def test_url_for(self):
c = Mock()
c.root_folders = Mock(return_value=[])
c.all_symbols = Mock(return_value=[])
c.all_functions = Mock(return_value=[])
c.all_variables = Mock(return_value=[])
c = renderers.HTMLRenderer(c)
actual = c.url_for('/')
self.assertEqual('/', actual)
# preserves query parameters
self.request.args = {'foo': 'bar'}
actual = c.url_for('/')
self.assertEqual('/?foo=bar', actual)
