Test for UpdateDocsTask.run_setup

At this point the test is passing, but it's not running the section of
code that I want it to run :(

readthedocs/rtd_tests/tests/test_build_notifications.py

@@ -11,7 +11,7 @@
 
 from readthedocs.builds.models import Build, Version
 from readthedocs.projects.models import Project, EmailHook, WebHook
-from readthedocs.projects.tasks import send_notifications
+from readthedocs.projects.tasks import send_notifications, UpdateDocsTask
 
 
 class BuildNotificationsTests(TestCase):
@@ -46,3 +46,37 @@ def test_send_email_and_webhook__notification(self):
             send_notifications(self.version.pk, self.build.pk)
             mock.assert_called_once()
         self.assertEqual(len(mail.outbox), 1)
+
+    @patch('readthedocs.projects.tasks.UpdateDocsTask.get_project')
+    @patch('readthedocs.projects.tasks.UpdateDocsTask.get_version')
+    @patch('readthedocs.projects.tasks.UpdateDocsTask.get_build')
+    @patch('readthedocs.projects.tasks.UpdateDocsTask.setup_vcs')
+    def test_send_email_on_generic_failure_at_setup_vcs(
+            self, setup_vcs, get_build, get_version, get_project):
+        # TODO: this should be ``_at_run_setup`` but since we depend on
+        # ``self.setup_env`` when an exception is raised, we need to raise the
+        # exception after this variable is instantiated
+        fixture.get(EmailHook, project=self.project)
+        build = fixture.get(
+            Build,
+            project=self.project,
+            version=self.project.versions.first(),
+        )
+        # We force an unhandled raised at ``setup_vcs``
+        setup_vcs.side_effect = Exception('Generic exception raised at setup')
+
+        # These mocks are needed at the beginning of the ``.run()`` method
+        get_build.return_value = {'id': build.pk}
+        get_version.return_value = self.version
+        get_project.return_value = self.project
+
+        update_docs = UpdateDocsTask()
+        result = update_docs.delay(
+            self.project.pk,
+            build_pk=build.pk,
+            record=False,
+            intersphinx=False,
+        )
+        self.assertTrue(result.successful())
+        self.assertFalse(result.result)
+        self.assertEqual(len(mail.outbox), 1)