Fix ios_facts return values (#35239)

* Revert model and serialnum to older version

* Add stacked versions of model and serialnum as separate facts

* Add unit test to check stacked output

* Alter model regex to address #34768

test/units/modules/network/ios/test_ios_facts.py

@@ -0,0 +1,66 @@
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+# Make coding more python3-ish
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+from ansible.compat.tests.mock import patch
+from ansible.modules.network.ios import ios_facts
+from units.modules.utils import set_module_args
+from .ios_module import TestIosModule, load_fixture
+
+
+class TestIosFactsModule(TestIosModule):
+
+    module = ios_facts
+
+    def setUp(self):
+        super(TestIosFactsModule, self).setUp()
+        self.mock_run_commands = patch('ansible.modules.network.ios.ios_facts.run_commands')
+        self.run_commands = self.mock_run_commands.start()
+
+    def tearDown(self):
+        super(TestIosFactsModule, self).tearDown()
+        self.mock_run_commands.stop()
+
+    def load_fixtures(self, commands=None):
+        def load_from_file(*args, **kwargs):
+            module = args
+            commands = kwargs['commands']
+            output = list()
+
+            for command in commands:
+                filename = str(command).split(' | ')[0].replace(' ', '_')
+                output.append(load_fixture('ios_facts_%s' % filename))
+            return output
+
+        self.run_commands.side_effect = load_from_file
+
+    def test_ios_facts_stacked(self):
+        set_module_args(dict(gather_subset='default'))
+        result = self.execute_module()
+        self.assertEqual(
+            result['ansible_facts']['ansible_net_model'], 'WS-C3750-24TS'
+        )
+        self.assertEqual(
+            result['ansible_facts']['ansible_net_serialnum'], 'CAT0726R0ZU'
+        )
+        self.assertEqual(
+            result['ansible_facts']['ansible_net_stacked_models'], ['WS-C3750-24TS-E', 'WS-C3750-24TS-E', 'WS-C3750G-12S-E']
+        )
+        self.assertEqual(
+            result['ansible_facts']['ansible_net_stacked_serialnums'], ['CAT0726R0ZU', 'CAT0726R10A', 'CAT0732R0M4']
+        )