Turning off signals dispatch when testing units

Model signals pre_save and post_save will be turned off when running
unit tests because they are interfering with the tests.

tests/unit/conftest.py

@@ -0,0 +1,10 @@
+from django.db.models import signals
+
+
+def disconnect_signals():
+    signals.pre_save.receivers = []
+    signals.post_save.receivers = []
+
+
+def pytest_runtest_setup(item):
+    disconnect_signals()