diff --git a/kallithea/tests/__init__.py b/kallithea/tests/__init__.py
--- a/kallithea/tests/__init__.py
+++ b/kallithea/tests/__init__.py
@@ -20,3 +20,7 @@ Refer to docs/contributing.rst for detai
 
 import pytest
 
+if getattr(pytest, 'register_assert_rewrite', None):
+    # make sure that all asserts under kallithea/tests benefit from advanced
+    # assert reporting with pytest-3.0.0+.
+    pytest.register_assert_rewrite('kallithea.tests.')