tests/testx509.py

   1 #!/usr/bin/env python
   2 # -*- encoding: utf-8 -*-
   3
   4 from ctypescrypto.x509 import X509,X509Store,utc,StackOfX509
   5 from ctypescrypto.oid import Oid
   6 from tempfile import NamedTemporaryFile
   7 import datetime
   8 import unittest
   9
  10
  11
  12 class TestCertInfo(unittest.TestCase):
  13     ca_cert="""-----BEGIN CERTIFICATE-----
  14 MIIEDzCCAvegAwIBAgIJAN9Ejmna3JJ7MA0GCSqGSIb3DQEBBQUAMIGdMQswCQYD
  15 VQQGEwJSVTEVMBMGA1UECAwM0JzQvtGB0LrQstCwMTAwLgYDVQQKDCfQo9C00L7R
  16 gdGC0L7QstC10YDRj9GO0YnQuNC5INGG0LXQvdGC0YAxIjAgBgNVBAMMGdCS0LjQ
  17 utGC0L7RgCDQktCw0LPQvdC10YAxITAfBgkqhkiG9w0BCQEWEnZpdHVzQHdhZ25l
  18 ci5wcC5ydTAeFw0xNDEwMjYxNDQ2MzJaFw0xNzEwMjUxNDQ2MzJaMIGdMQswCQYD
  19 VQQGEwJSVTEVMBMGA1UECAwM0JzQvtGB0LrQstCwMTAwLgYDVQQKDCfQo9C00L7R
  20 gdGC0L7QstC10YDRj9GO0YnQuNC5INGG0LXQvdGC0YAxIjAgBgNVBAMMGdCS0LjQ
  21 utGC0L7RgCDQktCw0LPQvdC10YAxITAfBgkqhkiG9w0BCQEWEnZpdHVzQHdhZ25l
  22 ci5wcC5ydTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJn+nL8CDaM0
  23 KNafGYdEDuFuCKHFxCcbaT7ecGbwjPKtnqZLOnYpa2iLFY+n7zAYw1MRkFkaR8b+
  24 +AeFPWS9T60ygeWysT9XTS77Fdl69Tmr8HChRk0BuLB3vFCy34vBHSG6Frdm8PtS
  25 PLEleldiwUCHLS+EckrnJylQK13X3HofSbIGzKK53MsuQOtp2dJw3b7MILM/+XBm
  26 RgZlEbTEPYMOH8CE3mu9/LqXfIRQM7+nmzcNZI3RAwxEVHOSHEbgFZaksTj8rMIa
  27 SrJwknmxHntI3P5PSNNbs0SO3TW8ePDIIpbVcjNsMX4qGX8b+8quZuzciKOto8S0
  28 0A6eOBd8Vi0CAwEAAaNQME4wHQYDVR0OBBYEFKzcbd6+N1TKfBjvmyTvw8+DnzAZ
  29 MB8GA1UdIwQYMBaAFKzcbd6+N1TKfBjvmyTvw8+DnzAZMAwGA1UdEwQFMAMBAf8w
  30 DQYJKoZIhvcNAQEFBQADggEBAAa1PpkpL842hh8jLXIpA/nK8aVDDcu5p3pA72/b
  31 noFnZuKcuaSUOz1rrLqxDK2JB3lmChQaVx3pZwqJgA0h0XBScar+8wM2TfeyW+oU
  32 Gr5tOAxoHVRpgn6oCoJkKo0HS2/NA12T/gYsXhXJXn4tuvDjaUzY+K+hhAWh64oL
  33 /c61eKfCZKp50t9Eoua0xHII2Mveb27Ps46j/CZ1r0ts7sGieOqjQo3GZOOikG6F
  34 vFY/2KV16/FdBovTFWMyKrzlYHm0Wgt28IWqhocq/golLfvkz3VAkLQvOF2i6hNc
  35 4feBv69SRTsTCFN9PtJCtxPX/K9LZKeccBKgGjrHQpAF+JU=
  36 -----END CERTIFICATE-----
  37 """
  38     cert1="""-----BEGIN CERTIFICATE-----
  39 MIIEDzCCAvegAwIBAgIJAN9Ejmna3JJ8MA0GCSqGSIb3DQEBBQUAMIGdMQswCQYD
  40 VQQGEwJSVTEVMBMGA1UECAwM0JzQvtGB0LrQstCwMTAwLgYDVQQKDCfQo9C00L7R
  41 gdGC0L7QstC10YDRj9GO0YnQuNC5INGG0LXQvdGC0YAxIjAgBgNVBAMMGdCS0LjQ
  42 utGC0L7RgCDQktCw0LPQvdC10YAxITAfBgkqhkiG9w0BCQEWEnZpdHVzQHdhZ25l
  43 ci5wcC5ydTAeFw0xNDEwMjYxOTA3MTdaFw0yNDEwMjMxOTA3MTdaMIGBMQswCQYD
  44 VQQGEwJSVTEVMBMGA1UECAwM0JzQvtGB0LrQstCwMRUwEwYDVQQHDAzQnNC+0YHQ
  45 utCy0LAxIDAeBgNVBAoMF9Cn0LDRgdGC0L3QvtC1INC70LjRhtC+MSIwIAYDVQQD
  46 DBnQktC40LrRgtC+0YAg0JLQsNCz0L3QtdGAMIIBIjANBgkqhkiG9w0BAQEFAAOC
  47 AQ8AMIIBCgKCAQEArQSfrrxNROyzNEz60G2EHBP+E4BL0b1QytGAZZiQp2XIhhQe
  48 b7mx+c4mpwgvD7/IdAcK+YVGx78nfY723T3wG48U7HzFNbLvNDycxyXecXbvCmRs
  49 xPy8TxkwPf6TIT3UcixtwMMqZFqlAtSTDmOOWSaUuftL/+yFk729xDoYkOZhFwUS
  50 UM5SbEZ0JpufWFjDi3Qwj3ZOTXliHC3e4C7187Me0Nne59dttyKpq1YAThn4Srar
  51 vZYU6Ykk/LUae0FCvfeiKLShWY05XnPVmvPiiFTXJP8/Au8kfezlA4b+eS81zWq2
  52 BFvNlBQsgf04S88oew0CuBBgtjUIIw7XZkS03QIDAQABo2wwajAJBgNVHRMEAjAA
  53 MB0GA1UdDgQWBBRflZBerCFYheRQne/sWL3zY7GiAzAfBgNVHSMEGDAWgBSs3G3e
  54 vjdUynwY75sk78PPg58wGTAdBgNVHREEFjAUgRJ2aXR1c0B3YWduZXIucHAucnUw
  55 DQYJKoZIhvcNAQEFBQADggEBAGx1z0ylq90hP3x/2DmfVUYBA46CiGnV4NSiaOWE
  56 Y18jCuG3W8FcI7JP4uEEjKyz3XbuhTFW2GsZ2L3FGgpA5eXBikgCn5kRpOHgb45r
  57 SxE8u3TwVlYlaF+7RHPYLqmgb25d/O/28McemMmTGecPC9edbtDqLv03aJ0t4gXn
  58 BD+xTJOP74Yhu5IPIV92J6pSBpIoy+qiyOA1iRpOWzrVHVR504vAaFxlfZs3VJhP
  59 uo291iEXyooazJdbWwZwcwk7WrNNKhqktPTg0X1ZHNnGwOAGPzwNJFGPeFj71r0t
  60 aFWU5EMRKaZK75keXq/RdaOAenl+nKF6xA2XHDhGgdndFfY=
  61 -----END CERTIFICATE-----
  62 """
  63     pubkey1="""-----BEGIN PUBLIC KEY-----
  64 MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEArQSfrrxNROyzNEz60G2E
  65 HBP+E4BL0b1QytGAZZiQp2XIhhQeb7mx+c4mpwgvD7/IdAcK+YVGx78nfY723T3w
  66 G48U7HzFNbLvNDycxyXecXbvCmRsxPy8TxkwPf6TIT3UcixtwMMqZFqlAtSTDmOO
  67 WSaUuftL/+yFk729xDoYkOZhFwUSUM5SbEZ0JpufWFjDi3Qwj3ZOTXliHC3e4C71
  68 87Me0Nne59dttyKpq1YAThn4SrarvZYU6Ykk/LUae0FCvfeiKLShWY05XnPVmvPi
  69 iFTXJP8/Au8kfezlA4b+eS81zWq2BFvNlBQsgf04S88oew0CuBBgtjUIIw7XZkS0
  70 3QIDAQAB
  71 -----END PUBLIC KEY-----
  72 """
  73     digicert_cert="""digicert.crt
  74 -----BEGIN CERTIFICATE-----
  75 MIIG5jCCBc6gAwIBAgIQAze5KDR8YKauxa2xIX84YDANBgkqhkiG9w0BAQUFADBs
  76 MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
  77 d3cuZGlnaWNlcnQuY29tMSswKQYDVQQDEyJEaWdpQ2VydCBIaWdoIEFzc3VyYW5j
  78 ZSBFViBSb290IENBMB4XDTA3MTEwOTEyMDAwMFoXDTIxMTExMDAwMDAwMFowaTEL
  79 MAkGA1UEBhMCVVMxFTATBgNVBAoTDERpZ2lDZXJ0IEluYzEZMBcGA1UECxMQd3d3
  80 LmRpZ2ljZXJ0LmNvbTEoMCYGA1UEAxMfRGlnaUNlcnQgSGlnaCBBc3N1cmFuY2Ug
  81 RVYgQ0EtMTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAPOWYth1bhn/
  82 PzR8SU8xfg0ETpmB4rOFVZEwscCvcLssqOcYqj9495BoUoYBiJfiOwZlkKq9ZXbC
  83 7L4QWzd4g2B1Rca9dKq2n6Q6AVAXxDlpufFP74LByvNK28yeUE9NQKM6kOeGZrzw
  84 PnYoTNF1gJ5qNRQ1A57bDIzCKK1Qss72kaPDpQpYSfZ1RGy6+c7pqzoC4E3zrOJ6
  85 4GAiBTyC01Li85xH+DvYskuTVkq/cKs+6WjIHY9YHSpNXic9rQpZL1oRIEDZaARo
  86 LfTAhAsKG3jf7RpY3PtBWm1r8u0c7lwytlzs16YDMqbo3rcoJ1mIgP97rYlY1R4U
  87 pPKwcNSgPqcCAwEAAaOCA4UwggOBMA4GA1UdDwEB/wQEAwIBhjA7BgNVHSUENDAy
  88 BggrBgEFBQcDAQYIKwYBBQUHAwIGCCsGAQUFBwMDBggrBgEFBQcDBAYIKwYBBQUH
  89 AwgwggHEBgNVHSAEggG7MIIBtzCCAbMGCWCGSAGG/WwCATCCAaQwOgYIKwYBBQUH
  90 AgEWLmh0dHA6Ly93d3cuZGlnaWNlcnQuY29tL3NzbC1jcHMtcmVwb3NpdG9yeS5o
  91 dG0wggFkBggrBgEFBQcCAjCCAVYeggFSAEEAbgB5ACAAdQBzAGUAIABvAGYAIAB0
  92 AGgAaQBzACAAQwBlAHIAdABpAGYAaQBjAGEAdABlACAAYwBvAG4AcwB0AGkAdAB1
  93 AHQAZQBzACAAYQBjAGMAZQBwAHQAYQBuAGMAZQAgAG8AZgAgAHQAaABlACAARABp
  94 AGcAaQBDAGUAcgB0ACAARQBWACAAQwBQAFMAIABhAG4AZAAgAHQAaABlACAAUgBl
  95 AGwAeQBpAG4AZwAgAFAAYQByAHQAeQAgAEEAZwByAGUAZQBtAGUAbgB0ACAAdwBo
  96 AGkAYwBoACAAbABpAG0AaQB0ACAAbABpAGEAYgBpAGwAaQB0AHkAIABhAG4AZAAg
  97 AGEAcgBlACAAaQBuAGMAbwByAHAAbwByAGEAdABlAGQAIABoAGUAcgBlAGkAbgAg
  98 AGIAeQAgAHIAZQBmAGUAcgBlAG4AYwBlAC4wEgYDVR0TAQH/BAgwBgEB/wIBADCB
  99 gwYIKwYBBQUHAQEEdzB1MCQGCCsGAQUFBzABhhhodHRwOi8vb2NzcC5kaWdpY2Vy
 100 dC5jb20wTQYIKwYBBQUHMAKGQWh0dHA6Ly93d3cuZGlnaWNlcnQuY29tL0NBQ2Vy
 101 dHMvRGlnaUNlcnRIaWdoQXNzdXJhbmNlRVZSb290Q0EuY3J0MIGPBgNVHR8EgYcw
 102 gYQwQKA+oDyGOmh0dHA6Ly9jcmwzLmRpZ2ljZXJ0LmNvbS9EaWdpQ2VydEhpZ2hB
 103 c3N1cmFuY2VFVlJvb3RDQS5jcmwwQKA+oDyGOmh0dHA6Ly9jcmw0LmRpZ2ljZXJ0
 104 LmNvbS9EaWdpQ2VydEhpZ2hBc3N1cmFuY2VFVlJvb3RDQS5jcmwwHQYDVR0OBBYE
 105 FExYyyXwQU9S9CjIgUObpqig5pLlMB8GA1UdIwQYMBaAFLE+w2kD+L9HAdSYJhoI
 106 Au9jZCvDMA0GCSqGSIb3DQEBBQUAA4IBAQBMeheHKF0XvLIyc7/NLvVYMR3wsXFU
 107 nNabZ5PbLwM+Fm8eA8lThKNWYB54lBuiqG+jpItSkdfdXJW777UWSemlQk808kf/
 108 roF/E1S3IMRwFcuBCoHLdFfcnN8kpCkMGPAc5K4HM+zxST5Vz25PDVR708noFUjU
 109 xbvcNRx3RQdIRYW9135TuMAW2ZXNi419yWBP0aKb49Aw1rRzNubS+QOy46T15bg+
 110 BEkAui6mSnKDcp33C4ypieez12Qf1uNgywPE3IjpnSUBAHHLA7QpYCWP+UbRe3Gu
 111 zVMSW4SOwg/H7ZMZ2cn6j1g0djIvruFQFGHUqFijyDATI+/GJYw2jxyA
 112 -----END CERTIFICATE-----
 113 """
 114     def test_readpubkey(self):
 115         c=X509(self.cert1)
 116         p=c.pubkey
 117         self.assertEqual(p.exportpub(),self.pubkey1)
 118     def test_pem(self):
 119         c=X509(self.cert1)
 120         self.assertEqual(c.pem(),self.cert1)
 121     def test_subject(self):
 122         c=X509(self.cert1)
 123         self.assertEqual(unicode(c.subject),u'C=RU,ST=Москва,L=Москва,O=Частное лицо,CN=Виктор Вагнер')
 124     def test_subject_str(self):
 125         c=X509(self.cert1)
 126         self.assertEqual(str(c.subject),b'C=RU,ST=\\D0\\9C\\D0\\BE\\D1\\81\\D0\\BA\\D0\\B2\\D0\\B0,L=\\D0\\9C\\D0\\BE\\D1\\81\\D0\\BA\\D0\\B2\\D0\\B0,O=\\D0\\A7\\D0\\B0\\D1\\81\\D1\\82\\D0\\BD\\D0\\BE\\D0\\B5 \\D0\\BB\\D0\\B8\\D1\\86\\D0\\BE,CN=\\D0\\92\\D0\\B8\\D0\\BA\\D1\\82\\D0\\BE\\D1\\80 \\D0\\92\\D0\\B0\\D0\\B3\\D0\\BD\\D0\\B5\\D1\\80')
 127     def test_subject_len(self):
 128         c=X509(self.cert1)
 129         self.assertEqual(len(c.subject),5)
 130     def test_issuer(self):
 131         c=X509(self.cert1)
 132         self.assertEqual(unicode(c.issuer),u'C=RU,ST=Москва,O=Удостоверяющий центр,CN=Виктор Вагнер,emailAddress=vitus@wagner.pp.ru')
 133     def test_subjectfields(self):
 134         c=X509(self.cert1)
 135         self.assertEqual(c.subject[Oid("C")],"RU")
 136         with self.assertRaises(TypeError):
 137             x=c.subject["CN"]
 138         self.assertEqual(c.subject[Oid("L")],u'\u041c\u043e\u0441\u043a\u0432\u0430')
 139     def test_subjectmodify(self):
 140         c=X509(self.cert1)
 141         with self.assertRaises(ValueError):
 142             c.subject[Oid("CN")]=u'Foo'
 143         with self.assertRaises(ValueError):
 144             del c.subject[Oid('CN')]
 145     def test_subjectbadsubfield(self):
 146         c=X509(self.cert1)
 147         with self.assertRaises(KeyError):
 148             x=c.subject[Oid("streetAddress")]
 149     def test_subjectfieldindex(self):
 150         c=X509(self.cert1)
 151         self.assertEqual(repr(c.subject[0]),repr((Oid('C'),u'RU')))
 152     def test_subjectbadindex(self):
 153         c=X509(self.cert1)
 154         with self.assertRaises(IndexError):
 155             x=c.subject[11]
 156         with self.assertRaises(IndexError):
 157             x=c.subject[-1]
 158     def test_notBefore(self):
 159         c=X509(self.cert1)
 160         self.assertEqual(c.startDate,datetime.datetime(2014,10,26,19,07,17,0,utc))
 161     def test_notAfter(self):
 162         c=X509(self.cert1)
 163         self.assertEqual(c.endDate,datetime.datetime(2024,10,23,19,7,17,0,utc))
 164     def test_subjectHash(self):
 165         c=X509(self.cert1)
 166         self.assertEqual(hash(c.subject),0x1f3ed722)
 167     def test_issuerHash(self):
 168         c=X509(self.cert1)
 169         self.assertEqual(hash(c.issuer),0x7d3ea8c3)
 170     def test_namecomp(self):
 171         c=X509(self.cert1)
 172         ca=X509(self.ca_cert)
 173         self.assertEqual(c.issuer,ca.subject)
 174         self.assertNotEqual(c.subject,c.issuer)
 175         self.assertEqual(ca.issuer,ca.subject)
 176     def test_serial(self):
 177         c=X509(self.cert1)
 178         self.assertEqual(c.serial,0xDF448E69DADC927CL)
 179     def test_version(self):
 180         c=X509(self.cert1)
 181         self.assertEqual(c.version,3)
 182     def test_ca_cert(self):
 183         ca=X509(self.ca_cert)
 184         self.assertTrue(ca.check_ca())
 185         notca=X509(self.cert1)
 186         self.assertFalse(notca.check_ca())
 187     def test_extension_count(self):
 188         cert=X509(self.cert1)
 189         self.assertTrue(len(cert.extensions),4)
 190         ca_cert=X509(self.ca_cert)
 191         self.assertEqual(len(ca_cert.extensions),3)
 192     def test_extension_outofrange(self):
 193         cert=X509(self.cert1)
 194         with self.assertRaises(IndexError):
 195             cert.extensions[4]
 196         with self.assertRaises(IndexError):
 197             cert.extensions[-1]
 198     def test_extension_oid(self):
 199         cert=X509(self.cert1)
 200         ext=cert.extensions[0]
 201         ext_id=ext.oid
 202         self.assertTrue(isinstance(ext_id,Oid))
 203         self.assertEqual(ext_id,Oid('basicConstraints'))
 204     def test_extension_text(self):
 205         cert=X509(self.cert1)
 206         ext=cert.extensions[0]
 207         self.assertEqual(str(ext),'CA:FALSE')
 208         self.assertEqual(unicode(ext),u'CA:FALSE')
 209     def test_extenson_find(self):
 210         cert=X509(self.cert1)
 211         exts=cert.extensions.find(Oid('subjectAltName'))
 212         self.assertEqual(len(exts),1)
 213         self.assertEqual(exts[0].oid,Oid('subjectAltName'))
 214     def test_extension_bad_find(self):
 215         cert=X509(self.cert1)
 216         with self.assertRaises(TypeError):
 217             exts=cert.extensions.find('subjectAltName')
 218     def test_extenson_critical(self):
 219         cert=X509(self.digicert_cert)
 220         crit_exts=cert.extensions.find_critical()
 221         self.assertEqual(len(crit_exts),2)
 222         other_exts=cert.extensions.find_critical(False)
 223         self.assertEqual(len(crit_exts)+len(other_exts),len(cert.extensions))
 224         self.assertEqual(crit_exts[0].critical,True)
 225         self.assertEqual(other_exts[0].critical,False)
 226     def test_verify_by_key(self):
 227         ca=X509(self.ca_cert)
 228         pubkey=ca.pubkey
 229         self.assertTrue(ca.verify(key=pubkey))
 230         c=X509(self.cert1)
 231         pk2=c.pubkey
 232         self.assertFalse(c.verify(key=pk2))
 233         self.assertTrue(c.verify(key=pubkey))
 234     def test_verify_self_singed(self):
 235         ca=X509(self.ca_cert)
 236         self.assertTrue(ca.verify())
 237     def test_default_filestore(self):
 238         store=X509Store(default=True)
 239         c1=X509(self.cert1)
 240         # Cert signed by our CA shouldn't be successfully verified
 241         # by default CA store
 242         self.assertFalse(c1.verify(store))
 243         # but cert, downloaded from some commercial CA - should.
 244         c2=X509(self.digicert_cert)
 245         self.assertTrue(c2.verify(store))
 246     def test_verify_by_filestore(self):
 247         trusted=NamedTemporaryFile()
 248         trusted.write(self.ca_cert)
 249         trusted.flush()
 250         goodcert=X509(self.cert1)
 251         badcert=X509(self.cert1[0:-30]+"GG"+self.cert1[-28:])
 252         gitcert=X509(self.digicert_cert)
 253         store=X509Store(file=trusted.name)
 254         # We should successfuly verify certificate signed by our CA cert
 255         self.assertTrue(goodcert.verify(store))
 256         # We should reject corrupted certificate
 257         self.assertFalse(badcert.verify(store))
 258         # And if we specify explicitely certificate file, certificate,
 259         # signed by some commercial CA should be rejected too
 260         self.assertFalse(gitcert.verify(store))
 261         trusted.close()
 262     def test_verify_by_dirstore(self):
 263         pass
 264     def test_certstack1(self):
 265         l=[]
 266         l.append(X509(self.cert1))
 267         self.assertEqual(unicode(l[0].subject[Oid('CN')]),u'Виктор Вагнер')
 268         l.append(X509(self.ca_cert))
 269         l.append(X509(self.digicert_cert))
 270         stack=StackOfX509(certs=l)
 271         self.assertEqual(len(stack),3)
 272         self.assertTrue(isinstance(stack[1],X509))
 273         self.assertEqual(unicode(stack[0].subject[Oid('CN')]),u'Виктор Вагнер')
 274         with self.assertRaises(IndexError):
 275             c=stack[-1]
 276         with self.assertRaises(IndexError):
 277             c=stack[3]
 278         del stack[1]
 279         self.assertEqual(len(stack),2)
 280         self.assertEqual(unicode(stack[0].subject[Oid('CN')]),u'Виктор Вагнер')
 281         self.assertEqual(unicode(stack[1].subject[Oid('CN')]),u'DigiCert High Assurance EV CA-1')
 282     def test_certstack2(self):
 283         stack=StackOfX509()
 284         stack.append(X509(self.cert1))
 285         stack.append(X509(self.ca_cert))
 286         c=stack[1]
 287         stack[1]=X509(self.digicert_cert)
 288         self.assertEqual(len(stack),2)
 289         self.assertEqual(unicode(stack[1].subject[Oid('CN')]),u'DigiCert High Assurance EV CA-1')
 290         with self.assertRaises(IndexError):
 291             stack[-1]=c
 292         with self.assertRaises(IndexError):
 293             stack[3]=c
 294         with self.assertRaises(TypeError):
 295             stack[0]=self.cert1
 296         with self.assertRaises(TypeError):
 297             stack.append(self.cert1)
 298     def test_certstack3(self):
 299         l=[]
 300         l.append(X509(self.cert1))
 301         self.assertEqual(unicode(l[0].subject[Oid('CN')]),u'Виктор Вагнер')
 302         l.append(X509(self.ca_cert))
 303         l.append(X509(self.digicert_cert))
 304         stack=StackOfX509(certs=l)
 305         stack2=StackOfX509(ptr=stack.ptr,disposable=False)
 306         with self.assertRaises(ValueError):
 307             stack3=StackOfX509(ptr=stack.ptr,certs=l)
 308         with self.assertRaises(ValueError):
 309             stack2[1]=l[0]
 310         with self.assertRaises(ValueError):
 311             stack2.append(l[0])
 312 if __name__ == '__main__':
 313     unittest.main()