Resolve "Deleting persons is impossible"

Closes #487 (closed)

aleksis/core/tests/models/test_person.py

@@ -9,3 +9,9 @@ def test_full_name():
     _person = Person.objects.create(first_name="Jane", last_name="Doe")
 
     assert _person.full_name == "Doe, Jane"
+
+
+def test_delete():
+    _person = Person.objects.create(first_name="Jane", last_name="Doe")
+    _person.delete()
+    assert not Person.objects.filter(first_name="Jane", last_name="Doe").exists()