Move apps in main directory

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

logs/tests.py

@@ -0,0 +1,21 @@
+from django.contrib.auth.models import User
+from django.contrib.contenttypes.models import ContentType
+from django.core.exceptions import ValidationError
+from django.test import TestCase
+
+from .models import Changelog
+
+
+class TestChangelog(TestCase):
+    def test_logs(self):
+        user = User.objects.create(email="admin@example.com")
+        self.assertTrue(Changelog.objects.filter(action="create", instance_pk=user.pk,
+                                                 model=ContentType.objects.get_for_model(User)).exists())
+        old_user_pk = user.pk
+        user.delete()
+        self.assertTrue(Changelog.objects.filter(action="delete", instance_pk=old_user_pk,
+                                                 model=ContentType.objects.get_for_model(User)).exists())
+
+        changelog = Changelog.objects.first()
+        self.assertRaises(ValidationError, changelog.delete)
+        str(Changelog.objects.all())