Add a test for TimeoutInMinutes accepting a str int

The nested stack resource should accept a number as a string
for TimeoutInMinutes.
The actual fix has been fixed by: https://review.openstack.org/#/c/52564/
but this just proves it.

Change-Id: I769a34eb536177b405a585158df383bbd3021cf9
Partial-bug: #1240903

heat/tests/test_nested_stack.py

@@ -14,6 +14,7 @@
 
 
 import copy
+import json
 
 from oslo.config import cfg
 
@@ -109,6 +110,20 @@ def test_nested_stack_create(self):
 
         self.m.VerifyAll()
 
+    def test_nested_stack_create_with_timeout(self):
+        urlfetch.get('https://server.test/the.template').MultipleTimes().\
+            AndReturn(self.nested_template)
+        self.m.ReplayAll()
+
+        timeout_template = template_format.parse(
+            copy.deepcopy(self.test_template))
+        props = timeout_template['Resources']['the_nested']['Properties']
+        props['TimeoutInMinutes'] = '50'
+
+        stack = self.create_stack(json.dumps(timeout_template))
+        self.assertEquals(stack.state, (stack.CREATE, stack.COMPLETE))
+        self.m.VerifyAll()
+
     def test_nested_stack_create_exceeds_resource_limit(self):
         cfg.CONF.set_override('max_resources_per_stack', 1)
         resource._register_class('GenericResource',