Add regression tests for conditional outputs in nested stacks

The patch 85eff5fc3d had to be reverted
because it broke nested stacks in TripleO. To ensure that doesn't happen
again, add some functional tests for conditional outputs in a nested
stack.

Change-Id: I0f7a42c6d1754e340fb519bd228feaa625000ffc
Related-Bug: #1805589

heat_integrationtests/functional/test_conditions.py

@@ -619,3 +619,64 @@ class CreateUpdateResConditionTest(functional_base.FunctionalTestsBase):
         self.update_stack(stack_identifier, template=fail_rename_tmpl,
                           expected_status='UPDATE_FAILED')
         self.update_stack(stack_identifier, template=recover_rename_tmpl)
+
+
+root_output_tmpl = '''
+heat_template_version: 2016-10-14
+parameters:
+  env_type:
+    type: string
+    default: test
+conditions:
+  cd1: {equals : [{get_param: env_type}, "prod"]}
+resources:
+  nested:
+    type: nested_output.yaml
+    properties:
+      env_type: {get_param: env_type}
+outputs:
+  standard:
+    value: {get_attr: [nested, standard]}
+  cond:
+    value: {get_attr: [nested, cond]}
+    condition: cd1
+  cond_value:
+    value: {get_attr: [nested, cond_value]}
+'''
+
+nested_output_tmpl = '''
+heat_template_version: 2016-10-14
+parameters:
+  env_type:
+    type: string
+conditions:
+  cd1: {equals : [{get_param: env_type}, "prod"]}
+outputs:
+  standard:
+    value: hello
+  cond:
+    value: world
+    condition: cd1
+  cond_value:
+    value: {if: [cd1, 'prod', 'test']}
+'''
+
+
+class CreateNestedOutputConditionTest(functional_base.FunctionalTestsBase):
+
+    def test_condition_nested_outputs(self):
+        stack_identifier = self.stack_create(template=root_output_tmpl,
+                                             files={'nested_output.yaml':
+                                                    nested_output_tmpl})
+
+        standard = self.client.stacks.output_show(stack_identifier,
+                                                  'standard')['output']
+        self.assertEqual('hello', standard['output_value'])
+
+        cond = self.client.stacks.output_show(stack_identifier,
+                                              'cond')['output']
+        self.assertIsNone(cond['output_value'])
+
+        cond_val = self.client.stacks.output_show(stack_identifier,
+                                                  'cond_value')['output']
+        self.assertEqual('test', cond_val['output_value'])