Documented changes on the g object some more

docs/api.rst

@@ -272,7 +272,16 @@ thing, like it does for :class:`request` and :class:`session`.
 
    Starting with Flask 0.10 this is stored on the application context and
    no longer on the request context which means it becomes available if
-   only the application context is bound and not yet a request.
+   only the application context is bound and not yet a request.  This
+   is especially useful when combined with the :ref:`faking-resources`
+   pattern for testing.
+
+   Additionally as of 0.10 you can use the subscription operator syntax to
+   get an attribute or `None` if it's not set.  These two usages are now
+   equivalent::
+
+        user = getattr(flask.g, 'user', None)
+        user = flask.g['user']
 
    This is a proxy.  See :ref:`notes-on-proxies` for more information.
 

docs/testing.rst

@@ -250,6 +250,7 @@ requires that you pass it a response object::
 This in general is less useful because at that point you can directly
 start using the test client.
 
+.. _faking-resources:
 
 Faking Resources and Context
 ----------------------------

flask/testsuite/basic.py

@@ -1116,6 +1116,19 @@ class BasicFunctionalityTestCase(FlaskTestCase):
         self.assert_equal(len(errors), 3)
         self.assert_equal(errors[1], None)
 
+    def test_subscript_syntax_on_g(self):
+        app = flask.Flask(__name__)
+        app.testing = True
+
+        with app.app_context():
+            self.assert_equal(flask.g['x'], None)
+            flask.g.x = 42
+            self.assert_equal(flask.g['x'], 42)
+            self.assert_equal(flask.g.x, 42)
+            flask.g['x'] = 23
+            self.assert_equal(flask.g['x'], 23)
+            self.assert_equal(flask.g.x, 23)
+
 
 class SubdomainTestCase(FlaskTestCase):