text: 
  from geventhttpclient.client import Header
  
  def test_header_dict_str():
      d = {}
      d[Header("Host")] = "gwikzone.org"
  
      assert Header('HOST') in d
      assert d[Header('HosT')] == "gwikzone.org"
  
      assert d['host'] == "gwikzone.org"
      assert 'host' in d 
  
  def test_header_replace():
      d = {}
      d[Header('Content-Type')] = "text/plain"
      d[Header('content-type')] = "text/html"
      assert d['content-type'] == "text/html"
  