diff --git a/tests/test_ogone.py b/tests/test_ogone.py
index abf472a..0aefe25 100644
--- a/tests/test_ogone.py
+++ b/tests/test_ogone.py
@@ -18,6 +18,7 @@
 from unittest import TestCase
 from xml.etree import ElementTree as ET
 
+import six
 from six.moves.urllib import parse as urllib
 
 import eopayment
@@ -36,6 +37,10 @@ BACKEND_PARAMS = {
 
 
 class OgoneTests(TestCase):
+    if six.PY2:
+        def assertRaisesRegex(self, *args, **kwargs):
+            return self.assertRaisesRegexp(*args, **kwargs)
+
     def test_request(self):
         ogone_backend = eopayment.Payment('ogone', BACKEND_PARAMS)
         amount = '42.42'
@@ -100,7 +105,7 @@ class OgoneTests(TestCase):
     def test_bad_response(self):
         ogone_backend = eopayment.Payment('ogone', BACKEND_PARAMS)
         data = {'payid': '32100123', 'status': 9, 'ncerror': 0}
-        with self.assertRaisesRegexp(ResponseError, 'missing ORDERID, PAYID, STATUS or NCERROR'):
+        with self.assertRaisesRegex(ResponseError, 'missing ORDERID, PAYID, STATUS or NCERROR'):
             ogone_backend.response(urllib.urlencode(data))
 
     def test_bank_transfer_response(self):
diff --git a/tests/test_paybox.py b/tests/test_paybox.py
index 2571f04..dd11160 100644
--- a/tests/test_paybox.py
+++ b/tests/test_paybox.py
@@ -21,12 +21,14 @@ from unittest import TestCase
 from decimal import Decimal
 import base64
 import mock
+import six
 from six.moves.urllib import parse as urllib
 from xml.etree import ElementTree as ET
 
 import eopayment.paybox as paybox
 import eopayment
 
+
 BACKEND_PARAMS = {
     'platform': u'test',
     'site': u'12345678',
@@ -43,6 +45,10 @@ BACKEND_PARAMS = {
 
 
 class PayboxTests(TestCase):
+    if six.PY2:
+        def assertRaisesRegex(self, *args, **kwargs):
+            return self.assertRaisesRegexp(*args, **kwargs)
+
     def test_sign(self):
         key = (b'0123456789ABCDEF0123456789ABCDEF0123456789'
                b'ABCDEF0123456789ABCDEF0123456789ABCDEF0123'
@@ -210,7 +216,7 @@ class PayboxTests(TestCase):
         assert not response.signed
         assert response.transaction_date.isoformat() == '2020-01-01T01:01:01+01:00'
 
-        with self.assertRaisesRegexp(eopayment.ResponseError, 'missing erreur or reference'):
+        with self.assertRaisesRegex(eopayment.ResponseError, 'missing erreur or reference'):
             backend.response('foo=bar')
 
     def test_perform_operations(self):
@@ -278,7 +284,7 @@ class PayboxTests(TestCase):
                     error_response = u"""CODEREPONSE=00015&COMMENTAIRE=PAYBOX : Transaction non trouvée"""
                     response = mock.Mock(status_code=200, text=error_response)
                     requests_post.return_value = response
-                    self.assertRaisesRegexp(
+                    self.assertRaisesRegex(
                         eopayment.ResponseError,
                         'Transaction non trouvée',
                         getattr(backend, operation_name),
diff --git a/tests/test_spplus.py b/tests/test_spplus.py
index 970a5db..968c842 100644
--- a/tests/test_spplus.py
+++ b/tests/test_spplus.py
@@ -14,29 +14,30 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from unittest import TestCase
 import eopayment.spplus as spplus
 from eopayment import ResponseError
 
+import pytest
 
-class SPPlustTest(TestCase):
-    ntkey = b'58 6d fc 9c 34 91 9b 86 3f ' \
-        b'fd 64 63 c9 13 4a 26 ba 29 74 1e c7 e9 80 79'
 
-    tests = [
-        ('x=coin',
-         'c04f8266d6ae3ce37551cce996c751be4a95d10a'),
-        ('x=coin&y=toto',
-         'ef008e02f8dbf5e70e83da416b0b3a345db203de'),
-        ('x=wdwd%20%3Fdfgfdgd&z=343&hmac=04233b78bb5aff332d920d4e89394f505ec58a2a',
-         '04233b78bb5aff332d920d4e89394f505ec58a2a')
-    ]
+ntkey = b'58 6d fc 9c 34 91 9b 86 3f ' \
+    b'fd 64 63 c9 13 4a 26 ba 29 74 1e c7 e9 80 79'
 
-    def test_spplus(self):
-        payment = spplus.Payment({'cle': self.ntkey, 'siret': '00000000000001-01'})
+tests = [
+    ('x=coin',
+     'c04f8266d6ae3ce37551cce996c751be4a95d10a'),
+    ('x=coin&y=toto',
+     'ef008e02f8dbf5e70e83da416b0b3a345db203de'),
+    ('x=wdwd%20%3Fdfgfdgd&z=343&hmac=04233b78bb5aff332d920d4e89394f505ec58a2a',
+     '04233b78bb5aff332d920d4e89394f505ec58a2a')
+]
 
-        for query, result in self.tests:
-            self.assertEqual(spplus.sign_ntkey_query(self.ntkey, query).lower(), result)
 
-        with self.assertRaisesRegexp(ResponseError, 'missing reference, etat or refsfp'):
-            payment.response('foo=bar')
+def test_spplus():
+    payment = spplus.Payment({'cle': ntkey, 'siret': '00000000000001-01'})
+
+    for query, result in tests:
+        assert spplus.sign_ntkey_query(ntkey, query).lower() == result
+
+    with pytest.raises(ResponseError, match=r'missing reference, etat or refsfp'):
+        payment.response('foo=bar')