PYTHON-1003 Test _list_collections uses one socket at a time.

Author: ajdavis

test/test_database.py

@@ -173,6 +173,17 @@ def test_collection_names(self):
  finally:
  self.client.drop_database("many_collections")
 
+ def test_collection_names_single_socket(self):
+ # Test that Database.collection_names only requires one socket.
+ client = rs_or_single_client(maxPoolSize=1)
+ client.drop_database('test_collection_names_single_socket')
+ db = client.test_collection_names_single_socket
+ for i in range(200):
+ db.create_collection(str(i))
+
+ db.collection_names() # Must not hang.
+ client.drop_database('test_collection_names_single_socket')
+
  def test_drop_collection(self):
  db = Database(self.client, "pymongo_test")