tests: add Python 3.15 testing

.github/workflows/unittest.yml

@@ -12,13 +12,14 @@ name: unittest
 permissions:
   contents: read
 
+
 jobs:
   unit:
     runs-on: ubuntu-22.04
     strategy:
       fail-fast: true
       matrix:
-        python: ['3.9', '3.10', "3.11", "3.12", "3.13", "3.14"]
+        python: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.15"]
     steps:
     - name: Checkout
       uses: actions/checkout@v6
@@ -31,21 +32,50 @@ jobs:
       uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python }}
+        allow-prereleases: true
+    - name: Setup uv
+      uses: astral-sh/setup-uv@v5
+      with:
+        enable-cache: true
+        cache-dependency-glob: 'packages/**/testing/constraints*.txt'
     - name: Install nox
       run: |
-        python -m pip install --upgrade setuptools pip wheel
-        python -m pip install nox
+        uv pip install --system nox nox-uv
+    # Caches compiled wheels locally to prevent building heavy libraries
+    # such as grpcio, which we build from scratch on every run for Python 3.15+.
+    # Follow https://github.com/grpc/grpc/issues/41010 for updates.
+    - name: Cache Built Python 3.15 Wheels
+      if: matrix.python == '3.15'
+      uses: actions/cache@v4
+      with:
+        path: .uv-wheel-cache
+        key: ${{ runner.os }}-uv-wheels-3.15-${{ hashFiles('packages/**/testing/constraints*.txt') }}
+        restore-keys: |
+          ${{ runner.os }}-uv-wheels-3.15-
     - name: Run unit tests
       env:
         COVERAGE_FILE: ${{ github.workspace }}/.coverage-${{ matrix.python }}
         BUILD_TYPE: presubmit
         TARGET_BRANCH: ${{ github.base_ref || github.event.merge_group.base_ref }}
         TEST_TYPE: unit
         PY_VERSION: ${{ matrix.python }}
+        # Workaround: Allows libcst to compile on Python 3.15+ while PyO3 catches up
+        # Can be removed once libcst releases a version with native Python 3.15 wheels
+        # Follow https://github.com/Instagram/LibCST/issues/1445 for updates.
+        PYO3_USE_ABI3_FORWARD_COMPATIBILITY: "1"
       run: |
+        # Only inject overrides if we are strictly on the 3.15 pre-release
+        # This is needed to speed up builds
+        if [ "${{ matrix.python }}" = "3.15" ]; then
+          # Tell uv it is allowed to use the pre-release 3.15 toolchain
+          export UV_PRERELEASE="allow"
+
+          # Route uv's wheel and environment cache to our persistent workspace directory
+          export UV_CACHE_DIR="${{ github.workspace }}/.uv-wheel-cache"
+        fi
         ci/run_conditional_tests.sh
     - name: Upload coverage results
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v5
       with:
         name: coverage-artifact-${{ matrix.python }}
         path: .coverage-${{ matrix.python }}
@@ -57,14 +87,14 @@ jobs:
         - unit
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       # Use a fetch-depth of 2 to avoid error `fatal: origin/main...HEAD: no merge base`
       # See https://github.com/googleapis/google-cloud-python/issues/12013
       # and https://github.com/actions/checkout#checkout-head.
       with:
         fetch-depth: 2
     - name: Setup Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: "3.10"
     - name: Set number of files changes in packages directory

.librarian/generator-input/client-post-processing/bigtable-integration.yaml

@@ -357,52 +357,6 @@ replacements:
 
       Quick Start
     count: 1
-  - paths: [
-      packages/google-cloud-bigtable/mypy.ini
-    ]
-    before: |
-      \[mypy\]
-      [\s\S]*?incremental = True
-    after: |
-      [mypy]
-      python_version = 3.13
-      namespace_packages = True
-      check_untyped_defs = True
-      warn_unreachable = True
-      disallow_any_generics = True
-      exclude = tests/unit/gapic/
-
-      [mypy-grpc.*]
-      ignore_missing_imports = True
-
-      [mypy-google.auth.*]
-      ignore_missing_imports = True
-
-      [mypy-google.iam.*]
-      ignore_missing_imports = True
-
-      [mypy-google.longrunning.*]
-      ignore_missing_imports = True
-
-      [mypy-google.oauth2.*]
-      ignore_missing_imports = True
-
-      [mypy-google.rpc.*]
-      ignore_missing_imports = True
-
-      [mypy-proto.*]
-      ignore_missing_imports = True
-
-      [mypy-pytest]
-      ignore_missing_imports = True
-
-      [mypy-google.cloud.*]
-      ignore_errors = True
-
-      # only verify data client
-      [mypy-google.cloud.bigtable.data.*]
-      ignore_errors = False
-    count: 1
     # Note: noxfile.py is heavily customized so we clobber the whole file. 
   - paths: [
       packages/google-cloud-bigtable/noxfile.py
@@ -431,6 +385,7 @@ replacements:
           "3.12",
           "3.13",
           "3.14",
+          "3.15",
       ]
 
       UNIT_TEST_STANDARD_DEPENDENCIES = [

.librarian/generator-input/client-post-processing/datastore-integration.yaml

@@ -39,42 +39,6 @@ replacements:
           "google-cloud-core >= 2.0.0, <3.0.0",
           "grpcio >= 1.59.0, < 2.0.0",
     count: 1
-  - paths: [
-      "packages/google-cloud-datastore/mypy.ini",
-    ]
-    before: |-
-      # Performance: reuse results from previous runs to speed up 'nox'
-      incremental = True
-    after: |-
-      # Performance: reuse results from previous runs to speed up "nox"
-      incremental = True
-
-      [mypy-google.cloud.datastore._app_engine_key_pb2]
-      ignore_errors = True
-
-      # TODO(https://github.com/googleapis/gapic-generator-python/issues/2410):
-      # Remove once this generator bug is fixed
-      [mypy-google.cloud.datastore_v1.services.datastore.async_client]
-      ignore_errors = True
-
-      # TODO(https://github.com/googleapis/gapic-generator-python/issues/2410):
-      # Remove once this generator bug is fixed
-      [mypy-google.cloud.datastore_v1.services.datastore.client]
-      ignore_errors = True
-    count: 1
-  - paths: [
-      "packages/google-cloud-datastore/mypy.ini",
-    ]
-    before: |
-      ignore_missing_imports = False
-
-      # TODO\(https://github.com/googleapis/gapic-generator-python/issues/2563\):
-      # Dependencies that historically lacks py.typed markers
-      \[mypy-google\.iam\.\*\]
-      ignore_missing_imports = True
-    after: |
-      ignore_missing_imports = True
-    count: 1
   - paths: [
       "packages/google-cloud-datastore/docs/index.rst",
     ]

.librarian/generator-input/client-post-processing/spanner-integration.yaml

@@ -649,6 +649,7 @@ replacements:
           "3.12",
           "3.13",
           "3.14",
+          "3.15",
       ]
       UNIT_TEST_STANDARD_DEPENDENCIES = [
           "mock",

ci/run_single_test.sh

@@ -99,6 +99,11 @@ case ${TEST_TYPE} in
             nox -s unit-3.14
             retval=$?
             ;;
+        "3.15")
+            # This is needed to speed up builds
+            nox --force-venv-backend uv -s unit-3.15
+            retval=$?
+            ;;
         *)
             echo "unsupported PY_VERSION"
             exit 1

librarian.yaml

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 language: python
-version: v0.22.0
+version: v0.22.1-0.20260626155540-a0930f4b0f52
 repo: googleapis/google-cloud-python
 sources:
   googleapis:

packages/bigframes/noxfile.py

@@ -60,7 +60,7 @@
 
 DEFAULT_PYTHON_VERSION = "3.14"
 
-ALL_PYTHON = ["3.10", "3.11", "3.12", "3.13", "3.14"]
+ALL_PYTHON = ["3.10", "3.11", "3.12", "3.13", "3.14", "3.15"]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     PYTEST_VERSION,
@@ -250,6 +250,8 @@ def install_unittest_dependencies(session, install_test_extra, *constraints):
 
 def run_unit(session, install_test_extra):
     """Run the unit test suite."""
+    if session.python == "3.15":
+        session.skip("Wait until pyproj has 3.15 wheels")
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
     )
@@ -289,7 +291,7 @@ def unit(session, test_extra):
         unit_noextras(session)
 
 
-@nox.session(python=ALL_PYTHON[-1])
+@nox.session(python=DEFAULT_PYTHON_VERSION)
 def unit_noextras(session):
     run_unit(session, install_test_extra=False)
 
@@ -656,7 +658,7 @@ def prerelease(session: nox.sessions.Session, tests_path, extra_pytest_options=(
     )
 
 
-@nox.session(python=ALL_PYTHON[-1])
+@nox.session(python=DEFAULT_PYTHON_VERSION)
 def unit_prerelease(session: nox.sessions.Session):
     """Run the unit test suite with prerelease dependencies."""
     prerelease(session, os.path.join("tests", "unit"))
@@ -1040,7 +1042,7 @@ def core_deps_from_source(session, protobuf_implementation):
     )
 
 
-@nox.session(python=ALL_PYTHON[-1])
+@nox.session(python=DEFAULT_PYTHON_VERSION)
 def prerelease_deps(session):
     """Run all tests with prerelease versions of dependencies installed."""
     # TODO(https://github.com/googleapis/google-cloud-python/issues/16014):

packages/bigquery-magics/noxfile.py

@@ -41,6 +41,7 @@
     "3.12",
     "3.13",
     "3.14",
+    "3.15",
 ]
 
 UNIT_TEST_STANDARD_DEPENDENCIES = [

packages/db-dtypes/noxfile.py

@@ -42,6 +42,7 @@
     "3.12",
     "3.13",
     "3.14",
+    "3.15",
 ]
 
 UNIT_TEST_STANDARD_DEPENDENCIES = [

packages/django-google-spanner/noxfile.py

@@ -34,6 +34,7 @@
     "3.12",
     "3.13",
     "3.14",
+    "3.15",
 ]
 ALL_PYTHON = list(UNIT_TEST_PYTHON_VERSIONS)
 

packages/gcp-sphinx-docfx-yaml/noxfile.py

@@ -17,7 +17,16 @@
 import nox
 
 DEFAULT_PYTHON_VERSION = "3.14"
-UNIT_TEST_PYTHON_VERSIONS = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+UNIT_TEST_PYTHON_VERSIONS = [
+    "3.8",
+    "3.9",
+    "3.10",
+    "3.11",
+    "3.12",
+    "3.13",
+    "3.14",
+    "3.15",
+]
 RUFF_VERSION = "ruff==0.14.14"
 
 ALL_PYTHON = list(UNIT_TEST_PYTHON_VERSIONS)
@@ -138,7 +147,9 @@ def unit(session):
     # Re-enable 3.8, 3.9, 3.11, 3.12, and 3.13 after environment verification.
     # TODO(https://github.com/googleapis/google-cloud-python/issues/16176):
     # Track 3.14 compatibility as upstream dependencies stabilize.
-    _skip_python_session(session, ["3.7", "3.8", "3.9", "3.11", "3.12", "3.13", "3.14"])
+    _skip_python_session(
+        session, ["3.7", "3.8", "3.9", "3.11", "3.12", "3.13", "3.14", "3.15"]
+    )
     session.install("-r", "requirements.txt")
     session.install("pytest", "pytest-cov")
     session.run(