code: public static StartCondition logMessage(final String logMessage) {
          return new StartCondition() {
              @Override
              public StartConditionCheck build(DockerRule currentRule) {
                  log.debug("new wait for condition - message: '{}'", logMessage);
                  return new LogChecker(currentRule, logMessage);
              }
          };
      }
docs: Wait for specified text in log on container start.
  Whole log content (from container start) is checked so this condition
  will work independent of any other wait conditions.
  Rule startup will fail when message will not be found.
  
  @param logMessage Message to wait for.