'If an extension requires an issuer, the :py:data:`issuer` parameter to
:py:class:`X509Extension` provides its value.'

def test_issuer(self):

    ext2 = X509Extension(b('authorityKeyIdentifier'), False, b('issuer:always'), issuer=self.x509)
    self.x509.add_extensions([ext2])
    self.x509.sign(self.pkey, 'sha1')
    text = dump_certificate(FILETYPE_TEXT, self.x509)
    self.assertTrue((b('X509v3    Authority    Key    Identifier:') in text))
    self.assertTrue((b('DirName:/CN=Yoda    root    CA') in text))
