adds module eos_banner (#20796)

* new module allows for configuration of eos multiline banners
* adds unit test cases for module

test/units/modules/network/eos/fixtures/eos_banner_show_banner.txt

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

test/units/modules/network/eos/test_eos_banner.py

@@ -0,0 +1,106 @@
+# 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
+
+import os
+import json
+
+from ansible.compat.tests import unittest
+from ansible.compat.tests.mock import patch, MagicMock
+from ansible.errors import AnsibleModuleExit
+from ansible.modules.network.eos import eos_banner
+from ansible.module_utils import basic
+from ansible.module_utils._text import to_bytes
+
+
+def set_module_args(args):
+    args = json.dumps({'ANSIBLE_MODULE_ARGS': args})
+    basic._ANSIBLE_ARGS = to_bytes(args)
+
+fixture_path = os.path.join(os.path.dirname(__file__), 'fixtures')
+fixture_data = {}
+
+def load_fixture(name):
+    path = os.path.join(fixture_path, name)
+
+    if path in fixture_data:
+        return fixture_data[path]
+
+    with open(path) as f:
+        data = f.read()
+
+    try:
+        data = json.loads(data)
+    except:
+        pass
+
+    fixture_data[path] = data
+    return data
+
+
+class TestEosBannerModule(unittest.TestCase):
+
+    def setUp(self):
+        self.mock_run_commands = patch('ansible.modules.network.eos.eos_banner.run_commands')
+        self.run_commands = self.mock_run_commands.start()
+
+        self.mock_load_config = patch('ansible.modules.network.eos.eos_banner.load_config')
+        self.load_config = self.mock_load_config.start()
+
+    def tearDown(self):
+        self.mock_run_commands.stop()
+        self.mock_load_config.stop()
+
+    def execute_module(self, failed=False, changed=False, commands=None, sort=True):
+
+        self.run_commands.return_value = load_fixture('eos_banner_show_banner.txt').strip()
+        self.load_config.return_value = dict(diff=None, session='session')
+
+        with self.assertRaises(AnsibleModuleExit) as exc:
+            eos_banner.main()
+
+        result = exc.exception.result
+
+        if failed:
+            self.assertTrue(result['failed'], result)
+        else:
+            self.assertEqual(result['changed'], changed, result)
+
+        if commands:
+            if sort:
+                self.assertEqual(sorted(commands), sorted(result['commands']), result['commands'])
+            else:
+                self.assertEqual(commands, result['commands'])
+
+        return result
+
+    def test_eos_banner_create(self):
+        set_module_args(dict(banner='login', text='test\nbanner\nstring'))
+        commands = ['banner login', 'test', 'banner', 'string', 'EOF']
+        self.execute_module(changed=True, commands=commands)
+
+    def test_eos_banner_remove(self):
+        set_module_args(dict(banner='login', state='absent'))
+        commands = ['no banner login']
+        self.execute_module(changed=True, commands=commands)
+
+    def test_eos_banner_nochange(self):
+        banner_text = load_fixture('eos_banner_show_banner.txt').strip()
+        set_module_args(dict(banner='login', text=banner_text))
+        self.execute_module()
+