Remove has_member function from application model

tests/models/test_application.py

@@ -39,16 +39,3 @@ def test_audit_event_for_application_deletion(session):
     )
     assert update_event.changed_state.get("deleted")
     assert update_event.changed_state["deleted"] == [False, True]
-
-
-def test_has_app_member():
-    user = UserFactory.create()
-    app = ApplicationFactory.create()
-    ApplicationRoleFactory.create(user=user, application=app)
-    assert app.has_member(user.id)
-
-
-def test_does_not_have_app_member():
-    user = UserFactory.create()
-    app = ApplicationFactory.create()
-    assert not app.has_member(user.id)

tests/routes/applications/test_settings.py

@@ -192,7 +192,7 @@ def test_check_users_are_in_application():
     for user in [app_user_1, app_user_2, app_user_3]:
         ApplicationRoleFactory.create(user=user, application=application)
 
-    user_ids = [app_user_1.id, app_user_2.id, app_user_3.id]
+    user_ids = [str(app_user_1.id), str(app_user_2.id), str(app_user_3.id)]
     assert check_users_are_in_application(user_ids, application)