add GET organization by id endpoint. Fix tests

Author: lbalmaceda

auth0/v3/management/organizations.py

@@ -60,6 +60,18 @@ def get_organization_by_name(self, name=None):
         params['name'] = name
 
         return self.client.get(self._url(), params=params)
+    
+    def get_organization(self, id):
+        """Retrieves an organization by its ID.
+
+        Args:
+           id (str): Id of organization to retrieve.
+
+        See: https://auth0.com/docs/api/management/v2#!/Clients/get_clients
+        """
+        params = {}
+
+        return self.client.get(self._url(id), params=params)
 
     def create_organization(self, body):
         """Create a new organization.

auth0/v3/test/management/test_auth0.py

@@ -15,6 +15,7 @@
 from ...management.jobs import Jobs
 from ...management.log_streams import LogStreams
 from ...management.logs import Logs
+from ...management.organizations import Organizations
 from ...management.resource_servers import ResourceServers
 from ...management.roles import Roles
 from ...management.rules import Rules

auth0/v3/test/management/test_organizations.py

@@ -48,6 +48,18 @@ def test_get_organization_by_name(self, mock_rc):
         self.assertEqual('https://domain/api/v2/organizations', args[0])
         self.assertEqual(kwargs['params'], {'name': 'test-org'})
 
+    @mock.patch('auth0.v3.management.organizations.RestClient')
+    def test_get_organization(self, mock_rc):
+        mock_instance = mock_rc.return_value
+
+        c = Organizations(domain='domain', token='jwttoken')
+        c.get_organization('org123')
+
+        args, kwargs = mock_instance.get.call_args
+
+        self.assertEqual('https://domain/api/v2/organizations/org123', args[0])
+        self.assertEqual(kwargs['params'], {})
+
     @mock.patch('auth0.v3.management.organizations.RestClient')
     def test_create_organization(self, mock_rc):
         mock_instance = mock_rc.return_value