feat: add support for Python 3.10 (#469)

CONTRIBUTING.rst

@@ -22,7 +22,7 @@ In order to add a feature:
   documentation.
 
 - The feature must work fully on the following CPython versions:
-  3.6, 3.7, 3.8 and 3.9 on both UNIX and Windows.
+  3.6, 3.7, 3.8, 3.9 and 3.10 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -72,7 +72,7 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To run a single unit test::
 
-    $ nox -s unit-3.9 -- -k <name of test>
+    $ nox -s unit-3.10 -- -k <name of test>
 
 
   .. note::
@@ -235,11 +235,13 @@ We support:
 -  `Python 3.7`_
 -  `Python 3.8`_
 -  `Python 3.9`_
+-  `Python 3.10`_
 
 .. _Python 3.6: https://docs.python.org/3.6/
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
 .. _Python 3.9: https://docs.python.org/3.9/
+.. _Python 3.10: https://docs.python.org/3.10/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.

noxfile.py

@@ -30,7 +30,7 @@
 
 DEFAULT_PYTHON_VERSION = "3.8"
 SYSTEM_TEST_PYTHON_VERSIONS = ["3.7"]
-UNIT_TEST_PYTHON_VERSIONS = ["3.6", "3.7", "3.8", "3.9"]
+UNIT_TEST_PYTHON_VERSIONS = ["3.6", "3.7", "3.8", "3.9", "3.10"]
 
 CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
 

owlbot.py

@@ -133,6 +133,7 @@ def update_fixup_scripts(library):
 templated_files = common.py_library(
     samples=False,  # set to True only if there are samples
     system_test_python_versions=["3.7"],
+    unit_test_python_versions=["3.6", "3.7", "3.8", "3.9", "3.10"],
     unit_test_external_dependencies=["aiounittest"],
     system_test_external_dependencies=["pytest-asyncio"],
     microgenerator=True,

setup.py

@@ -77,6 +77,7 @@
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
         "Operating System :: OS Independent",
         "Topic :: Internet",
         "Topic :: Software Development :: Libraries :: Python Modules",

tests/unit/v1/test_base_batch.py

@@ -18,7 +18,7 @@
 import mock
 
 
-class TestableBaseWriteBatch(BaseWriteBatch):
+class DerivedBaseWriteBatch(BaseWriteBatch):
     def __init__(self, client):
         super().__init__(client=client)
 
@@ -32,7 +32,7 @@ def commit(self):
 class TestBaseWriteBatch(unittest.TestCase):
     @staticmethod
     def _get_target_class():
-        return TestableBaseWriteBatch
+        return DerivedBaseWriteBatch
 
     def _make_one(self, *args, **kwargs):
         klass = self._get_target_class()