tests: update default runtime used for tests

.github/workflows/lint.yml

@@ -12,7 +12,7 @@ jobs:
     - name: Setup Python
       uses: actions/setup-python@v5
       with:
-        python-version: "3.8"
+        python-version: "3.10"
     - name: Install nox
       run: |
         python -m pip install --upgrade setuptools pip wheel

.github/workflows/unittest.yml

@@ -45,7 +45,7 @@ jobs:
     - name: Setup Python
       uses: actions/setup-python@v5
       with:
-        python-version: "3.8"
+        python-version: "3.10"
     - name: Install coverage
       run: |
         python -m pip install --upgrade setuptools pip wheel

noxfile.py

@@ -32,8 +32,11 @@
 ISORT_VERSION = "isort==5.11.0"
 LINT_PATHS = ["docs", "google_auth_oauthlib", "tests", "noxfile.py", "setup.py"]
 
-DEFAULT_PYTHON_VERSION = "3.8"
+DEFAULT_PYTHON_VERSION = "3.10"
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.10"]
 
+# TODO(https://github.com/googleapis/google-auth-library-python-oauthlib/issues/410):
+# Remove or restore testing for Python 3.7/3.8
 UNIT_TEST_PYTHON_VERSIONS: List[str] = [
     "3.7",
     "3.8",
@@ -58,7 +61,6 @@
 UNIT_TEST_EXTRAS: List[str] = []
 UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.8"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES: List[str] = [
     "mock",
     "pytest",

owlbot.py

@@ -11,10 +11,12 @@
     cov_level=99,
     unit_test_external_dependencies=["click"],
     unit_test_python_versions=["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13"],
+    default_python_version="3.10",
 )
 s.move(templated_files, excludes=[
     "docs/multiprocessing.rst",
     "README.rst",
+    "noxfile.py",
     ".kokoro/samples/**", # this repository has no samples
 ])
 

testing/constraints-3.9.txt

@@ -0,0 +1,10 @@
+# This constraints file is used to check that lower bounds
+# are correct in setup.py
+# List *all* library dependencies and extras in this file.
+# Pin the version to the lower bound.
+#
+# e.g., if setup.py has "foo >= 1.14.0, < 2.0.0dev",
+# Then this file should have foo==1.14.0
+google-auth==2.15.0
+requests-oauthlib==0.7.0
+click==6.0.0