You can use the --test-cert or --dry-run flags for this purpose. The former just makes the client use the staging server (which has higher rate limits), while t

You can use the --test-cert or --dry-run flags for this purpose. The former just makes the client use the staging server (which has higher rate limits), while the latter uses the staging server to simulate renewal, stopping short of actually storing the staging certificates (in other words: ideal for testing renewal in production).