new_contents: import datetime
  import unittest
  
  import gevent
  import gevent.socket
  
  import pymssql
  from .helpers import pymssqlconn
  
  
  class GreenletTests(unittest.TestCase):
  
      def greenlet_run(self, num):
          with pymssqlconn() as conn:
              cur = conn.cursor()
              cur.execute("""
              WAITFOR DELAY '00:00:05'  -- sleep for 5 seconds
              SELECT CURRENT_TIMESTAMP
              """)
              row = cur.fetchone()
  
      def _run_all_greenlets(self):
          greenlets = []
  
          dt1 = datetime.datetime.now()
  
          for i in range(5):
              gevent.sleep(1)
              greenlets.append(gevent.spawn(self.greenlet_run, i))
  
          gevent.joinall(greenlets)
  
          dt2 = datetime.datetime.now()
  
          return dt2 - dt1
  
      def test_fast(self):
          def wait_callback(read_fileno):
              gevent.socket.wait_read(read_fileno)
  
          pymssql.set_wait_callback(wait_callback)
  
          elapsed_time = self._run_all_greenlets()
  
          self.assertTrue(
              elapsed_time < datetime.timedelta(seconds=20),
              'elapsed_time < 20 seconds')
  
  
  suite = unittest.TestSuite()
  suite.addTest(unittest.makeSuite(GreenletTests))
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Add test for green query with gevent