Add decorator to skip tests for a required resource type

Skip tests if a resource type is unavailable. This would
help us add tests for new resource plugins that would be
skipped for earlier releases.

Change-Id: Ia9f08f9148934e80af6ba827e71e110a89a89859

heat_tempest_plugin/common/test.py

@@ -34,6 +34,7 @@ from tempest import config
 
 LOG = logging.getLogger(__name__)
 _LOG_FORMAT = "%(levelname)8s [%(name)s] %(message)s"
+_resource_types = None
 
 
 def call_until_true(duration, sleep_for, func, *args, **kwargs):
@@ -86,6 +87,29 @@ def requires_convergence(test_method):
     return skipper(test_method)
 
 
+def requires_resource_type(resource_type):
+    '''Decorator for tests requiring a resource type.
+
+    The decorated test will be skipped when the resource type is not available.
+    '''
+    def decorator(test_method):
+        conf = getattr(config.CONF, 'heat_plugin', None)
+        if not conf or conf.auth_url is None:
+            return test_method
+
+        global _resource_types
+        if not _resource_types:
+            manager = clients.ClientManager(conf)
+            obj_rtypes = manager.orchestration_client.resource_types.list()
+            _resource_types = list(t.resource_type for t in obj_rtypes)
+        rtype_available = resource_type and resource_type in _resource_types
+        skipper = testtools.skipUnless(
+            rtype_available,
+            "%s resource type not available, skipping test." % resource_type)
+        return skipper(test_method)
+    return decorator
+
+
 class HeatIntegrationTest(testtools.testcase.WithAttributes,
                           testscenarios.WithScenarios,
                           testtools.TestCase):

heat_tempest_plugin/tests/functional/test_create_update_neutron_trunk.py

@@ -17,6 +17,7 @@ import yaml
 
 from tempest.lib import decorators
 
+from heat_tempest_plugin.common import test
 from heat_tempest_plugin.tests.functional import functional_base
 
 
@@ -72,6 +73,7 @@ outputs:
 '''
 
 
+@test.requires_resource_type('OS::Neutron::Trunk')
 class UpdateTrunkTest(functional_base.FunctionalTestsBase):
 
     @staticmethod