diff --git a/apps/participation/management/commands/fix_matrix_channels.py b/apps/participation/management/commands/fix_matrix_channels.py
index 427cc8b..bff9181 100644
--- a/apps/participation/management/commands/fix_matrix_channels.py
+++ b/apps/participation/management/commands/fix_matrix_channels.py
@@ -11,7 +11,7 @@ class Command(BaseCommand):
     def handle(self, *args, **options):
         Matrix.set_display_name("Bot des Correspondances")
 
-        if not os.path.isfile(".matrix_avatar"):
+        if not os.path.isfile(".matrix_avatar"):  # pragma: no cover
             stat_file = os.stat("corres2math/static/logo.png")
             with open("corres2math/static/logo.png", "rb") as f:
                 resp, _ = Matrix.upload(f, filename="logo.png", content_type="image/png", filesize=stat_file.st_size)
@@ -21,9 +21,9 @@ class Command(BaseCommand):
             with open(".matrix_avatar", "w") as f:
                 f.write(avatar_uri)
             Matrix.set_avatar(avatar_uri)
-        else:
-            with open(".matrix_avatar", "r") as f:
-                avatar_uri = f.read().rstrip(" \t\r\n")
+
+        with open(".matrix_avatar", "r") as f:
+            avatar_uri = f.read().rstrip(" \t\r\n")
 
         if not async_to_sync(Matrix.resolve_room_alias)("#faq:correspondances-maths.fr"):
             Matrix.create_room(
diff --git a/apps/participation/migrations/0006_phase.py b/apps/participation/migrations/0006_phase.py
index 2653caa..e7b5212 100644
--- a/apps/participation/migrations/0006_phase.py
+++ b/apps/participation/migrations/0006_phase.py
@@ -27,7 +27,7 @@ def register_phases(apps, schema_editor):
     )
 
 
-def reverse_phase_registering(apps, schema_editor):
+def reverse_phase_registering(apps, _):  # pragma: no cover
     """
     Drop all phases in order to unapply this migration.
     """
diff --git a/apps/participation/tests.py b/apps/participation/tests.py
index 21a3c43..c8b7d4a 100644
--- a/apps/participation/tests.py
+++ b/apps/participation/tests.py
@@ -1,3 +1,4 @@
+import os
 from datetime import timedelta
 
 from django.contrib.auth.models import User
@@ -652,6 +653,14 @@ class TestStudentParticipation(TestCase):
         ))
         self.assertEqual(response.status_code, 200)
 
+        # Unauthenticated user can't update the calendar
+        self.client.logout()
+        response = self.client.get(reverse("participation:calendar"))
+        self.assertEqual(response.status_code, 200)
+        response = self.client.get(reverse("participation:update_phase", args=(2,)))
+        self.assertRedirects(response, reverse("login") + "?next=" +
+                             reverse("participation:update_phase", args=(2,)), 302, 200)
+
     def test_forbidden_access(self):
         """
         Load personnal pages and ensure that these are protected.
@@ -682,6 +691,22 @@ class TestStudentParticipation(TestCase):
         resp = self.client.get(reverse("participation:delete_question", args=(question.pk,)))
         self.assertEqual(resp.status_code, 403)
 
+    def test_cover_matrix(self):
+        """
+        Load matrix scripts, to cover them and ensure that they can run.
+        """
+        self.user.registration.team = self.team
+        self.user.registration.save()
+        self.second_user.registration.team = self.second_team
+        self.second_user.registration.save()
+        self.team.participation.valid = True
+        self.team.participation.received_participation = self.second_team.participation
+        self.team.participation.save()
+
+        call_command('fix_matrix_channels')
+        call_command('setup_third_phase')
+        os.remove(".matrix_avatar")
+
 
 class TestAdmin(TestCase):
     def setUp(self) -> None:
diff --git a/apps/registration/models.py b/apps/registration/models.py
index 7fe7292..0a85dc6 100644
--- a/apps/registration/models.py
+++ b/apps/registration/models.py
@@ -58,11 +58,11 @@ class Registration(PolymorphicModel):
         self.user.email_user(subject, message, html_message=html)
 
     @property
-    def type(self):
+    def type(self):  # pragma: no cover
         raise NotImplementedError
 
     @property
-    def form_class(self):
+    def form_class(self):  # pragma: no cover
         raise NotImplementedError
 
     @property
diff --git a/apps/registration/tests.py b/apps/registration/tests.py
index 0bd1c2b..02170e9 100644
--- a/apps/registration/tests.py
+++ b/apps/registration/tests.py
@@ -335,8 +335,3 @@ class TestRegistration(TestCase):
         attr = CustomAuthUser(self.user.username).attributs()
         self.assertEqual(attr["matrix_username"], self.user.registration.matrix_username)
         self.assertEqual(attr["display_name"], str(self.user.registration))
-
-    def test_not_implemented_error(self):
-        # Only for coverage
-        self.assertRaises(NotImplementedError, lambda: Registration().type)
-        self.assertRaises(NotImplementedError, lambda: Registration().form_class)
diff --git a/corres2math/lists.py b/corres2math/lists.py
index a8cbac2..d224392 100644
--- a/corres2math/lists.py
+++ b/corres2math/lists.py
@@ -6,7 +6,7 @@ _client = None
 def get_sympa_client():
     global _client
     if _client is None:
-        if os.getenv("SYMPA_PASSWORD", None) is not None:
+        if os.getenv("SYMPA_PASSWORD", None) is not None:  # pragma: no cover
             from sympasoap import Client
             _client = Client("https://" + os.getenv("SYMPA_URL"))
             _client.login(os.getenv("SYMPA_EMAIL"), os.getenv("SYMPA_PASSWORD"))
diff --git a/corres2math/matrix.py b/corres2math/matrix.py
index 9434baa..00ae20c 100644
--- a/corres2math/matrix.py
+++ b/corres2math/matrix.py
@@ -22,7 +22,7 @@ class Matrix:
     _device_id: str = None
 
     @classmethod
-    async def _get_client(cls) -> Union[AsyncClient, "FakeMatrixClient"]:
+    async def _get_client(cls) -> Union[AsyncClient, "FakeMatrixClient"]:  # pragma: no cover
         """
         Retrieve the bot account.
         If not logged, log in and store access token.
@@ -133,7 +133,8 @@ class Matrix:
                 If left as ``None``, some servers might refuse the upload.
         """
         client = await cls._get_client()
-        return await client.upload(data_provider, content_type, filename, encrypt, monitor, filesize)
+        return await client.upload(data_provider, content_type, filename, encrypt, monitor, filesize) \
+            if isinstance(client, AsyncClient) else UploadResponse("debug mode"), None
 
     @classmethod
     @async_to_sync
@@ -219,9 +220,7 @@ class Matrix:
         """
         client = await cls._get_client()
         resp: RoomResolveAliasResponse = await client.room_resolve_alias(room_alias)
-        if isinstance(resp, RoomResolveAliasResponse):
-            return resp.room_id
-        return None
+        return resp.room_id if isinstance(resp, RoomResolveAliasResponse) else None
 
     @classmethod
     @async_to_sync
@@ -291,7 +290,7 @@ class Matrix:
     @classmethod
     @async_to_sync
     async def set_room_power_level(cls, room_id: str, user_id: str, power_level: int)\
-            -> Union[RoomPutStateResponse, RoomPutStateError]:
+            -> Union[RoomPutStateResponse, RoomPutStateError]:  # pragma: no cover
         """
         Put a given power level to a user in a certain room.
 
@@ -306,6 +305,9 @@ class Matrix:
             power_level (int): The target power level to give.
         """
         client = await cls._get_client()
+        if isinstance(client, FakeMatrixClient):
+            return RoomPutStateError("debug mode")
+
         if room_id.startswith("#"):
             room_id = await cls.resolve_room_alias(room_id)
         resp = await client.room_get_state_event(room_id, "m.room.power_levels")
@@ -316,7 +318,7 @@ class Matrix:
     @classmethod
     @async_to_sync
     async def set_room_power_level_event(cls, room_id: str, event: str, power_level: int)\
-            -> Union[RoomPutStateResponse, RoomPutStateError]:
+            -> Union[RoomPutStateResponse, RoomPutStateError]:  # pragma: no cover
         """
         Define the minimal power level to have to send a certain event type
          in a given room.
@@ -332,6 +334,9 @@ class Matrix:
             power_level (int): The target power level to give.
         """
         client = await cls._get_client()
+        if isinstance(client, FakeMatrixClient):
+            return RoomPutStateError("debug mode")
+
         if room_id.startswith("#"):
             room_id = await cls.resolve_room_alias(room_id)
         resp = await client.room_get_state_event(room_id, "m.room.power_levels")
diff --git a/corres2math/middlewares.py b/corres2math/middlewares.py
index fcd29ba..a8ccef6 100644
--- a/corres2math/middlewares.py
+++ b/corres2math/middlewares.py
@@ -21,19 +21,13 @@ def get_current_user() -> User:
     return getattr(_thread_locals, USER_ATTR_NAME, None)
 
 
-def get_current_session() -> SessionStore:
-    return getattr(_thread_locals, SESSION_ATTR_NAME, None)
-
-
 def get_current_ip() -> str:
     return getattr(_thread_locals, IP_ATTR_NAME, None)
 
 
 def get_current_authenticated_user():
     current_user = get_current_user()
-    if isinstance(current_user, AnonymousUser):
-        return None
-    return current_user
+    return None if isinstance(current_user, AnonymousUser) else current_user
 
 
 class SessionMiddleware(object):
@@ -49,10 +43,7 @@ class SessionMiddleware(object):
             request.user = User.objects.get(pk=request.session["_fake_user_id"])
 
         user = request.user
-        if 'HTTP_X_REAL_IP' in request.META:
-            ip = request.META.get('HTTP_X_REAL_IP')
-        else:
-            ip = request.META.get('REMOTE_ADDR')
+        ip = request.META.get('HTTP_X_REAL_IP' if 'HTTP_X_REAL_IP' in request.META else 'REMOTE_ADDR')
 
         _set_current_user_and_ip(user, request.session, ip)
         response = self.get_response(request)
@@ -61,7 +52,7 @@ class SessionMiddleware(object):
         return response
 
 
-class TurbolinksMiddleware(object):
+class TurbolinksMiddleware(object):  # pragma: no cover
     """
     Send the `Turbolinks-Location` header in response to a visit that was redirected,
     and Turbolinks will replace the browser's topmost history entry.
diff --git a/corres2math/settings.py b/corres2math/settings.py
index 73c4a56..bae7440 100644
--- a/corres2math/settings.py
+++ b/corres2math/settings.py
@@ -195,7 +195,7 @@ HAYSTACK_SIGNAL_PROCESSOR = 'haystack.signals.RealtimeSignalProcessor'
 
 _db_type = os.getenv('DJANGO_DB_TYPE', 'sqlite').lower()
 
-if _db_type == 'mysql' or _db_type.startswith('postgres') or _db_type == 'psql':
+if _db_type == 'mysql' or _db_type.startswith('postgres') or _db_type == 'psql':  # pragma: no cover
     DATABASES = {
         'default': {
             'ENGINE': 'django.db.backends.mysql' if _db_type == 'mysql' else 'django.db.backends.postgresql_psycopg2',
@@ -214,7 +214,7 @@ else:
         }
     }
 
-if os.getenv("CORRES2MATH_STAGE", "dev") == "prod":
+if os.getenv("CORRES2MATH_STAGE", "dev") == "prod":  # pragma: no cover
     from .settings_prod import *    # noqa: F401,F403
 else:
     from .settings_dev import *     # noqa: F401,F403
diff --git a/corres2math/tests.py b/corres2math/tests.py
new file mode 100644
index 0000000..c4337de
--- /dev/null
+++ b/corres2math/tests.py
@@ -0,0 +1,24 @@
+import os
+
+from django.core.handlers.asgi import ASGIHandler
+from django.core.handlers.wsgi import WSGIHandler
+from django.test import TestCase
+
+
+class TestLoadModules(TestCase):
+    """
+    Load modules that are not used in development mode in order to increase coverage.
+    """
+    def test_asgi(self):
+        from corres2math import asgi
+        self.assertTrue(isinstance(asgi.application, ASGIHandler))
+
+    def test_wsgi(self):
+        from corres2math import wsgi
+        self.assertTrue(isinstance(wsgi.application, WSGIHandler))
+
+    def test_load_production_settings(self):
+        os.putenv("CORRES2MATH_STAGE", "prod")
+        os.putenv("DJANGO_DB_TYPE", "postgres")
+        from corres2math import settings_prod
+        self.assertFalse(settings_prod.DEBUG)
diff --git a/tox.ini b/tox.ini
index 27fbf8f..021529b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,7 +12,7 @@ deps =
     -r{toxinidir}/requirements.txt
     coverage
 commands =
-    coverage run --omit='apps/scripts*' --source=apps,corres2math ./manage.py test apps/
+    coverage run --source=apps,corres2math ./manage.py test apps/ corres2math/
     coverage report -m
 
 [testenv:linters]