Add "os subnet show" command using SDK

Implement the openstack client subnet show command using SDK
calls.  This shows the details of a specific subnet.

Co-Authored-By: Terry Howe <terrylhowe@gmail.com>
Partially implements: blueprint neutron-client
Closes-Bug: #1542359

Change-Id: Iaf18b9e44af35ca0cd61033b468e0c60cd3b05d6

2 files changed, 83 insertions, 2 deletions

diff --git a/openstackclient/tests/network/v2/fakes.py b/openstackclient/tests/network/v2/fakes.py
index 680e9cbf..c24410e1 100644
--- a/openstackclient/tests/network/v2/fakes.py
+++ b/openstackclient/tests/network/v2/fakes.py
@@ -550,18 +550,22 @@ class FakeSubnet(object):
             A FakeResource object faking the subnet
         """
         # Set default attributes.
+        project_id = 'project-id-' + uuid.uuid4().hex
         subnet_attrs = {
             'id': 'subnet-id-' + uuid.uuid4().hex,
             'name': 'subnet-name-' + uuid.uuid4().hex,
             'network_id': 'network-id-' + uuid.uuid4().hex,
             'cidr': '10.10.10.0/24',
-            'tenant_id': 'project-id-' + uuid.uuid4().hex,
+            'tenant_id': project_id,
             'enable_dhcp': True,
             'dns_nameservers': [],
             'allocation_pools': [],
             'host_routes': [],
             'ip_version': '4',
             'gateway_ip': '10.10.10.1',
+            'ipv6_address_mode': 'None',
+            'ipv6_ra_mode': 'None',
+            'subnetpool_id': 'None',
         }
 
         # Overwrite default attributes.
@@ -571,7 +575,8 @@ class FakeSubnet(object):
         subnet_methods = {
             'keys': ['id', 'name', 'network_id', 'cidr', 'enable_dhcp',
                      'allocation_pools', 'dns_nameservers', 'gateway_ip',
-                     'host_routes', 'ip_version', 'tenant_id']
+                     'host_routes', 'ip_version', 'tenant_id',
+                     'ipv6_address_mode', 'ipv6_ra_mode', 'subnetpool_id']
         }
 
         # Overwrite default methods.
@@ -580,6 +585,8 @@ class FakeSubnet(object):
         subnet = fakes.FakeResource(info=copy.deepcopy(subnet_attrs),
                                     methods=copy.deepcopy(subnet_methods),
                                     loaded=True)
+        # Set attributes with special mappings in OpenStack SDK.
+        subnet.project_id = subnet_attrs['tenant_id']
 
         return subnet
 
diff --git a/openstackclient/tests/network/v2/test_subnet.py b/openstackclient/tests/network/v2/test_subnet.py
index 5fca5edd..c02dc407 100644
--- a/openstackclient/tests/network/v2/test_subnet.py
+++ b/openstackclient/tests/network/v2/test_subnet.py
@@ -16,6 +16,7 @@ import mock
 from openstackclient.common import utils
 from openstackclient.network.v2 import subnet as subnet_v2
 from openstackclient.tests.network.v2 import fakes as network_fakes
+from openstackclient.tests import utils as tests_utils
 
 
 class TestSubnet(network_fakes.TestNetworkV2):
@@ -106,3 +107,76 @@ class TestListSubnet(TestSubnet):
         self.network.subnets.assert_called_with()
         self.assertEqual(self.columns_long, columns)
         self.assertEqual(self.data_long, list(data))
+
+
+class TestShowSubnet(TestSubnet):
+    # The subnets to be shown
+    _subnet = network_fakes.FakeSubnet.create_one_subnet()
+
+    columns = (
+        'allocation_pools',
+        'cidr',
+        'dns_nameservers',
+        'enable_dhcp',
+        'gateway_ip',
+        'host_routes',
+        'id',
+        'ip_version',
+        'ipv6_address_mode',
+        'ipv6_ra_mode',
+        'name',
+        'network_id',
+        'project_id',
+        'subnetpool_id',
+    )
+
+    data = (
+        subnet_v2._format_allocation_pools(_subnet.allocation_pools),
+        _subnet.cidr,
+        utils.format_list(_subnet.dns_nameservers),
+        _subnet.enable_dhcp,
+        _subnet.gateway_ip,
+        utils.format_list(_subnet.host_routes),
+        _subnet.id,
+        _subnet.ip_version,
+        _subnet.ipv6_address_mode,
+        _subnet.ipv6_ra_mode,
+        _subnet.name,
+        _subnet.network_id,
+        _subnet.tenant_id,
+        _subnet.subnetpool_id,
+    )
+
+    def setUp(self):
+        super(TestShowSubnet, self).setUp()
+
+        # Get the command object to test
+        self.cmd = subnet_v2.ShowSubnet(self.app, self.namespace)
+
+        self.network.find_subnet = mock.Mock(return_value=self._subnet)
+
+    def test_show_no_options(self):
+        arglist = []
+        verifylist = []
+
+        # Testing that a call without the required argument will fail and
+        # throw a "ParserExecption"
+        self.assertRaises(tests_utils.ParserException,
+                          self.check_parser, self.cmd, arglist, verifylist)
+
+    def test_show_all_options(self):
+        arglist = [
+            self._subnet.name,
+        ]
+        verifylist = [
+            ('subnet', self._subnet.name),
+        ]
+
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+        columns, data = self.cmd.take_action(parsed_args)
+
+        self.network.find_subnet.assert_called_with(self._subnet.name,
+                                                    ignore_missing=False)
+
+        self.assertEqual(self.columns, columns)
+        self.assertEqual(list(self.data), list(data))