TestStaticAppender.java

public class TestStaticAppender {

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

	@Test
	public void testAssertingLoggingStatementsA() {
		LogProducingService service = new LogProducingService();
		service.writeSomeLoggingStatements("A");
		assertThat(StaticAppender.getEvents()).extracting("message").containsOnly("Let's assert some logs! A",
				"This message is in a separate thread");
	}

	@Test
	public void testAssertingLoggingStatementsB() {
		LogProducingService service = new LogProducingService();
		service.writeSomeLoggingStatements("B");
		assertThat(StaticAppender.getEvents()).extracting("message").containsOnly("Let's assert some logs! B",
				"This message is in a separate thread");
	}

}