diff --git a/tests/test_source_maarch.py b/tests/test_source_maarch.py
index 85fc0ed..2d908d4 100644
--- a/tests/test_source_maarch.py
+++ b/tests/test_source_maarch.py
@@ -19,6 +19,7 @@ import json
 import pytest
 
 from django.contrib.auth.models import User
+from django.utils.encoding import force_text
 
 from httmock import urlmatch, HTTMock
 
@@ -56,6 +57,7 @@ class MaarchMock(BaseMock):
             'headers': {
                 'content-type': 'application/json',
             },
+            'status_code': 200,
         }
     list_endpoint.path = '^/rest/res/list$'
 
@@ -71,6 +73,7 @@ class MaarchMock(BaseMock):
             'headers': {
                 'content-type': 'application/json',
             },
+            'status_code': 200,
         }
     update_status.path = '^/rest/res/resource/status$'
 
@@ -152,7 +155,7 @@ def test_utils(maarch):
     assert welco_maarch_obj.grc_refused_status == 'GRCREFUSED'
 
 
-PDF_MOCK = '%PDF-1.4 ...'
+PDF_MOCK = b'%PDF-1.4 ...'
 
 
 def test_feed(settings, app, maarch, wcs, user):
@@ -173,7 +176,7 @@ def test_feed(settings, app, maarch, wcs, user):
             'resources': [
                 {
                     'res_id': 1,
-                    'fileBase64Content': base64.b64encode(PDF_MOCK),
+                    'fileBase64Content': force_text(base64.b64encode(PDF_MOCK)),
                 }
             ],
         })
@@ -250,7 +253,7 @@ def test_feed(settings, app, maarch, wcs, user):
     user.set_password('test')
     user.save()
     # verify authentication error
-    response = app.post_json('/api/mail/response/', params={}, status=403)
+    response = app.post_json('/api/mail/response/', params={}, status=(401, 403))
     app.authorization = ('Basic', ('test', 'test'))
     # verify serializer error
     response = app.post_json('/api/mail/response/', params={}, status=400)