fails:OpenSSL::X509::Certificate#not_before is nil by default
fails:OpenSSL::X509::Certificate#not_before returns the not before datetime
fails:OpenSSL::X509::Certificate#not_before= returns the argument
fails:"OpenSSL::X509::Certificate#not_before is nil by default"
fails:"OpenSSL::X509::Certificate#not_before returns the not before datetime"
fails:"OpenSSL::X509::Certificate#not_before= returns the argument"
