diff --git a/mayan/apps/common/tests/base.py b/mayan/apps/common/tests/base.py
index 086179b17b..5142902ce1 100644
--- a/mayan/apps/common/tests/base.py
+++ b/mayan/apps/common/tests/base.py
@@ -2,10 +2,10 @@ from __future__ import unicode_literals
 
 from django.test import TestCase
 
-from .mixins import OpenFileCheckMixin, TempfileCheckMixin
+from .mixins import ContentTypeCheckMixin, OpenFileCheckMixin, TempfileCheckMixin
 
 
-class BaseTestCase(OpenFileCheckMixin, TempfileCheckMixin, TestCase):
+class BaseTestCase(ContentTypeCheckMixin, OpenFileCheckMixin, TempfileCheckMixin, TestCase):
     """
     This is the most basic test case class any test in the project should use.
     """
diff --git a/mayan/apps/common/tests/mixins.py b/mayan/apps/common/tests/mixins.py
index 844585ecef..cd8be439a0 100644
--- a/mayan/apps/common/tests/mixins.py
+++ b/mayan/apps/common/tests/mixins.py
@@ -7,6 +7,30 @@ import psutil
 from ..settings import setting_temporary_directory
 
 
+class ContentTypeCheckMixin(object):
+    expected_content_type = 'text/html; charset=utf-8'
+
+    def _pre_setup(self):
+        super(ContentTypeCheckMixin, self)._pre_setup()
+        test_instance = self
+
+        class CustomClient(self.client_class):
+            def request(self, *args, **kwargs):
+                response = super(CustomClient, self).request(*args, **kwargs)
+
+                content_type = response._headers['content-type'][1]
+                test_instance.assertEqual(
+                    content_type, test_instance.expected_content_type,
+                    msg='Unexpected response content type: {}, expected: {}.'.format(
+                        content_type, test_instance.expected_content_type
+                    )
+                )
+
+                return response
+
+        self.client = CustomClient()
+
+
 class TempfileCheckMixin(object):
     def _get_temporary_entries_count(self):
         return len(os.listdir(setting_temporary_directory.value))