CSR Validation

Our organization is interested in buying a 128-bit SSL Certificate to install on a Web Server located in a LAB. The only purpose of this certificate will be to test our Web application using HTTPS (128-bit). Since it will be used only by our Lab experts, we only care about the key that helps providing the encryption and not by the authenticity the certificate garantees. In other words, is there any way to validate our CSR so we can install it and test our application without buying a full Server Certificate -used normaly for public web site- ? Thawte.com has a free trial of 21 days but this can’t be an option since we will need it for a while.

Thanks very much
Patrick.