Clean up new_credential_ref usage and surrounding code

Standardize use of unit.new_credential_ref(). Remove methods in preference
for the common function.

Refactor the credential creation code to simplify and standardize the tests.

Change-Id: I4274ea9ae17ae7b8b18dc0c86c9f9496a0803c71

keystone/tests/unit/core.py

@@ -16,6 +16,7 @@ from __future__ import absolute_import
 import atexit
 import datetime
 import functools
+import hashlib
 import json
 import logging
 import os
@@ -350,22 +351,54 @@ def new_group_ref(domain_id, **kwargs):
     return ref
 
 
-def new_credential_ref(user_id, project_id=None, cred_type=None):
+def new_credential_ref(user_id, project_id=None, type='cert', **kwargs):
     ref = {
         'id': uuid.uuid4().hex,
         'user_id': user_id,
+        'type': type,
     }
-    if cred_type == 'ec2':
-        ref['type'] = 'ec2'
-        ref['blob'] = uuid.uuid4().hex
-    else:
-        ref['type'] = 'cert'
-        ref['blob'] = uuid.uuid4().hex
+
     if project_id:
         ref['project_id'] = project_id
+    if 'blob' not in kwargs:
+        ref['blob'] = uuid.uuid4().hex
+
+    ref.update(kwargs)
     return ref
 
 
+def new_cert_credential(user_id, project_id=None, blob=None, **kwargs):
+    if blob is None:
+        blob = {'access': uuid.uuid4().hex, 'secret': uuid.uuid4().hex}
+
+    credential = new_credential_ref(user_id=user_id,
+                                    project_id=project_id,
+                                    blob=json.dumps(blob),
+                                    type='cert',
+                                    **kwargs)
+    return blob, credential
+
+
+def new_ec2_credential(user_id, project_id=None, blob=None, **kwargs):
+    if blob is None:
+        blob = {
+            'access': uuid.uuid4().hex,
+            'secret': uuid.uuid4().hex,
+            'trust_id': None
+        }
+
+    if 'id' not in kwargs:
+        access = blob['access'].encode('utf-8')
+        kwargs['id'] = hashlib.sha256(access).hexdigest()
+
+    credential = new_credential_ref(user_id=user_id,
+                                    project_id=project_id,
+                                    blob=json.dumps(blob),
+                                    type='ec2',
+                                    **kwargs)
+    return blob, credential
+
+
 def new_role_ref(**kwargs):
     ref = {
         'id': uuid.uuid4().hex,

keystone/tests/unit/test_backend_sql.py

@@ -745,17 +745,10 @@ class SqlModuleInitialization(unit.TestCase):
 class SqlCredential(SqlTests):
 
     def _create_credential_with_user_id(self, user_id=uuid.uuid4().hex):
-        credential_id = uuid.uuid4().hex
-        new_credential = {
-            'id': credential_id,
-            'user_id': user_id,
-            'project_id': uuid.uuid4().hex,
-            'blob': uuid.uuid4().hex,
-            'type': uuid.uuid4().hex,
-            'extra': uuid.uuid4().hex
-        }
-        self.credential_api.create_credential(credential_id, new_credential)
-        return new_credential
+        credential = unit.new_credential_ref(user_id=user_id,
+                                             extra=uuid.uuid4().hex)
+        self.credential_api.create_credential(credential['id'], credential)
+        return credential
 
     def _validateCredentialList(self, retrieved_credentials,
                                 expected_credentials):

keystone/tests/unit/test_contrib_ec2.py

@@ -34,14 +34,13 @@ class TestCredentialEc2(unit.TestCase):
         self.load_fixtures(default_fixtures)
         self.user_id = self.user_foo['id']
         self.project_id = self.tenant_bar['id']
-        self.blob = {'access': uuid.uuid4().hex,
-                     'secret': uuid.uuid4().hex}
         self.controller = controllers.Ec2Controller()
-        self.creds_ref = {'user_id': self.user_id,
-                          'tenant_id': self.project_id,
-                          'access': self.blob['access'],
-                          'secret': self.blob['secret'],
-                          'trust_id': None}
+        self.blob, tmp_ref = unit.new_ec2_credential(
+            user_id=self.user_id,
+            project_id=self.project_id)
+
+        self.creds_ref = (controllers.Ec2Controller
+                          ._convert_v3_to_ec2_credential(tmp_ref))
 
     def test_signature_validate_no_host_port(self):
         """Test signature validation with the access/secret provided."""
@@ -149,17 +148,10 @@ class TestCredentialEc2(unit.TestCase):
                    'path': '/bar',
                    'params': params}
 
-        creds_ref = {'user_id': self.user_id,
-                     'tenant_id': self.project_id,
-                     'access': self.blob['access'],
-                     'secret': self.blob['secret'],
-                     'trust_id': None
-                     }
-
         # Now validate the signature based on the dummy request
         self.assertRaises(exception.Unauthorized,
                           self.controller.check_signature,
-                          creds_ref, sig_ref)
+                          self.creds_ref, sig_ref)
 
     def test_signature_validate_invalid_signature(self):
         """Signature is not signed on the correct data."""
@@ -182,17 +174,10 @@ class TestCredentialEc2(unit.TestCase):
                    'path': '/bar',
                    'params': params}
 
-        creds_ref = {'user_id': self.user_id,
-                     'tenant_id': self.project_id,
-                     'access': self.blob['access'],
-                     'secret': self.blob['secret'],
-                     'trust_id': None
-                     }
-
         # Now validate the signature based on the dummy request
         self.assertRaises(exception.Unauthorized,
                           self.controller.check_signature,
-                          creds_ref, sig_ref)
+                          self.creds_ref, sig_ref)
 
     def test_check_non_admin_user(self):
         """Checking if user is admin causes uncaught error.

keystone/tests/unit/test_v3.py

@@ -246,10 +246,6 @@ class RestfulTestCase(unit.SQLDriverOverrides, rest.RestfulTestCase,
         # The server adds 'enabled' and defaults to True.
         self.endpoint['enabled'] = True
 
-    def new_credential_ref(self, user_id, project_id=None, cred_type=None):
-        return unit.new_credential_ref(user_id, project_id=project_id,
-                                       cred_type=cred_type)
-
     def create_new_default_project_for_user(self, user_id, domain_id,
                                             enable_project=True):
         ref = unit.new_project_ref(domain_id=domain_id, enabled=enable_project)

keystone/tests/unit/test_v3_credential.py

@@ -31,25 +31,19 @@ CONF = cfg.CONF
 
 class CredentialBaseTestCase(test_v3.RestfulTestCase):
     def _create_dict_blob_credential(self):
-        blob = {"access": uuid.uuid4().hex,
-                "secret": uuid.uuid4().hex}
-        credential_id = hashlib.sha256(blob['access']).hexdigest()
-        credential = self.new_credential_ref(
-            user_id=self.user['id'],
-            project_id=self.project_id)
-        credential['id'] = credential_id
+        blob, credential = unit.new_ec2_credential(user_id=self.user['id'],
+                                                   project_id=self.project_id)
 
         # Store the blob as a dict *not* JSON ref bug #1259584
         # This means we can test the dict->json workaround, added
         # as part of the bugfix for backwards compatibility works.
         credential['blob'] = blob
-        credential['type'] = 'ec2'
+        credential_id = credential['id']
+
         # Create direct via the DB API to avoid validation failure
-        self.credential_api.create_credential(
-            credential_id,
-            credential)
-        expected_blob = json.dumps(blob)
-        return expected_blob, credential_id
+        self.credential_api.create_credential(credential_id, credential)
+
+        return json.dumps(blob), credential_id
 
 
 class CredentialTestCase(CredentialBaseTestCase):
@@ -59,13 +53,11 @@ class CredentialTestCase(CredentialBaseTestCase):
 
         super(CredentialTestCase, self).setUp()
 
-        self.credential_id = uuid.uuid4().hex
-        self.credential = self.new_credential_ref(
-            user_id=self.user['id'],
-            project_id=self.project_id)
-        self.credential['id'] = self.credential_id
+        self.credential = unit.new_credential_ref(user_id=self.user['id'],
+                                                  project_id=self.project_id)
+
         self.credential_api.create_credential(
-            self.credential_id,
+            self.credential['id'],
             self.credential)
 
     def test_credential_api_delete_credentials_for_project(self):
@@ -74,7 +66,7 @@ class CredentialTestCase(CredentialBaseTestCase):
         # once we delete all credentials for self.project_id
         self.assertRaises(exception.CredentialNotFound,
                           self.credential_api.get_credential,
-                          credential_id=self.credential_id)
+                          credential_id=self.credential['id'])
 
     def test_credential_api_delete_credentials_for_user(self):
         self.credential_api.delete_credentials_for_user(self.user_id)
@@ -82,7 +74,7 @@ class CredentialTestCase(CredentialBaseTestCase):
         # once we delete all credentials for self.user_id
         self.assertRaises(exception.CredentialNotFound,
                           self.credential_api.get_credential,
-                          credential_id=self.credential_id)
+                          credential_id=self.credential['id'])
 
     def test_list_credentials(self):
         """Call ``GET /credentials``."""
@@ -91,10 +83,8 @@ class CredentialTestCase(CredentialBaseTestCase):
 
     def test_list_credentials_filtered_by_user_id(self):
         """Call ``GET  /credentials?user_id={user_id}``."""
-        credential = self.new_credential_ref(
-            user_id=uuid.uuid4().hex)
-        self.credential_api.create_credential(
-            credential['id'], credential)
+        credential = unit.new_credential_ref(user_id=uuid.uuid4().hex)
+        self.credential_api.create_credential(credential['id'], credential)
 
         r = self.get('/credentials?user_id=%s' % self.user['id'])
         self.assertValidCredentialListResponse(r, ref=self.credential)
@@ -105,9 +95,9 @@ class CredentialTestCase(CredentialBaseTestCase):
         """Call ``GET  /credentials?type={type}``."""
         # The type ec2 was chosen, instead of a random string,
         # because the type must be in the list of supported types
-        ec2_credential = self.new_credential_ref(user_id=uuid.uuid4().hex,
+        ec2_credential = unit.new_credential_ref(user_id=uuid.uuid4().hex,
                                                  project_id=self.project_id,
-                                                 cred_type='ec2')
+                                                 type='ec2')
 
         ec2_resp = self.credential_api.create_credential(
             ec2_credential['id'], ec2_credential)
@@ -134,12 +124,10 @@ class CredentialTestCase(CredentialBaseTestCase):
         user2_id = uuid.uuid4().hex
 
         # Creating credentials for two different users
-        credential_user1_ec2 = self.new_credential_ref(
-            user_id=user1_id, cred_type='ec2')
-        credential_user1_cert = self.new_credential_ref(
-            user_id=user1_id)
-        credential_user2_cert = self.new_credential_ref(
-            user_id=user2_id)
+        credential_user1_ec2 = unit.new_credential_ref(user_id=user1_id,
+                                                       type='ec2')
+        credential_user1_cert = unit.new_credential_ref(user_id=user1_id)
+        credential_user2_cert = unit.new_credential_ref(user_id=user2_id)
 
         self.credential_api.create_credential(
             credential_user1_ec2['id'], credential_user1_ec2)
@@ -157,7 +145,7 @@ class CredentialTestCase(CredentialBaseTestCase):
 
     def test_create_credential(self):
         """Call ``POST /credentials``."""
-        ref = self.new_credential_ref(user_id=self.user['id'])
+        ref = unit.new_credential_ref(user_id=self.user['id'])
         r = self.post(
             '/credentials',
             body={'credential': ref})
@@ -167,18 +155,17 @@ class CredentialTestCase(CredentialBaseTestCase):
         """Call ``GET /credentials/{credential_id}``."""
         r = self.get(
             '/credentials/%(credential_id)s' % {
-                'credential_id': self.credential_id})
+                'credential_id': self.credential['id']})
         self.assertValidCredentialResponse(r, self.credential)
 
     def test_update_credential(self):
         """Call ``PATCH /credentials/{credential_id}``."""
-        ref = self.new_credential_ref(
-            user_id=self.user['id'],
-            project_id=self.project_id)
+        ref = unit.new_credential_ref(user_id=self.user['id'],
+                                      project_id=self.project_id)
         del ref['id']
         r = self.patch(
             '/credentials/%(credential_id)s' % {
-                'credential_id': self.credential_id},
+                'credential_id': self.credential['id']},
             body={'credential': ref})
         self.assertValidCredentialResponse(r, ref)
 
@@ -186,23 +173,18 @@ class CredentialTestCase(CredentialBaseTestCase):
         """Call ``DELETE /credentials/{credential_id}``."""
         self.delete(
             '/credentials/%(credential_id)s' % {
-                'credential_id': self.credential_id})
+                'credential_id': self.credential['id']})
 
     def test_create_ec2_credential(self):
         """Call ``POST /credentials`` for creating ec2 credential."""
-        ref = self.new_credential_ref(user_id=self.user['id'],
-                                      project_id=self.project_id)
-        blob = {"access": uuid.uuid4().hex,
-                "secret": uuid.uuid4().hex}
-        ref['blob'] = json.dumps(blob)
-        ref['type'] = 'ec2'
-        r = self.post(
-            '/credentials',
-            body={'credential': ref})
+        blob, ref = unit.new_ec2_credential(user_id=self.user['id'],
+                                            project_id=self.project_id)
+        r = self.post('/credentials', body={'credential': ref})
         self.assertValidCredentialResponse(r, ref)
         # Assert credential id is same as hash of access key id for
         # ec2 credentials
-        self.assertEqual(hashlib.sha256(blob['access']).hexdigest(),
+        access = blob['access'].encode('utf-8')
+        self.assertEqual(hashlib.sha256(access).hexdigest(),
                          r.result['credential']['id'])
         # Create second ec2 credential with the same access key id and check
         # for conflict.
@@ -217,7 +199,11 @@ class CredentialTestCase(CredentialBaseTestCase):
         r = self.get(
             '/credentials/%(credential_id)s' % {
                 'credential_id': credential_id})
-        self.assertEqual(expected_blob, r.result['credential']['blob'])
+
+        # use json.loads to transform the blobs back into Python dictionaries
+        # to avoid problems with the keys being in different orders.
+        self.assertEqual(json.loads(expected_blob),
+                         json.loads(r.result['credential']['blob']))
 
     def test_list_ec2_dict_blob(self):
         """Ensure non-JSON blob data is correctly converted."""
@@ -227,34 +213,31 @@ class CredentialTestCase(CredentialBaseTestCase):
         list_creds = list_r.result['credentials']
         list_ids = [r['id'] for r in list_creds]
         self.assertIn(credential_id, list_ids)
+        # use json.loads to transform the blobs back into Python dictionaries
+        # to avoid problems with the keys being in different orders.
         for r in list_creds:
             if r['id'] == credential_id:
-                self.assertEqual(expected_blob, r['blob'])
+                self.assertEqual(json.loads(expected_blob),
+                                 json.loads(r['blob']))
 
     def test_create_non_ec2_credential(self):
         """Call ``POST /credentials`` for creating non-ec2 credential."""
-        ref = self.new_credential_ref(user_id=self.user['id'])
-        blob = {"access": uuid.uuid4().hex,
-                "secret": uuid.uuid4().hex}
-        ref['blob'] = json.dumps(blob)
-        r = self.post(
-            '/credentials',
-            body={'credential': ref})
+        blob, ref = unit.new_cert_credential(user_id=self.user['id'])
+
+        r = self.post('/credentials', body={'credential': ref})
         self.assertValidCredentialResponse(r, ref)
         # Assert credential id is not same as hash of access key id for
         # non-ec2 credentials
-        self.assertNotEqual(hashlib.sha256(blob['access']).hexdigest(),
+        access = blob['access'].encode('utf-8')
+        self.assertNotEqual(hashlib.sha256(access).hexdigest(),
                             r.result['credential']['id'])
 
     def test_create_ec2_credential_with_missing_project_id(self):
         """Call ``POST /credentials`` for creating ec2 credential with missing
         project_id.
         """
-        ref = self.new_credential_ref(user_id=self.user['id'])
-        blob = {"access": uuid.uuid4().hex,
-                "secret": uuid.uuid4().hex}
-        ref['blob'] = json.dumps(blob)
-        ref['type'] = 'ec2'
+        _, ref = unit.new_ec2_credential(user_id=self.user['id'],
+                                         project_id=None)
         # Assert bad request status when missing project_id
         self.post(
             '/credentials',
@@ -264,10 +247,10 @@ class CredentialTestCase(CredentialBaseTestCase):
         """Call ``POST /credentials`` for creating ec2 credential with invalid
         blob.
         """
-        ref = self.new_credential_ref(user_id=self.user['id'],
-                                      project_id=self.project_id)
-        ref['blob'] = '{"abc":"def"d}'
-        ref['type'] = 'ec2'
+        ref = unit.new_credential_ref(user_id=self.user['id'],
+                                      project_id=self.project_id,
+                                      blob='{"abc":"def"d}',
+                                      type='ec2')
         # Assert bad request status when request contains invalid blob
         response = self.post(
             '/credentials',
@@ -276,7 +259,7 @@ class CredentialTestCase(CredentialBaseTestCase):
 
     def test_create_credential_with_admin_token(self):
         # Make sure we can create credential with the static admin token
-        ref = self.new_credential_ref(user_id=self.user['id'])
+        ref = unit.new_credential_ref(user_id=self.user['id'])
         r = self.post(
             '/credentials',
             body={'credential': ref},
@@ -325,16 +308,9 @@ class TestCredentialTrustScoped(test_v3.RestfulTestCase):
         token_id = r.headers.get('X-Subject-Token')
 
         # Create the credential with the trust scoped token
-        ref = self.new_credential_ref(user_id=self.user['id'],
-                                      project_id=self.project_id)
-        blob = {"access": uuid.uuid4().hex,
-                "secret": uuid.uuid4().hex}
-        ref['blob'] = json.dumps(blob)
-        ref['type'] = 'ec2'
-        r = self.post(
-            '/credentials',
-            body={'credential': ref},
-            token=token_id)
+        blob, ref = unit.new_ec2_credential(user_id=self.user['id'],
+                                            project_id=self.project_id)
+        r = self.post('/credentials', body={'credential': ref}, token=token_id)
 
         # We expect the response blob to contain the trust_id
         ret_ref = ref.copy()
@@ -345,7 +321,8 @@ class TestCredentialTrustScoped(test_v3.RestfulTestCase):
 
         # Assert credential id is same as hash of access key id for
         # ec2 credentials
-        self.assertEqual(hashlib.sha256(blob['access']).hexdigest(),
+        access = blob['access'].encode('utf-8')
+        self.assertEqual(hashlib.sha256(access).hexdigest(),
                          r.result['credential']['id'])
 
         # Create second ec2 credential with the same access key id and check
@@ -391,19 +368,13 @@ class TestCredentialEc2(CredentialBaseTestCase):
 
     def test_ec2_credential_signature_validate(self):
         """Test signature validation with a v3 ec2 credential."""
-        ref = self.new_credential_ref(
-            user_id=self.user['id'],
-            project_id=self.project_id)
-        blob = {"access": uuid.uuid4().hex,
-                "secret": uuid.uuid4().hex}
-        ref['blob'] = json.dumps(blob)
-        ref['type'] = 'ec2'
-        r = self.post(
-            '/credentials',
-            body={'credential': ref})
+        blob, ref = unit.new_ec2_credential(user_id=self.user['id'],
+                                            project_id=self.project_id)
+        r = self.post('/credentials', body={'credential': ref})
         self.assertValidCredentialResponse(r, ref)
         # Assert credential id is same as hash of access key id
-        self.assertEqual(hashlib.sha256(blob['access']).hexdigest(),
+        access = blob['access'].encode('utf-8')
+        self.assertEqual(hashlib.sha256(access).hexdigest(),
                          r.result['credential']['id'])
 
         cred_blob = json.loads(r.result['credential']['blob'])
@@ -413,7 +384,7 @@ class TestCredentialEc2(CredentialBaseTestCase):
 
     def test_ec2_credential_signature_validate_legacy(self):
         """Test signature validation with a legacy v3 ec2 credential."""
-        cred_json, credential_id = self._create_dict_blob_credential()
+        cred_json, _ = self._create_dict_blob_credential()
         cred_blob = json.loads(cred_json)
         self._validate_signature(access=cred_blob['access'],
                                  secret=cred_blob['secret'])

keystone/tests/unit/test_v3_identity.py

@@ -40,14 +40,12 @@ class IdentityTestCase(test_v3.RestfulTestCase):
         self.group = self.identity_api.create_group(self.group)
         self.group_id = self.group['id']
 
-        self.credential_id = uuid.uuid4().hex
-        self.credential = self.new_credential_ref(
+        self.credential = unit.new_credential_ref(
             user_id=self.user['id'],
             project_id=self.project_id)
-        self.credential['id'] = self.credential_id
-        self.credential_api.create_credential(
-            self.credential_id,
-            self.credential)
+
+        self.credential_api.create_credential(self.credential['id'],
+                                              self.credential)
 
     # user crud tests
 
@@ -336,15 +334,14 @@ class IdentityTestCase(test_v3.RestfulTestCase):
         r = self.credential_api.get_credential(self.credential['id'])
         self.assertDictEqual(self.credential, r)
         # Create a second credential with a different user
+
         user2 = unit.new_user_ref(domain_id=self.domain['id'],
                                   project_id=self.project['id'])
         user2 = self.identity_api.create_user(user2)
-        self.credential2 = self.new_credential_ref(
-            user_id=user2['id'],
-            project_id=self.project['id'])
-        self.credential_api.create_credential(
-            self.credential2['id'],
-            self.credential2)
+        credential2 = unit.new_credential_ref(user_id=user2['id'],
+                                              project_id=self.project['id'])
+        self.credential_api.create_credential(credential2['id'], credential2)
+
         # Create a token for this user which we can check later
         # gets deleted
         auth_data = self.build_authentication_request(
@@ -371,8 +368,8 @@ class IdentityTestCase(test_v3.RestfulTestCase):
             self.user['id'])
         self.assertEqual(0, len(tokens))
         # But the credential for user2 is unaffected
-        r = self.credential_api.get_credential(self.credential2['id'])
-        self.assertDictEqual(self.credential2, r)
+        r = self.credential_api.get_credential(credential2['id'])
+        self.assertDictEqual(credential2, r)
 
     # group crud tests
 

keystone/tests/unit/test_v3_protection.py

@@ -1021,13 +1021,12 @@ class IdentityTestv3CloudPolicySample(test_v3.RestfulTestCase,
         self.get(entity_url, auth=self.auth)
 
     def test_list_user_credentials(self):
-        self.credential_user = self.new_credential_ref(self.just_a_user['id'])
-        self.credential_api.create_credential(self.credential_user['id'],
-                                              self.credential_user)
-        self.credential_admin = self.new_credential_ref(
-            self.cloud_admin_user['id'])
-        self.credential_api.create_credential(self.credential_admin['id'],
-                                              self.credential_admin)
+        credential_user = unit.new_credential_ref(self.just_a_user['id'])
+        self.credential_api.create_credential(credential_user['id'],
+                                              credential_user)
+        credential_admin = unit.new_credential_ref(self.cloud_admin_user['id'])
+        self.credential_api.create_credential(credential_admin['id'],
+                                              credential_admin)
 
         self.auth = self.build_authentication_request(
             user_id=self.just_a_user['id'],

keystone/tests/unit/test_v3_resource.py

@@ -190,7 +190,7 @@ class ResourceTestCase(test_v3.RestfulTestCase,
         group = unit.new_group_ref(domain_id=self.domain_id)
         group = self.identity_api.create_group(group)
 
-        credential = self.new_credential_ref(user_id=self.user['id'],
+        credential = unit.new_credential_ref(user_id=self.user['id'],
                                              project_id=self.project_id)
         self.credential_api.create_credential(credential['id'], credential)
 
@@ -208,9 +208,10 @@ class ResourceTestCase(test_v3.RestfulTestCase,
         group2 = unit.new_group_ref(domain_id=domain2['id'])
         group2 = self.identity_api.create_group(group2)
 
-        credential2 = self.new_credential_ref(user_id=user2['id'],
+        credential2 = unit.new_credential_ref(user_id=user2['id'],
                                               project_id=project2['id'])
-        self.credential_api.create_credential(credential2['id'], credential2)
+        self.credential_api.create_credential(credential2['id'],
+                                              credential2)
 
         # Now disable the new domain and delete it
         domain2['enabled'] = False
@@ -1023,7 +1024,7 @@ class ResourceTestCase(test_v3.RestfulTestCase,
         also deleted, while other credentials are unaffected.
 
         """
-        credential = self.new_credential_ref(user_id=self.user['id'],
+        credential = unit.new_credential_ref(user_id=self.user['id'],
                                              project_id=self.project_id)
         self.credential_api.create_credential(credential['id'], credential)
 
@@ -1033,9 +1034,8 @@ class ResourceTestCase(test_v3.RestfulTestCase,
         # Create a second credential with a different project
         project2 = unit.new_project_ref(domain_id=self.domain['id'])
         self.resource_api.create_project(project2['id'], project2)
-        credential2 = self.new_credential_ref(
-            user_id=self.user['id'],
-            project_id=project2['id'])
+        credential2 = unit.new_credential_ref(user_id=self.user['id'],
+                                              project_id=project2['id'])
         self.credential_api.create_credential(credential2['id'], credential2)
 
         # Now delete the project