new_contents: import string
  import requests
  
  from astropy.tests.helper import remote_data
  from .. import query
  
  def test_resume():
      # Test that a resumed query will finish
  
      length = 2048
  
      # 'range' will return abcd...xyz repeating
      target_url = 'http://127.0.0.1:5000/range/{0}'.format(length)
  
      # simple check: make sure the server does what's expected
      assert len(requests.get(target_url).content) == length
  
      qu = query.BaseQuery()
  
      result_1 = qu._request('GET', target_url, save=True)
      # now the full file is written, so we have to delete parts of it
  
      with open(result_1,'rb') as fh:
          data = fh.read()
      with open(result_1,'wb') as fh:
          # overwrite with a partial file
          fh.write(data[:1024])
      with open(result_1,'rb') as fh:
          data = fh.read()
          assert len(data) == 1024
  
      result_2 = qu._request('GET', target_url, save=True, continuation=True)
  
      assert 'range' in qu._session.headers
      assert qu._session.headers['range'] == 'bytes={0}-{1}'.format(1024, length-1)
  
      with open(result_2,'rb') as fh:
          data = fh.read()
      assert len(data) == length
      assert data == (string.ascii_lowercase*80)[:length].encode('ascii')
  
subject: add a test for resuming started queries