title: Use mock MongoDB server for unit test
body: <p>I have to implement nosetests for Python code using a MongoDB store. Is there any python library which permits me initializing a mock in-memory MongoDB server?</p>
  
  <p>I am using continuous integration. So, I want my tests to be independent of any MongoDB running server. 
  Is there a way to mock mongoDM Server in memory to test the code independently of connecting to a Mongo server?</p>
  
  <p>Thanks in advance!</p>