set up a hello world unit test and Github Actions

.github/workflows/python-app.yml

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+name: Python Application Test
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version: [3.8, 3.9, 3.10, 3.11, 3.12, 3.13]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install pytest
+        pip install -e .
+    - name: Test with pytest
+      run: |
+        pytest ./tests/

phuego/cli_app.py

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+# /repo/phuego/cli_app.py
+import click
+
+@click.command()
+@click.option('--greeting', default='Hello', help='Greeting phrase.')
+@click.option('--name', default='World', help='Name to greet.')
+def greet(greeting, name):
+    """Simple program that greets NAME for a total of COUNT times."""
+    click.echo(f"{greeting}, {name}!")
+
+if __name__ == '__main__':
+    greet()

tests/test_hello_world.py

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+# /repo/tests/test_hello_world.py
+from click.testing import CliRunner
+from phuego.cli_app import greet
+
+def test_greet():
+    runner = CliRunner()
+    result = runner.invoke(greet, ['--name', 'World'])
+    assert result.exit_code == 0
+    assert 'Hello, World!' in result.output