You can verify that your job will be processed correctly by rendering locally with V-Ray Standalone. If these results look correct, then you should get the same results in Chaos Cloud.
Alternatively, you can submit a job and quickly pause it and/or render using lower quality or resolution settings. Remember that a paused job can always be resumed and that jobs submitted with “test” settings can be cloned and resubmitted with adjusted settings completely from your web browser.