Flask session/cookie disappearance after redirect issue - werkzeug testcase

werkzeug.patch

diff --git a/werkzeug/testsuite/test.py b/werkzeug/testsuite/test.py
index 795de90..5ee8864 100644
--- a/werkzeug/testsuite/test.py
+++ b/werkzeug/testsuite/test.py
@@ -26,7 +26,7 @@ from werkzeug.datastructures import MultiDict
 
 
 def cookie_app(environ, start_response):
-    """A WSGI application which sets a cookie, and returns as a ersponse any
+    """A WSGI application which sets a cookie, and returns as a response any
     cookie which exists.
     """
     response = Response(environ.get('HTTP_COOKIE', 'No Cookie'),
@@ -34,6 +34,18 @@ def cookie_app(environ, start_response):
     response.set_cookie('test', 'test')
     return response(environ, start_response)
 
+def cookie_redirect_app(environ, start_response):
+    """A WSGI application which issues redirect on POST requests and prints
+    out cookie information with GET requests.
+    """
+    req = Request(environ)
+    if req.method == 'POST':
+        resp = redirect('http://localhost/')
+        return resp(environ, start_response)
+    response = Response(environ.get('HTTP_COOKIE', 'No Cookie!'),
+                        mimetype='text/plain')
+    return response(environ, start_response)
+
 
 def redirect_loop_app(environ, start_response):
     response = redirect('http://localhost/some/redirect/')
@@ -126,6 +138,23 @@ class TestTestCase(WerkzeugTestCase):
         appiter, code, headers = c.open('/path2')
         assert ''.join(appiter) == 'test=test'
 
+    def test_cookie_redirect(self):
+        c = Client(cookie_redirect_app)
+        # Initially check that no cookie is set
+        appiter, code, headers = c.open('/')
+        assert ''.join(appiter) == 'No Cookie!'
+        # Set the cookie and do the GET request
+        c.set_cookie('localhost', 'foo', 'bar')
+        appiter, code, headers = c.open('/')
+        assert list(appiter) == ['foo=bar']
+        # Now do the redirect and check whether cookie still exists
+        appiter, code, headers = c.post('/', follow_redirects=True, data='')
+        assert list(appiter) == ['foo=bar']
+        # One more time, just to be sure :S
+        c.set_cookie('localhost', 'foo', 'nobar')
+        appiter, code, headers = c.post('/', follow_redirects=True, data='')
+        assert list(appiter) == ['foo=nobar']
+
     def test_environ_builder_basics(self):
         b = EnvironBuilder()
         assert b.content_type is None