wkorando

	@Test
	public void testInfo(TestInfo testInfo) {
		assertAll(() -> throwerrors("Just throwing"),
				() -> throwerrors("Some random"),
				() -> throwerrors("errors"));
	}
	
	public void throwerrors(String message) {
		throw new RuntimeException(message);
	}

wkorando

@Component
public class SpringBootVersion implements InfoContributor {
	@Override
	public void contribute(Builder builder) {
		try {
			Manifest mf = new Manifest();
			mf.read(Thread.currentThread().getContextClassLoader().getResourceAsStream("META-INF/MANIFEST.MF"));

			Attributes atts = mf.getMainAttributes();

wkorando

<configuration>
	<appender name="static-appender" class="com.bk.logging.StaticAppender" />

	<root level="trace">
		<appender-ref ref="static-appender" />
	</root>
</configuration>

wkorando

public class TestStaticAppender {

	@BeforeEach
	public void clearLoggingStatements() {
		StaticAppender.clearEvents();
	}

	@Test
	public void testAssertingLoggingStatementsA() {
		LogProducingService service = new LogProducingService();

wkorando

public class StaticAppender extends AppenderBase<ILoggingEvent> {
	static List<ILoggingEvent> events = new ArrayList<>();

	@Override
	public void append(ILoggingEvent e) {
		events.add(e);
	}

	public static List<ILoggingEvent> getEvents() {
		return events;

wkorando

public class LogProducingService {

	private static final Logger LOGGER = LoggerFactory.getLogger(LogProducingService.class);

	public void writeSomeLoggingStatements(String message) {
		LOGGER.info("Let's assert some logs! " + message);
		ExecutorService executor = Executors.newSingleThreadExecutor();
		Future<?> future = executor.submit(() -> LOGGER.info("This message is in a separate thread"));
		do {
			// wait for future to complete

wkorando

public class TestThreadSafeAppender {
	@BeforeEach
	public void clearLoggingStatements() {
		ThreadSafeAppender.clearEvents();
	}

	@Test
	public void testAssertingLoggingStatementsA() {
		LogProducingService service = new LogProducingService();
		service.writeSomeLoggingStatements("A");

wkorando

<project xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
...
	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-surefire-plugin</artifactId>
				<version>2.22.0</version>

wkorando

<configuration>
	<appender name="threadsafe-appender" class="com.bk.logging.ThreadSafeAppender" />

	<root level="trace">
		<appender-ref ref="threadsafe-appender" />
	</root>
</configuration>

wkorando

public class ThreadSafeAppender extends AppenderBase<ILoggingEvent> {
	static ThreadLocal<List<ILoggingEvent>> threadLocal = new ThreadLocal<>();

	@Override
	public void append(ILoggingEvent e) {
		List<ILoggingEvent> events = threadLocal.get();
		if (events == null) {
			events = new ArrayList<>();
			threadLocal.set(events);
		}