nos_facts module and tests (#44094)

test/units/modules/network/nos/fixtures/nos_facts_show_inventory_chassis

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+NAME: Chassis  		DESCR:System Chassis
+SID:BR-VDX6740     	SwitchType:131
+PN:40-1000927-06  	SN:CPL2541K01E

test/units/modules/network/nos/fixtures/nos_facts_show_running-config

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+ switch-attributes host-name LEAF4

test/units/modules/network/nos/fixtures/nos_facts_show_version

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+Network Operating System Software
+Network Operating System Version: 7.2.0
+Copyright (c) 1995-2017 Brocade Communications Systems, Inc.
+Firmware name:      7.2.0
+Build Time:         10:52:47 Jul 10, 2017
+Install Time:       01:32:03 Jan  5, 2018
+Kernel:             2.6.34.6
+
+BootProm:           1.0.1
+Control Processor:  e500mc with 4096 MB of memory
+
+Slot    Name    Primary/Secondary Versions                         Status
+---------------------------------------------------------------------------
+SW/0    NOS     7.2.0                                              ACTIVE*
+                7.2.0
+SW/1    NOS     7.2.0                                              STANDBY
+                7.2.0

test/units/modules/network/nos/test_nos_facts.py

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+#
+# (c) 2018 Extreme Networks Inc.
+#
+# 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/>.
+#
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+from ansible.compat.tests.mock import patch
+from ansible.modules.network.nos import nos_facts
+from units.modules.utils import set_module_args
+from .nos_module import TestNosModule, load_fixture
+
+
+class TestNosFactsModule(TestNosModule):
+
+    module = nos_facts
+
+    def setUp(self):
+        super(TestNosFactsModule, self).setUp()
+        self.mock_run_commands = patch('ansible.modules.network.nos.nos_facts.run_commands')
+        self.run_commands = self.mock_run_commands.start()
+
+    def tearDown(self):
+        super(TestNosFactsModule, self).tearDown()
+        self.mock_run_commands.stop()
+
+    def load_fixtures(self, commands=None):
+        def load_from_file(*args, **kwargs):
+            commands = args[1]
+            output = list()
+
+            for command in commands:
+                filename = str(command).split(' | ')[0].replace(' ', '_')
+                output.append(load_fixture('nos_facts_%s' % filename))
+            return output
+
+        self.run_commands.side_effect = load_from_file
+
+    def test_nos_facts(self):
+        set_module_args(dict(gather_subset='default'))
+        result = self.execute_module()
+        self.assertEqual(
+            result['ansible_facts']['ansible_net_model'], 'BR-VDX6740'
+        )
+        self.assertEqual(
+            result['ansible_facts']['ansible_net_serialnum'], 'CPL2541K01E'
+        )