new_contents: import amostra.mongo_client
  from pymongo import MongoClient
  import pytest
  
  
  connection = MongoClient('localhost', 27017)
  db = connection['tests-amostra']
  db['samples'].drop()
  db['samples_revisions'].drop()
  
  
  @pytest.fixture()
  def client():
      client = amostra.mongo_client.Client('mongodb://localhost:27017/tests-amostra')
      return client
  
subject: Add conftest.py with mongo configuration for tests