diff --git a/conftest.py b/conftest.py
index ec683b154d6e..41728ac5b90f 100644
--- a/conftest.py
+++ b/conftest.py
@@ -2,6 +2,8 @@
 Default unit test configuration and fixtures.
 """
 from __future__ import absolute_import, unicode_literals
+from unittest import TestCase
+
 import pytest
 
 # Import hooks and fixture overrides from the cms package to
@@ -9,6 +11,10 @@
 
 from cms.conftest import _django_clear_site_cache, pytest_configure  # pylint: disable=unused-import
 
+# When using self.assertEquals, diffs are truncated. We don't want that, always
+# show the whole diff.
+TestCase.maxDiff = None
+
 
 @pytest.fixture(autouse=True)
 def no_webpack_loader(monkeypatch):