diff --git a/tests/test_pagure_flask_api_auth.py b/tests/test_pagure_flask_api_auth.py
index ef76281..ac9e574 100644
--- a/tests/test_pagure_flask_api_auth.py
+++ b/tests/test_pagure_flask_api_auth.py
@@ -22,6 +22,7 @@ from mock import patch
 sys.path.insert(0, os.path.join(os.path.dirname(
     os.path.abspath(__file__)), '..'))
 
+import pagure.api
 import pagure.lib
 import tests
 
@@ -47,28 +48,18 @@ class PagureFlaskApiAuthtests(tests.Modeltests):
         output = self.app.post('/api/0/foo/new_issue')
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-              "error": "Invalid or expired token. Please visit " \
-                  "https://pagure.org/ to get or renew your API token.",
-              "error_code": "EINVALIDTOK",
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         headers = {'Authorization': 'token aabbbccc'}
 
         output = self.app.post('/api/0/foo/new_issue', headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-              "error": "Invalid or expired token. Please visit " \
-                  "https://pagure.org/ to get or renew your API token.",
-              "error_code": "EINVALIDTOK",
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
     def test_auth_noacl(self):
         """ Test the authentication when the token does not have any ACL.
@@ -79,28 +70,18 @@ class PagureFlaskApiAuthtests(tests.Modeltests):
         output = self.app.post('/api/0/test/new_issue')
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-              "error": "Invalid or expired token. Please visit " \
-                  "https://pagure.org/ to get or renew your API token.",
-              "error_code": "EINVALIDTOK",
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         headers = {'Authorization': 'token aaabbbcccddd'}
 
         output = self.app.post('/api/0/test/new_issue', headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-              "error": "Invalid or expired token. Please visit " \
-                  "https://pagure.org/ to get or renew your API token.",
-              "error_code": "EINVALIDTOK",
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
     def test_auth_expired(self):
         """ Test the authentication when the token has expired.
@@ -111,28 +92,18 @@ class PagureFlaskApiAuthtests(tests.Modeltests):
         output = self.app.post('/api/0/test/new_issue')
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-              "error": "Invalid or expired token. Please visit " \
-                  "https://pagure.org/ to get or renew your API token.",
-              "error_code": "EINVALIDTOK",
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         headers = {'Authorization': 'token expired_token'}
 
         output = self.app.post('/api/0/test/new_issue', headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-              "error": "Invalid or expired token. Please visit " \
-                  "https://pagure.org/ to get or renew your API token.",
-              "error_code": "EINVALIDTOK",
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
     def test_auth(self):
         """ Test the token based authentication.
@@ -144,14 +115,9 @@ class PagureFlaskApiAuthtests(tests.Modeltests):
         output = self.app.post('/api/0/test/new_issue')
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-              "error": "Invalid or expired token. Please visit " \
-                  "https://pagure.org/ to get or renew your API token.",
-              "error_code": "EINVALIDTOK",
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         headers = {'Authorization': 'token aaabbbcccddd'}
 
diff --git a/tests/test_pagure_flask_api_fork.py b/tests/test_pagure_flask_api_fork.py
index 9ade4c8..916a6a6 100644
--- a/tests/test_pagure_flask_api_fork.py
+++ b/tests/test_pagure_flask_api_fork.py
@@ -23,6 +23,7 @@ from mock import patch
 sys.path.insert(0, os.path.join(os.path.dirname(
     os.path.abspath(__file__)), '..'))
 
+import pagure.api
 import pagure.lib
 import tests
 
@@ -341,14 +342,9 @@ class PagureFlaskApiForktests(tests.Modeltests):
             '/api/0/test2/pull-request/1/close', headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-              "error": "Invalid or expired token. Please visit " \
-                  "https://pagure.org/ to get or renew your API token.",
-              "error_code": "EINVALIDTOK",
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         # Invalid PR
         output = self.app.post(
@@ -455,14 +451,9 @@ class PagureFlaskApiForktests(tests.Modeltests):
             '/api/0/test2/pull-request/1/merge', headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-              "error": "Invalid or expired token. Please visit " \
-                  "https://pagure.org/ to get or renew your API token.",
-              "error_code": "EINVALIDTOK",
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         # Invalid PR
         output = self.app.post(
@@ -550,14 +541,9 @@ class PagureFlaskApiForktests(tests.Modeltests):
             '/api/0/test2/pull-request/1/comment', headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-              "error": "Invalid or expired token. Please visit " \
-                  "https://pagure.org/ to get or renew your API token.",
-              "error_code": "EINVALIDTOK",
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         # No input
         output = self.app.post(
@@ -664,14 +650,9 @@ class PagureFlaskApiForktests(tests.Modeltests):
             '/api/0/test2/pull-request/1/flag', headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-              "error": "Invalid or expired token. Please visit " \
-                  "https://pagure.org/ to get or renew your API token.",
-              "error_code": "EINVALIDTOK",
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         # No input
         output = self.app.post(
diff --git a/tests/test_pagure_flask_api_issue.py b/tests/test_pagure_flask_api_issue.py
index 7bd337d..60c20e1 100644
--- a/tests/test_pagure_flask_api_issue.py
+++ b/tests/test_pagure_flask_api_issue.py
@@ -57,14 +57,9 @@ class PagureFlaskApiIssuetests(tests.Modeltests):
         output = self.app.post('/api/0/test2/new_issue', headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-              "error": "Invalid or expired token. Please visit " \
-                  "https://pagure.org/ to get or renew your API token.",
-              "error_code": "EINVALIDTOK",
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         # No input
         output = self.app.post('/api/0/test/new_issue', headers=headers)
@@ -540,13 +535,9 @@ class PagureFlaskApiIssuetests(tests.Modeltests):
         output = self.app.get('/api/0/test/issue/2', headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-              "error": "Invalid or expired token. Please visit https://pagure.org/ to get or renew your API token.",
-              "error_code": "EINVALIDTOK"
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         # Create a new token for another user
         item = pagure.lib.model.Token(
@@ -657,14 +648,9 @@ class PagureFlaskApiIssuetests(tests.Modeltests):
         output = self.app.post('/api/0/test2/issue/1/status', headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-              "error": "Invalid or expired token. Please visit " \
-                  "https://pagure.org/ to get or renew your API token.",
-              "error_code": "EINVALIDTOK",
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         # No input
         output = self.app.post('/api/0/test/issue/1/status', headers=headers)
@@ -802,14 +788,9 @@ class PagureFlaskApiIssuetests(tests.Modeltests):
             '/api/0/foo/issue/1/status', data=data, headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-                "error": "Invalid or expired token. Please "
-                "visit https://pagure.org/ to get or renew your API token.",
-                "error_code": "EINVALIDTOK"
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
     @patch('pagure.lib.git.update_git')
     @patch('pagure.lib.notify.send_email')
@@ -840,14 +821,9 @@ class PagureFlaskApiIssuetests(tests.Modeltests):
         output = self.app.post('/api/0/test2/issue/1/comment', headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-              "error": "Invalid or expired token. Please visit " \
-                  "https://pagure.org/ to get or renew your API token.",
-              "error_code": "EINVALIDTOK",
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         # No input
         output = self.app.post('/api/0/test/issue/1/comment', headers=headers)
@@ -982,14 +958,9 @@ class PagureFlaskApiIssuetests(tests.Modeltests):
             '/api/0/foo/issue/1/comment', data=data, headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-                "error": "Invalid or expired token. Please "
-                "visit https://pagure.org/ to get or renew your API token.",
-                "error_code": "EINVALIDTOK"
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         # No comment added
         repo = pagure.lib.get_project(self.session, 'foo')
@@ -1166,14 +1137,9 @@ class PagureFlaskApiIssuetests(tests.Modeltests):
         output = self.app.post('/api/0/test2/issue/1/assign', headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-              "error": "Invalid or expired token. Please visit " \
-                  "https://pagure.org/ to get or renew your API token.",
-              "error_code": "EINVALIDTOK",
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         # No input
         output = self.app.post('/api/0/test/issue/1/assign', headers=headers)
@@ -1308,14 +1274,9 @@ class PagureFlaskApiIssuetests(tests.Modeltests):
             '/api/0/foo/issue/1/assign', data=data, headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-                "error": "Invalid or expired token. Please "
-                "visit https://pagure.org/ to get or renew your API token.",
-                "error_code": "EINVALIDTOK"
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         # No comment added
         repo = pagure.lib.get_project(self.session, 'foo')
diff --git a/tests/test_pagure_flask_api_project.py b/tests/test_pagure_flask_api_project.py
index 4792e53..039becf 100644
--- a/tests/test_pagure_flask_api_project.py
+++ b/tests/test_pagure_flask_api_project.py
@@ -249,14 +249,9 @@ class PagureFlaskApiProjecttests(tests.Modeltests):
         output = self.app.post('/api/0/new', headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-                "error": "Invalid or expired token. Please visit " \
-                "https://pagure.org/ to get or renew your API token.",
-                "error_code": "EINVALIDTOK"
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         headers = {'Authorization': 'token aaabbbcccddd'}
 
@@ -340,14 +335,9 @@ class PagureFlaskApiProjecttests(tests.Modeltests):
         output = self.app.post('/api/0/fork', headers=headers)
         self.assertEqual(output.status_code, 401)
         data = json.loads(output.data)
-        self.assertDictEqual(
-            data,
-            {
-                "error": "Invalid or expired token. Please visit " \
-                "https://pagure.org/ to get or renew your API token.",
-                "error_code": "EINVALIDTOK"
-            }
-        )
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.name,
+                         data['error_code'])
+        self.assertEqual(pagure.api.APIERROR.EINVALIDTOK.value, data['error'])
 
         headers = {'Authorization': 'token aaabbbcccddd'}
 
diff --git a/tests/test_pagure_flask_ui_issues.py b/tests/test_pagure_flask_ui_issues.py
index e68de08..77f863e 100644
--- a/tests/test_pagure_flask_ui_issues.py
+++ b/tests/test_pagure_flask_ui_issues.py
@@ -565,9 +565,9 @@ class PagureFlaskIssuestests(tests.Modeltests):
                 '<option selected value="Fixed">Fixed</option>'
                 in output.data)
             self.assertIn(
-                '<small><p><a href="https://pagure.org/user/pingou"> '
+                '<small><p><a href="{app_url}/user/pingou"> '
                 '@pingou</a> changed the status to <code>Fixed</code>'
-                '</p></small>',
+                '</p></small>'.format(app_url=pagure.APP.config['APP_URL']),
                 output.data)
 
             # Add new comment