Validate PR for flask-restful

test.py

import sys
sys.path.append('./flask-restful')
from flask import Flask
from flask_restful import Api,Resource, reqparse

app = Flask(__name__)
api = Api(app)

class Foo(Resource):
    def post(self):
        parser = reqparse.RequestParser()
        parser.add_argument('foo')
        parser.add_argument('bar', location='file')
        args = parser.parse_args()
        return {'foo': 'bar'}


api.add_resource(Foo, '/')

if __name__ == '__main__':
    import unittest

    class FooTest(unittest.TestCase):
        def setUp(self):
            self.app = app.test_client()

        def test_foo(self):
            self.app.post('/', data={'foo': 123})

    unittest.main(verbosity=2)