Yes.
To use a different test server you could do:
certbot renew --dry-run --server URL
Where the URL value is the test server. The --server value must appear after the --dry-run.
The default for --dry-run is:
--server https://acme-staging-v02.api.letsencrypt.org/directory
But, ZeroSSL does not have their own test system (google does I think and there may be others)