, test and report coverage
	runs-on: ubuntu-latest

	steps:
	- name: Check out repository
	uses: actions/checkout@v4

	- name: Set up JDK 8
	uses: actions/setup-java@v4
	with:
	distribution: temurin
	java-version: '8'

	- name: Cache Gradle packages
	uses: actions/cache@v4
	with:
	path: \|
	~/.gradle/caches
	~/.gradle/wrapper
	key: ${{ runner.os }}-gradle-${{ hashFiles('*/.gradle', 'gradle/wrapper/gradle-wrapper.properties') }}
	restore-keys: ${{ runner.os }}-gradle-

	- name: Make Gradle wrapper executable
	run: chmod +x ./gradlew

	- name: Run tests with coverage
	run: ./gradlew clean test jacocoTestReport jacocoTestCoverageVerification --no-daemon --stacktrace

	- name: Coverage summary
	if: always()
	run: \|
	REPORT=build/reports/jacoco/test/jacocoTestReport.csv
	if [ -f "$REPORT" ]; then
	awk -F, 'NR>1 { lm += $8; lc += $9 } END {
	total = lm + lc;
	pct = (total > 0) ? lc * 100 / total : 0;
	printf "## JaCoCo coverage\n\n\| Metric \| Value \|\n\|---\|---\|\n\| Lines covered \| %d / %d \|\n\| Line coverage \| %.2f%% \|\n", lc, total, pct
	}' "$REPORT" >> "$GITHUB_STEP_SUMMARY"
	else
	echo "No JaCoCo report found." >> "$GITHUB_STEP_SUMMARY"
	fi

	- name: Upload test results
	if: always()
	uses: actions/upload-artifact@v4
	with:
	name: test-results
	path: build/reports/tests/test

	- name: Upload coverage report
	if: always()
	uses: actions/upload-artifact@v4
	with:
	name: jacoco-coverage-report
	path: build/reports/jacoco/test

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