AES-GCM conformance test Is there any conformance tests/sequences to validate AES-GCM &amp; GHASH() implementation?

Details: I'm implementing AES-GSM, that's just for better understanding of that stuff, nothing more. Well I need to validate somehow my result. There is 'openssl' and some python libraries to do encryption but they allow to check only final encryption result and nothing else in between. I haven't seen anything at all to validate 'GHASH()' or 'multH()'.

Thanks.
gcm-spec, this document has "AES Test Vectors" section in the end. There are a numerous test cases with all intermediate results for encryption and ghash. I found them a rather useful.