[tests] Ensure it is ok the enter the same name twice

collector/tests.py

@@ -5,8 +5,9 @@ from hypothesis import given, strategies as st
 
 from .models import Teil
 
+names = st.text(alphabet=st.characters(exclude_categories=["C"]), min_size=1)
 
-@given(data=st.text(alphabet=st.characters(exclude_categories=["C"])))
+@given(data=names)
 def test_submitted_data_ends_up_in_database(data, session: Client):
 
     with pytest.raises(Teil.DoesNotExist):
@@ -16,3 +17,19 @@ def test_submitted_data_ends_up_in_database(data, session: Client):
 
     assert response.status_code == 302
     assert Teil.objects.get(name=data)
+
+
+@given(data=names)
+def test_entering_same_name_twice_does_not_change_database_entry(data, session: Client):
+    assert not Teil.objects.filter(name=data).exists()
+
+    response = session.post(reverse("collector:enter"), data={"new_name": data})
+    assert response.status_code == 302
+
+    assert Teil.objects.filter(name=data).count() == 1
+
+    response = session.post(reverse("collector:enter"), data={"new_name": data})
+    assert response.status_code == 302
+
+    assert Teil.objects.filter(name=data).count() == 1
+