tests(scheduler): confirm "network unreachable" raises KubeHTTPException (#1142)

This error occurs when the registry hosting the image being pulled by `deis pull` (or, in the case
of `git push deis master`, quay.io/deis/slugrunner) becomes unreachable. This test confirms that
master has fixed the original error, which is that a KubeException used to be raised, being
uncaught in older releases of Workflow. This has since been fixed in master.

Author: Matthew Fisher

rootfs/scheduler/mock.py

@@ -735,6 +735,11 @@ def put(request, context):
         context.status_code = 404
         context.reason = 'Not Found'
         return {}
+    # raise a 503 when we want to intentionally test for it
+    elif item['metadata']['name'] == 'image-pull-failed-test':
+        context.status_code = 503
+        context.reason = 'Network Unreachable'
+        return {}
 
     data = request.json()
 

rootfs/scheduler/tests/test_deployments.py

@@ -88,6 +88,13 @@ def test_update_deployment_failure(self):
             msg='failed to update Deployment foo in Namespace {}: 404 Not Found'.format(self.namespace)  # noqa
         ):
             self.update(self.namespace, 'foo')
+        name = 'image-pull-failed-test'
+        self.create(name=name)
+        with self.assertRaises(
+            KubeHTTPException,
+            msg='failed to update Deployment "{}": 503 Network Unreachable'.format(name)
+        ):
+            self.update(self.namespace, name)
 
     def test_update(self):
         # test success