code: public void startStep(final String uuid, final StepResult result) {
          final Optional<String> current = threadContext.getCurrent();
          if (!current.isPresent()) {
              LOGGER.error("Could not start step: no test case running");
              return;
          }
          final String parentUuid = current.get();
          startStep(parentUuid, uuid, result);
      }
docs: Start a new step as child step of current running test case or step. Shortcut
  for {@link #startStep(String, String, StepResult)}.
  
  @param uuid   the uuid of step.
  @param result the step.