implement get_sla method

for getting a specific SLA

hypernode_api_python/client.py

@@ -2,6 +2,7 @@
 
 DEFAULT_USER_AGENT = "hypernode-api-python"
 HYPERNODE_API_URL = "https://api.hypernode.com"
+HYPERNODE_API_ADDON_LIST_ENDPOINT = "/v2/addon/"
 HYPERNODE_API_ADDON_SLA_LIST_ENDPOINT = "/v2/addon/slas/"
 HYPERNODE_API_APP_CHECK_PAYMENT_INFORMATION = "/v2/app/{}/check-payment-information/"
 HYPERNODE_API_APP_CONFIGURATION_ENDPOINT = "/v2/configuration/"
@@ -272,6 +273,22 @@ def get_slas(self):
         """
         return self.requests("GET", HYPERNODE_API_ADDON_SLA_LIST_ENDPOINT)
 
+    def get_sla(self, sla_code):
+        """
+        List a specific SLA
+        Example:
+        >    client.get_sla("sla-standard").json()
+        >    {'billing_period': 1,
+        >     'billing_period_unit': 'month',
+        >     'code': 'sla-standard',
+        >     'id': 123,
+        >     'name': 'SLA Standard',
+        >     'price': 1234}
+
+        :return obj response: The request response object
+        """
+        return self.requests("GET", HYPERNODE_API_ADDON_LIST_ENDPOINT + sla_code + "/")
+
     def get_available_backups_for_app(self, app_name):
         """
         Lists the available backups for the specified app

tests/client/test_get_sla.py

@@ -0,0 +1,26 @@
+from unittest.mock import Mock
+
+from tests.testcase import TestCase
+from hypernode_api_python.client import (
+    HypernodeAPIPython,
+    HYPERNODE_API_ADDON_LIST_ENDPOINT,
+)
+
+
+class TestGetSla(TestCase):
+    def setUp(self):
+        self.mock_request = Mock()
+        self.client = HypernodeAPIPython(token="mytoken")
+        self.client.requests = self.mock_request
+
+    def test_calls_hypernode_api_endpoint_with_correct_parameters(self):
+        self.client.get_sla("sla-standard")
+
+        self.mock_request.assert_called_once_with(
+            "GET", HYPERNODE_API_ADDON_LIST_ENDPOINT + "sla-standard/"
+        )
+
+    def test_returns_json_result(self):
+        ret = self.client.get_sla("sla-standard")
+
+        self.assertEqual(ret, self.mock_request.return_value)