chore: add core_deps and prerelease_deps nox sessions

SUPPORT.md

@@ -56,4 +56,3 @@ Consider using [Google Cloud Customer Care](https://cloud.google.com/support/?hl
 -   Go to the correct repository, as identified above
     1.  Search for issues already opened (in this repository, those would be in <https://github.com/googleapis/google-cloud-python/issues>). If you find your problem already filed, just add any more context or details that seem appropriate.
     2.  If your problem has not been previously filed, file an issue. If you're filing  in this repository, choose either the [bug report](https://github.com/googleapis/google-cloud-python/issues/new?template=bug_report.yaml) or [feature request](https://github.com/googleapis/google-cloud-python/issues/new?template=feature_request.yaml) template, fill in the details, and submit the issue with an informative title!
-

packages/google-auth/noxfile.py

@@ -14,6 +14,7 @@
 
 import os
 import pathlib
+import re
 import shutil
 
 import nox
@@ -33,6 +34,12 @@
 ]
 
 DEFAULT_PYTHON_VERSION = "3.14"
+
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2450):
+# Switch this to Python 3.15 alpha1
+# https://peps.python.org/pep-0790/
+PREVIEW_PYTHON_VERSION = "3.14"
+
 UNIT_TEST_PYTHON_VERSIONS = [
     "3.10",
     "3.11",
@@ -42,6 +49,24 @@
 ]
 ALL_PYTHON = UNIT_TEST_PYTHON_VERSIONS.copy()
 
+UNIT_TEST_STANDARD_DEPENDENCIES = [
+    "mock",
+    "asyncmock",
+    "pytest",
+    "pytest-cov",
+    "pytest-asyncio",
+]
+UNIT_TEST_EXTERNAL_DEPENDENCIES: list[str] = []
+
+SYSTEM_TEST_STANDARD_DEPENDENCIES = [
+    "mock",
+    "pytest",
+    "google-cloud-testutils",
+]
+SYSTEM_TEST_EXTERNAL_DEPENDENCIES: list[str] = []
+SYSTEM_TEST_EXTRAS: list[str] = []
+SYSTEM_TEST_EXTRAS_BY_PYTHON: dict[str, list[str]] = {}
+
 # Error if a python version is missing
 nox.options.error_on_missing_interpreters = True
 
@@ -111,7 +136,7 @@ def format(session):
         "--select",
         "I",
         "--fix",
-        f"--target-version=py{ALL_PYTHON[0].replace('.', '')}",
+        f"--target-version=py{UNIT_TEST_PYTHON_VERSIONS[0].replace('.', '')}",
         "--line-length=88",
         *BLACK_PATHS,
     )
@@ -143,7 +168,7 @@ def mypy(session):
     session.run("mypy", "-p", "google", "-p", "tests", "-p", "tests_async")
 
 
-@nox.session(python=ALL_PYTHON)
+@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
 @nox.parametrize(["install_deprecated_extras"], (True, False))
 def unit(session, install_deprecated_extras):
     # Install all test dependencies, then install this package in-place.
@@ -220,23 +245,159 @@ def docfx(session):
     session.skip("This package does not have documentation in cloud.google.com")
 
 
-@nox.session(python=DEFAULT_PYTHON_VERSION)
-def prerelease_deps(session):
-    """Run all tests with pre-release versions of dependencies installed
+@nox.session(python=PREVIEW_PYTHON_VERSION)
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb"],
+)
+def prerelease_deps(session, protobuf_implementation):
+    """
+    Run all tests with pre-release versions of dependencies installed
     rather than the standard non pre-release versions.
     Pre-release versions can be installed using
     `pip install --pre <package>`.
     """
-    # TODO(https://github.com/googleapis/google-cloud-python/issues/16013):
-    # Add prerelease tests
-    session.skip("Prerelease tests are not yet supported")
+
+    # Install all dependencies
+    session.install("-e", ".[testing,rsa]")
+    session.install("oauth2client")
+
+    # Install dependencies for the unit test environment
+    unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
+    session.install(*unit_deps_all)
+
+    # Because we test minimum dependency versions on the minimum Python
+    # version, the first version we test with in the unit tests sessions has a
+    # constraints file containing all dependencies and extras.
+    with open(
+        CURRENT_DIRECTORY / "testing" / f"constraints-{ALL_PYTHON[0]}.txt",
+        encoding="utf-8",
+    ) as constraints_file:
+        constraints_text = constraints_file.read()
+
+    # Ignore leading whitespace and comment lines.
+    constraints_deps = [
+        match.group(1)
+        for match in re.finditer(
+            r"^\s*(\S+)(?===\S+)", constraints_text, flags=re.MULTILINE
+        )
+    ]
+
+    # Install dependencies specified in `testing/constraints-X.txt`.
+    session.install(*constraints_deps)
+
+    # Note: If a dependency is added to the `prerel_deps` list,
+    # the `core_dependencies_from_source` list in the `core_deps_from_source`
+    # nox session should also be updated.
+    prerel_deps = [
+        "googleapis-common-protos",
+        "google-api-core",
+        "google-auth",
+        "grpc-google-iam-v1",
+        "grpcio>=1.75.1" if session.python >= "3.12" else "grpcio<=1.62.2",
+        "grpcio-status",
+        "protobuf",
+        "proto-plus",
+    ]
+
+    for dep in prerel_deps:
+        session.install("--pre", "--no-deps", "--ignore-installed", dep)
+        # TODO(https://github.com/grpc/grpc/issues/38965): Add `grpcio-status``
+        # to the dictionary below once this bug is fixed.
+        # TODO(https://github.com/googleapis/google-cloud-python/issues/13643): Add
+        # `googleapis-common-protos` and `grpc-google-iam-v1` to the dictionary below
+        # once this bug is fixed.
+        package_namespaces = {
+            "google-api-core": "google.api_core",
+            "google-auth": "google.auth",
+            "grpcio": "grpc",
+            "protobuf": "google.protobuf",
+            "proto-plus": "proto",
+        }
+
+        version_namespace = package_namespaces.get(dep)
+
+        print(f"Installed {dep}")
+        if version_namespace:
+            session.run(
+                "python",
+                "-c",
+                f"import {version_namespace}; print({version_namespace}.__version__)",
+            )
+
+    session.run(
+        "py.test",
+        "tests",
+        "tests_async",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )
 
 
 @nox.session(python=DEFAULT_PYTHON_VERSION)
-def core_deps_from_source(session):
+@nox.parametrize(
+    "protobuf_implementation",
+    ["python", "upb"],
+)
+def core_deps_from_source(session, protobuf_implementation):
     """Run all tests with core dependencies installed from source
     rather than pulling the dependencies from PyPI.
     """
-    # TODO(https://github.com/googleapis/google-cloud-python/issues/16013):
-    # Add prerelease tests
-    session.skip("Prerelease tests are not yet supported")
+
+    # Install all dependencies
+    session.install("-e", ".[testing,rsa]")
+    session.install("oauth2client")
+
+    # Install dependencies for the unit test environment
+    unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
+    session.install(*unit_deps_all)
+
+    # Because we test minimum dependency versions on the minimum Python
+    # version, the first version we test with in the unit tests sessions has a
+    # constraints file containing all dependencies and extras.
+    with open(
+        CURRENT_DIRECTORY
+        / "testing"
+        / f"constraints-{UNIT_TEST_PYTHON_VERSIONS[0]}.txt",
+        encoding="utf-8",
+    ) as constraints_file:
+        constraints_text = constraints_file.read()
+
+    # Ignore leading whitespace and comment lines.
+    constraints_deps = [
+        match.group(1)
+        for match in re.finditer(
+            r"^\s*(\S+)(?===\S+)", constraints_text, flags=re.MULTILINE
+        )
+    ]
+
+    # Install dependencies specified in `testing/constraints-X.txt`.
+    session.install(*constraints_deps)
+
+    # TODO(https://github.com/googleapis/gapic-generator-python/issues/2358): `grpcio` and
+    # `grpcio-status` should be added to the list below so that they are installed from source,
+    # rather than PyPI.
+    # TODO(https://github.com/googleapis/gapic-generator-python/issues/2357): `protobuf` should be
+    # added to the list below so that it is installed from source, rather than PyPI
+    # Note: If a dependency is added to the `core_dependencies_from_source` list,
+    # the `prerel_deps` list in the `prerelease_deps` nox session should also be updated.
+    core_dependencies_from_source = [
+        "googleapis-common-protos @ git+https://github.com/googleapis/google-cloud-python#egg=googleapis-common-protos&subdirectory=packages/googleapis-common-protos",
+        "google-api-core @ git+https://github.com/googleapis/google-cloud-python#egg=google-api-core&subdirectory=packages/google-api-core",
+        "grpc-google-iam-v1 @ git+https://github.com/googleapis/google-cloud-python#egg=grpc-google-iam-v1&subdirectory=packages/grpc-google-iam-v1",
+        "proto-plus @ git+https://github.com/googleapis/google-cloud-python#egg=proto-plus&subdirectory=packages/proto-plus",
+    ]
+
+    for dep in core_dependencies_from_source:
+        session.install(dep, "--no-deps", "--ignore-installed")
+        print(f"Installed {dep}")
+
+    session.run(
+        "py.test",
+        "tests",
+        "tests_async",
+        env={
+            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+        },
+    )