Bug #685: Add failing unit test

The simplest way to reproduce Bug #685 is to ask for a non
existent page. This should return a proper 404. It
currently doesn't.
So add a unit test exactly for this.

This unit test fails currently! It will fail until the bug
gets fixed.

mediagoblin/tests/test_misc.py

@@ -0,0 +1,26 @@
+# GNU MediaGoblin -- federated, autonomous media hosting
+# Copyright (C) 2011 MediaGoblin contributors.  See AUTHORS.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from nose.tools import assert_equal
+
+from mediagoblin.tests.tools import setup_fresh_app
+
+
+@setup_fresh_app
+def test_404_for_non_existent(test_app):
+    assert_equal(test_app.get('/does-not-exist/',
+                              expect_errors=True).status_int,
+                 404)