Windows 7 with all updates applied.
C:\go\src>go version
go version devel +70af843fed44 Sat Apr 19 09:55:09 2014 +0200 windows/amd64
C:\go\src\pkg\crypto\x509>go test
--- FAIL: TestSystemVerify (0.03 seconds)
verify_test.go:382: #15: No expected chain matched BR/Moip Pagamentos S.A./MOIP,SSL Blindado
EV/api.moip.com.br -> GB/COMODO CA Limited//COMODO RSA Extended Validation Secure Server CA -> GB/C
OMODO CA Limited//COMODO RSA Certification Authority
FAIL
exit status 1
FAIL crypto/x509 1.117s
If you update your Windows system I bet this will start working. It's just a mismatch
between the trusted certs on the Windows machine and the trusted certs the test expects
on the Windows machine. Not a big deal either way.