JUnit을 사용하여 로그 메시지를 어설션하는 방법은 무엇입니까?

<code class="java">import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.LoggingEvent;
import java.util.ArrayList;
import java.util.List;

public class TestAppender extends AppenderSkeleton {
    private final List<LoggingEvent> log = new ArrayList<>();             

    @Override
    public boolean requiresLayout() {
        return false;
    }

    @Override
    protected void append(final LoggingEvent loggingEvent) {
        log.add(loggingEvent);
    }

    @Override
    public void close() {
    }

    public List<LoggingEvent> getLog() {
        return new ArrayList<>(log);
    }
}</code>

<code class="java">import org.junit.Test;
import org.apache.log4j.Logger;
import static org.junit.Assert.assertThat;
import java.util.List;
import java.util.Level;

public class JUnitLogAssert {

    @Test
    public void test() {
        final TestAppender appender = new TestAppender();
        final Logger logger = Logger.getRootLogger();
        logger.addAppender(appender);

        // Execute code under test that logs messages

        logger.removeAppender(appender);
        final List<LoggingEvent> log = appender.getLog();

        // Assert on the captured log entries
        assertThat(log.get(0).getLevel(), is(Level.INFO));
        assertThat((String) log.get(0).getMessage(), is("Test"));
    }
}</code>