text: # -*- coding: utf-8 -*-
  import pytest
  import asyncio
  from paco import dropwhile
  from .helpers import run_in_loop
  
  
  @asyncio.coroutine
  def coro(num):
      return num < 4
  
  
  def test_dropwhile():
      task = dropwhile(coro, [1, 2, 3, 4, 3, 1])
      assert run_in_loop(task) == [4, 3, 1]
  
  
  def test_dropwhile_empty():
      task = dropwhile(coro, [])
      assert run_in_loop(task) == []
  
  
  def test_dropwhile_invalid_input():
      with pytest.raises(TypeError):
          run_in_loop(dropwhile(coro, None))
  