Update Python versions in tests (#540)

* Update tests to remove Python 3.7 and add 3.11-3.12

* Remove python 3.12 tests because `setuptools` was removed from stdlib

* Update tests to account for actual behavior (expired tokens are quietly refreshed)
#538 added these tests and NeonGeckoCom/neon-hana#35 resolved the reason this test previously raised an exception

.github/workflows/unit_tests.yml

@@ -11,7 +11,7 @@ jobs:
   skill_object_tests:
     strategy:
       matrix:
-        python-version: [ 3.7, 3.8, 3.9, '3.10' ]
+        python-version: [ 3.8, 3.9, '3.10', '3.11' ]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
@@ -39,7 +39,7 @@ jobs:
   unit_tests:
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, '3.10']
+        python-version: [ 3.8, 3.9, '3.10', '3.11' ]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2

tests/hana_util_tests.py

@@ -35,13 +35,12 @@
 from time import time, sleep
 from unittest.mock import patch
 
-
 valid_config = {}
 valid_headers = {}
 
 
 class HanaUtilTests(unittest.TestCase):
-    test_server = "https://hana.neonaialpha.com"
+    test_server = "https://hana.neonaibeta.com"
     test_path = join(dirname(__file__), "hana_test.json")
 
     def tearDown(self) -> None:
@@ -76,18 +75,26 @@ def test_request_backend(self, config_path):
         # Test expired/invalid token
         old_token_path = join(dirname(__file__), "outdated_hana_token.json")
         copy(old_token_path, self.test_path)
+        with open(self.test_path, 'r') as f:
+            old_contents = f.read()
         neon_utils.hana_utils._client_config = {}
         neon_utils.hana_utils._headers = {}
-        from neon_utils.hana_utils import ServerException
-        with self.assertRaises(ServerException):
-            # Request fails due to invalid token
-            request_backend("/neon/get_response",
-                            {"lang_code": "en-us",
-                             "utterance": "who are you",
-                             "user_profile": {}}, self.test_server)
-        # Invalid cached token is removed
-        self.assertFalse(isfile(self.test_path))
 
+        # Request generates an updated token
+        resp = request_backend("/neon/get_response",
+                               {"lang_code": "en-us",
+                                "utterance": "who are you",
+                                "user_profile": {}}, self.test_server)
+        self.assertEqual(resp['lang_code'], "en-us")
+        self.assertIsInstance(resp['answer'], str)
+
+        # New token is created at expected path
+        self.assertTrue(isfile(self.test_path))
+        with open(self.test_path, 'r') as f:
+            new_contents = f.read()
+        self.assertNotEqual(new_contents, old_contents)
+
+        # TODO: Test token refresh fails, old token is removed
         # TODO: Test invalid route, invalid request data
 
     @patch("neon_utils.hana_utils._get_client_config_path")