When you want to change the HTTP headers of Flask's test client

# -*- coding: utf-8 -*-
from nose.tools import ok_, eq_
import flask

class ClientProxy(object):
    def __init__(self, app):
        self.app = app

    def __call__(self, environ, start_response):
        environ['HTTP_USER_AGENT'] = environ.get('HTTP_USER_AGENT', 'hogehoge')
        return self.app(environ, start_response)


def sample_test():
    app = flask.Flask(__name__)
    app.wsgi_app = ClientProxy(app.wsgi_app)
    with app.test_client() as c:
        c.get('/')
        eq_(flask.request.user_agent.string, 'hogehoge')

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