package ch.qos.logback.classic.layout;
   
   
   import org.junit.jupiter.api.BeforeEach;
   
   import ch.qos.logback.classic.Level;
   import ch.qos.logback.classic.Logger;
   import ch.qos.logback.classic.LoggerContext;
   import ch.qos.logback.classic.spi.LoggingEvent;
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class TTLLLayoutTest {
  
      LoggerContext context = new LoggerContext();
      Logger logger = context.getLogger(TTLLLayoutTest.class);
      TTLLLayout layout = new TTLLLayout();
  
      @BeforeEach
      public void setUp() {
          layout.setContext(context);
          layout.start();
      }
  
      @Test
      public void nullMessage() {
          LoggingEvent event = new LoggingEvent("", logger, Level.INFO, null, null, null);
          event.setTimeStamp(0);
          String result = layout.doLayout(event);
  
          String resultSuffix = result.substring(13).trim();
  
          assertTrue(resultSuffix.matches("\\[.*\\] INFO ch.qos.logback.classic.layout.TTLLLayoutTest -- null"),
                  "[" + resultSuffix + "] did not match regex");
      }
  }