Add support for Python 3.9 (#146)

.github/workflows/runtests.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ '3.6', '3.7', '3.8' ]  # Make sure this matches the supported versions in setup.py
+        python-version: [ '3.6', '3.7', '3.8', '3.9' ]  # Make sure this matches the supported versions in setup.py
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}

setup.py

@@ -56,5 +56,7 @@ setup(
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
+        "License :: OSI Approved :: MIT License",
     ],
 )

test/test_base.py

@@ -5,8 +5,12 @@ from concurrent.futures import Future
 from threading import Event
 from typing import Callable, Tuple, Any, List, Optional, Union
 from unittest import TestCase
-# noinspection PyProtectedMember
-from unittest.case import _AssertLogsContext
+if sys.version_info[1] < 9:
+    # noinspection PyProtectedMember
+    from unittest.case import _AssertLogsContext
+else:
+    # noinspection PyUnresolvedReferences,PyProtectedMember,PyCompatibility
+    from unittest._log import _AssertLogsContext
 from urllib.parse import urljoin
 
 from azure.kusto.data import KustoClient, ClientRequestProperties
@@ -66,7 +70,7 @@ class TestBase(TestCase):
         """
         This method overrides the one in `unittest.case.TestCase`, and has the same behavior, except for not causing a failure when there are no log messages.
         The point is to allow asserting there are no logs.
-        Get rid of this once this is resolved: https://github.com/python/cpython/pull/18067
+        Get rid of this in Python 3.10, as this was resolved: https://bugs.python.org/issue39385
         """
         # noinspection PyArgumentList
         return CustomAssertLogsContext(self, logger_to_watch, level)
@@ -76,6 +80,7 @@ class TestBase(TestCase):
         raise Exception("Mock exception")
 
 
+# Get rid of this in Python 3.10, as this was resolved: https://bugs.python.org/issue39385
 class CustomAssertLogsContext(_AssertLogsContext):
     # noinspection PyUnresolvedReferences
     def __exit__(self, exc_type, exc_val, exc_tb) -> Optional[bool]: