Prevent url_for from building when app.testing is True/existing.

Closes #23.

.travis.yml

@@ -1,7 +1,11 @@
 language: python
 python:
   - "2.7"
+  - "3.2"
+  - "3.3"
+  - "3.4"
 # command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
-install: pip install -r docs/requirements.txt --use-mirrors
+install: pip install -r requirements.txt --use-mirrors
 # command to run tests, e.g. python setup.py test
 script: nosetests
+sudo: false

docs/requirements.txt

@@ -1,5 +1,3 @@
-Flask==0.9
-Jinja2==2.6
-Werkzeug==0.8.3
-boto3==1.1.1
-wsgiref==0.1.2
+Flask2
+boto3
+

flask_s3.py

@@ -44,6 +44,8 @@ def url_for(endpoint, **values):
     of your templates.
     """
     app = current_app
+    if app.config.get('TESTING', False) and not app.config.get('S3_OVERRIDE_TESTING', True):
+        return flask_url_for(endpoint, **values)
     if 'S3_BUCKET_NAME' not in app.config:
         raise ValueError("S3_BUCKET_NAME not found in app configuration.")
 

requirements.txt

@@ -0,0 +1,3 @@
+Flask
+boto3
+six

test_flask_static.py

@@ -2,6 +2,7 @@ import unittest
 import ntpath
 import tempfile
 import os
+import sys
 
 try:
     from unittest.mock import Mock, patch, call, mock_open
@@ -51,6 +52,7 @@ class UrlTests(unittest.TestCase):
         self.app.config['S3_USE_HTTPS'] = True
         self.app.config['S3_BUCKET_DOMAIN'] = 's3.amazonaws.com'
         self.app.config['S3_CDN_DOMAIN'] = ''
+        self.app.config['S3_OVERRIDE_TESTING'] = True
 
         @self.app.route('/<url_for_string>')
         def a(url_for_string):
@@ -242,8 +244,10 @@ class S3Tests(unittest.TestCase):
             actual = flask_s3._path_to_relative_url(in_)
             self.assertEquals(exp, actual)
 
+    @unittest.skipIf(sys.version_info < (3, 0),
+                     "not supported in this version")
     @patch('flask_s3.boto3')
-    @patch("{}.open".format("builtins" if six.PY3 else "__builtins__"), mock_open(read_data='test'))
+    @patch("{}.open".format("builtins"), mock_open(read_data='test'))
     def test__write_files(self, key_mock):
         """ Tests _write_files """
         static_url_loc = '/foo/static'