code: @Then("^the zNode '(.+?)' exists( and contains '(.+?)')?$")
      public void checkZnodeExists(String zNode, String foo, String document) throws Exception {
          if (document == null) {
              String breakpoint = commonspec.getZookeeperSecClient().zRead(zNode);
              assert breakpoint.equals("") : "The zNode does not exist";
          } else {
              assert commonspec.getZookeeperSecClient().zRead(zNode).contains(document) : "The zNode does not exist or the content does not match";
          }
      }
docs: Read zPath
  
  @param zNode    path at zookeeper
  @param document expected content of znode