Fix issue where we didn't delete robots immediately under a namespace

This could result in "hanging" robot accounts, although that would only leak the names of said accounts. Now we delete them immediately AND we proactively delete them before replacing the namespace (just to be sure)

data/model/test/test_user.py

@@ -7,6 +7,8 @@ from mock import patch
 from data.database import EmailConfirmation, User, DeletedNamespace
 from data.model.user import create_user_noverify, validate_reset_code, get_active_users
 from data.model.user import mark_namespace_for_deletion, delete_namespace_via_marker
+from data.model.user import create_robot, lookup_robot, list_namespace_robots
+from data.model.user import InvalidRobotException
 from util.timedeltastring import convert_to_timedelta
 from data.queue import WorkQueue
 from test.fixtures import *
@@ -48,12 +50,30 @@ def test_mark_namespace_for_deletion(initialized_db):
   # Create a user and then mark it for deletion.
   user = create_user_noverify('foobar', 'foo@example.com', email_required=False)
 
+  # Add some robots.
+  create_robot('foo', user)
+  create_robot('bar', user)
+
+  assert lookup_robot('foobar+foo') is not None
+  assert lookup_robot('foobar+bar') is not None
+  assert len(list(list_namespace_robots('foobar'))) == 2
+
   # Mark the user for deletion.
   queue = WorkQueue('testgcnamespace', create_transaction)
   mark_namespace_for_deletion(user, [], queue)
 
   # Ensure the older user is still in the DB.
-  assert User.get(id=user.id).username != 'foobar'
+  older_user = User.get(id=user.id)
+  assert older_user.username != 'foobar'
+
+  # Ensure the robots are deleted.
+  with pytest.raises(InvalidRobotException):
+    assert lookup_robot('foobar+foo')
+
+  with pytest.raises(InvalidRobotException):
+    assert lookup_robot('foobar+bar')
+
+  assert len(list(list_namespace_robots(older_user.username))) == 0
 
   # Ensure we can create a user with the same namespace again.
   new_user = create_user_noverify('foobar', 'foo@example.com', email_required=False)