Lenovo cnos banner new module (#50145)

* Adding cnos_banner module to the list.

test/units/modules/network/cnos/fixtures/cnos_banner_show_banner.txt

@@ -0,0 +1,3 @@
+this is a sample
+mulitline banner
+used for testing

test/units/modules/network/cnos/test_cnos_banner.py

@@ -0,0 +1,62 @@
+# 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 units.compat.mock import patch
+from ansible.modules.network.cnos import cnos_banner
+from units.modules.utils import set_module_args
+from .cnos_module import TestCnosModule, load_fixture
+
+
+class TestCnosBannerModule(TestCnosModule):
+
+    module = cnos_banner
+
+    def setUp(self):
+        super(TestCnosBannerModule, self).setUp()
+
+        self.mock_exec_command = patch('ansible.modules.network.cnos.cnos_banner.exec_command')
+        self.exec_command = self.mock_exec_command.start()
+
+        self.mock_load_config = patch('ansible.modules.network.cnos.cnos_banner.load_config')
+        self.load_config = self.mock_load_config.start()
+
+    def tearDown(self):
+        super(TestCnosBannerModule, self).tearDown()
+        self.mock_exec_command.stop()
+        self.mock_load_config.stop()
+
+    def load_fixtures(self, commands=None):
+        self.exec_command.return_value = (0, load_fixture('cnos_banner_show_banner.txt').strip(), None)
+        self.load_config.return_value = dict(diff=None, session='session')
+
+    def test_cnos_banner_create(self):
+        for banner_type in ('login', 'motd'):
+            set_module_args(dict(banner=banner_type, text='test\nbanner\nstring'))
+            commands = ['banner {0} test'.format(banner_type), 'banner {0} banner'.format(banner_type), 'banner {0} string'.format(banner_type)]
+            self.execute_module(changed=True, commands=commands)
+
+    def test_cnos_banner_remove(self):
+        set_module_args(dict(banner='login', state='absent'))
+        commands = ['no banner login']
+        self.execute_module(changed=True, commands=commands)
+
+    def test_cnos_banner_nochange(self):
+        banner_text = load_fixture('cnos_banner_show_banner.txt').strip()
+        set_module_args(dict(banner='login', text=banner_text))
+        self.execute_module()