Tests should not depend on Matrix-nio, that uses lxml that needs a lot of dependencies and a lot of time to build

tox.ini

@@ -7,10 +7,21 @@ envlist =
 skipsdist = True
 
 [testenv]
-sitepackages = True
+sitepackages = False
 deps =
-    -r{toxinidir}/requirements.txt
     coverage
+    Django~=3.1
+    django-bootstrap-datepicker-plus~=3.0
+    django-cas-server~=1.2
+    django-crispy-forms~=1.9
+    django-filter~=2.3
+    django-haystack~=3.0
+    django-polymorphic~=3.0
+    django-tables2~=2.3
+    djangorestframework~=3.12
+    django-rest-polymorphic~=0.1
+    python-magic~=0.4
+    whoosh~=2.7
 commands =
     coverage run --source=apps,corres2math ./manage.py test apps/ corres2math/
     coverage report -m