Add test for ResourceDefinition equality

ResourceDefinition objects compare equal if they are generated from
equivalent templates. Only the MRO stands between us and disaster (since
both superclasses - ResourceDefinitionCore and collections.Mapping - define
__eq__ methods), so add a test to confirm that we are getting the correct
one.

Change-Id: I8181f91f08fd81104fe493539511d6fd129522c8

heat/tests/test_rsrc_defn.py

@@ -15,6 +15,7 @@ from heat.tests.common import HeatTestCase
 
 from heat.common import exception
 from heat.engine.cfn import functions as cfn_funcs
+from heat.engine.hot import functions as hot_funcs
 from heat.engine import properties
 from heat.engine import rsrc_defn
 
@@ -141,6 +142,20 @@ class ResourceDefinitionTest(HeatTestCase):
 
         self.assertEqual(expected_hot, rd.render_hot())
 
+    def test_template_equality(self):
+        class FakeStack(object):
+            def __init__(self, params):
+                self.parameters = params
+
+        def get_param_defn(value):
+            stack = FakeStack({'Foo': value})
+            param_func = hot_funcs.GetParam(stack, 'get_param', 'Foo')
+
+            return rsrc_defn.ResourceDefinition('rsrc', 'SomeType',
+                                                {'Foo': param_func})
+
+        self.assertEqual(get_param_defn('bar'), get_param_defn('baz'))
+
     def test_hash_equal(self):
         rd1 = self.make_me_one_with_everything()
         rd2 = self.make_me_one_with_everything()