Can you disable "Test" entirely?

[csharptest]

Found this works:

test:
  override:
    - echo "done"

Taken from this answer:

Test Command No-Op

I have a marketing site written with middleman and is statically deployed to S3. CircleCI detects this and runs the correct build command but since it has no tests it shows the suite as failing. Is there an custom “test” command I could use so CircleCI registers the run as successful?