add testing setup

Author: ohmayr

.generator/Dockerfile

@@ -68,4 +68,4 @@ WORKDIR /app
 COPY cli.py .
 
 # Set the entrypoint for the container to run the script.
-ENTRYPOINT ["python3.13", "./cli.py"]
+ENTRYPOINT ["python3.13", "./cli.py"]

.generator/cli.py

@@ -15,15 +15,15 @@
 import argparse
 import sys
 
-def handle_configure(args):
+def handle_configure(dry_run=False):
     # TODO(https://github.com/googleapis/librarian/issues/466): Implement configure command.
     print("'configure' command executed.")
 
-def handle_generate(args):
+def handle_generate(dry_run=False):
     # TODO(https://github.com/googleapis/librarian/issues/448): Implement generate command.
     print("'generate' command executed.")
 
-def handle_build(args):
+def handle_build(dry_run=False):
     # TODO(https://github.com/googleapis/librarian/issues/450): Implement build command.
     print("'build' command executed.")
 
@@ -47,4 +47,4 @@ def handle_build(args):
         sys.exit(1)
 
     args = parser.parse_args()
-    args.func(args)
+    args.func(args)

.generator/test_cli.py

@@ -0,0 +1,25 @@
+# Copyright 2025 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.
+
+from cli import handle_generate, handle_build, handle_configure
+
+
+def test_handle_configure_dry_run():
+    handle_configure(dry_run=True)
+
+def test_handle_generate_dry_run():
+    handle_generate(dry_run=True)
+
+def test_handle_build_dry_run():
+    handle_build(dry_run=True)

.github/workflows/generator.yml

@@ -0,0 +1,30 @@
+on:
+  pull_request:
+    branches:
+      - main
+name: generator
+
+permissions:
+  contents: read
+
+jobs:
+  test_generator_cli:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+      # Use a fetch-depth of 2
+      # 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
+      with:
+        python-version: "3.10"
+    - name: Install pytest
+      run: |
+        python -m pip install pytest
+    - name: Run generator_cli tests
+      run: |
+        pytest .generator/test_cli.py