Mocked variable for unittest not working in decorated function in flask

Question

I have a decorator that needs a test similar to this:

# code.py
from flask import request, current_app

def some_decorator(f):
  @wraps(f)
  def decorated_function(*args, **kwargs):
    if current_app.config['ENVIRONMENT'] == 'test':
      pass

    if request.method == 'POST':
      pass

    return f(*args, **kwargs)

  return decorated_function

With test:

import mock

@mock.patch('flask.request')
def test_some_decorator(mock_req):
  mock_req.method = 'POST'

  function = lambda x: x
  decorated_function = some_decorator(function)

  function(1)

Now the thing is, the mocked request.method value does not get overridden with 'POST' mocked value but instead ends up with 'GET' which I think is a default one.

Is there something I'm doing wrong?