def test_object_add_header(self):
     request = EscherRequest({
         'method': 'POST',
         'host': 'host.foo.com',
         'uri': '/example/path/?foo=bar&abc=cba',
         'headers': [],
         'body': 'HELLO WORLD!',
     })
     request.add_header('Foo', 'Bar')
     self.assertListEqual(request.headers(), [('Foo', 'Bar')])