1 files changed, 49 insertions, 0 deletions
diff --git a/nova/tests/unit/cast_as_call.py b/nova/tests/unit/cast_as_call.py
new file mode 100644
index 0000000000..f75600a3b5
--- /dev/null
+++ b/nova/tests/unit/cast_as_call.py
@@ -0,0 +1,49 @@
+# Copyright 2013 Red Hat, Inc.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import fixtures
+from oslo import messaging
+
+
+class CastAsCall(fixtures.Fixture):
+
+    """Make RPC 'cast' behave like a 'call'.
+
+    This is a little hack for tests that need to know when a cast
+    operation has completed. The idea is that we wait for the RPC
+    endpoint method to complete and return before continuing on the
+    caller.
+
+    See Ia7f40718533e450f00cd3e7d753ac65755c70588 for more background.
+    """
+
+    def __init__(self, stubs):
+        super(CastAsCall, self).__init__()
+        self.stubs = stubs
+
+    @staticmethod
+    def _stub_out(stubs, obj):
+        orig_prepare = obj.prepare
+
+        def prepare(self, *args, **kwargs):
+            cctxt = orig_prepare(self, *args, **kwargs)
+            CastAsCall._stub_out(stubs, cctxt)  # woo, recurse!
+            return cctxt
+
+        stubs.Set(obj, 'prepare', prepare)
+        stubs.Set(obj, 'cast', obj.call)
+
+    def setUp(self):
+        super(CastAsCall, self).setUp()
+        self._stub_out(self.stubs, messaging.RPCClient)