Add a test that checks links on APIs linked from root

This test clicks on each link on API root and checks that rendering the
documentation there does not log any errors. This is not perfect in that
views not listed on API root will not be tested.

pdc/apps/common/tests.py

@@ -420,3 +420,12 @@ def test_filter_set_has_details(self):
             ' * `key_id` (string)\n'
             ' * `name` (string)'
         )
+
+
+class AutoUrlsTestCase(APITestCase):
+    def test_no_autolink_logs_error(self):
+        root = self.client.get(reverse('api-root'))
+        for _, url in root.data.iteritems():
+            with mock.patch('logging.getLogger') as getLogger:
+                self.client.get(url, HTTP_ACCEPT='text/html')
+                self.assertFalse(getLogger.return_value.error.called, "%s has bad link" % url)