docs: protected String getDestinationChannelName() {
          if (endpointConfiguration.getChannel() != null) {
              return endpointConfiguration.getChannel().toString();
          } else if (StringUtils.hasText(endpointConfiguration.getChannelName())) {
              return endpointConfiguration.getChannelName();
          } else {
              throw new CitrusRuntimeException("Neither channel name nor channel object is set - " +
                      "please specify destination channel");
          }
      }