fix: migrate to native namespace packages

setup.py

@@ -16,6 +16,7 @@
 import os
 
 import setuptools
+from setuptools import find_namespace_packages
 
 
 name = "googleapis-common-protos"
@@ -36,12 +37,6 @@
 with io.open(readme_filename, encoding="utf-8") as readme_file:
     readme = readme_file.read()
 
-packages = [
-    package
-    for package in setuptools.PEP420PackageFinder.find()
-    if package.startswith("google")
-]
-
 setuptools.setup(
     name=name,
     version=version,
@@ -66,10 +61,9 @@
     install_requires=dependencies,
     extras_require=extras_require,
     license="Apache-2.0",
-    packages=packages,
     package_data={"": ["*.proto"]},
     python_requires=">=3.7",
-    namespace_packages=["google", "google.logging"],
+    packages=find_namespace_packages(exclude=("tests*", "testing*")),
     url="https://github.com/googleapis/python-api-common-protos",
     include_package_data=True,
 )

tests/unit/test_packaging.py

@@ -0,0 +1,52 @@
+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import os
+import subprocess
+import sys
+
+
+def test_namespace_package_compat(tmp_path):
+    """
+    The ``google`` namespace package should not be masked
+    by the presence of ``googleapis-common-protos``.
+    """
+    google = tmp_path / "google"
+    google.mkdir()
+    google.joinpath("othermod.py").write_text("")
+    env = dict(os.environ, PYTHONPATH=str(tmp_path))
+    cmd = [sys.executable, "-m", "google.othermod"]
+    subprocess.check_call(cmd, env=env)
+
+    """
+    The ``google.cloud`` namespace package should not be masked
+    by the presence of ``googleapis-common-protos``.
+    """
+    google_cloud = tmp_path / "google/cloud"
+    google_cloud.mkdir()
+    google_cloud.joinpath("othermod.py").write_text("")
+    env = dict(os.environ, PYTHONPATH=str(tmp_path))
+    cmd = [sys.executable, "-m", "google.cloud.othermod"]
+    subprocess.check_call(cmd, env=env)
+
+    """
+    The ``google.logging`` namespace package should not be masked
+    by the presence of ``googleapis-common-protos``.
+    """
+    google_logging = tmp_path / "google/logging"
+    google_logging.mkdir()
+    google_logging.joinpath("othermod.py").write_text("")
+    env = dict(os.environ, PYTHONPATH=str(tmp_path))
+    cmd = [sys.executable, "-m", "google.logging.othermod"]
+    subprocess.check_call(cmd, env=env)