feat: add Dockerfile for containerized development (#37)

.dockerignore

@@ -0,0 +1,48 @@
+# Git
+.git
+.gitignore
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+.pytest_cache/
+.coverage
+htmlcov/
+
+# Logs and Backups
+logs/
+backups/
+
+# Node
+node_modules/
+package-lock.json
+
+# Environment
+.env
+.venv
+venv/
+ENV/
+
+# IDEs
+.vscode/
+.idea/
+*.swp
+*.swo

Dockerfile

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+FROM python:3.12-slim
+
+# Prevent Python from writing .pyc files and enable unbuffered output
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1
+
+# Set working directory
+WORKDIR /app
+
+# Install system dependencies (git is required for the agent to commit/push)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install python dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the rest of the application
+COPY . .
+
+# Ensure the entrypoint is executable
+RUN chmod +x main.py
+
+# Entry command
+ENTRYPOINT ["python", "main.py"]

tests/test_utils.py

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+import pytest
+from utils import calculate_average, find_max, normalize, parse_int_list
+
+def test_calculate_average():
+    assert calculate_average([1, 2, 3, 4, 5]) == 3.0
+    assert calculate_average([10, 20]) == 15.0
+    with pytest.raises(ValueError, match="Cannot calculate average of an empty list"):
+        calculate_average([])
+
+def test_find_max():
+    assert find_max([1, 5, 3, 9, 2]) == 9
+    assert find_max([-10, -5, -20]) == -5
+    with pytest.raises(ValueError, match="Cannot find max of an empty list"):
+        find_max([])
+
+def test_normalize():
+    assert normalize([0, 5, 10]) == [0.0, 0.5, 1.0]
+    assert normalize([10, 20, 30, 40, 50]) == [0.0, 0.25, 0.5, 0.75, 1.0]
+
+    with pytest.raises(ValueError, match="Cannot normalize an empty list"):
+        normalize([])
+
+    with pytest.raises(ValueError, match="Cannot normalize a constant list"):
+        normalize([5, 5, 5])
+
+def test_parse_int_list():
+    assert parse_int_list("1,2,3,4") == [1, 2, 3, 4]
+    assert parse_int_list(" 10 , 20, 30 ") == [10, 20, 30]
+    assert parse_int_list("-5,0,5") == [-5, 0, 5]
+
+    with pytest.raises(ValueError, match="Input string is empty"):
+        parse_int_list("")
+
+    with pytest.raises(ValueError, match="Input string is empty"):
+        parse_int_list("   ")
+
+    with pytest.raises(ValueError, match="invalid integer in input"):
+        parse_int_list("1,2,abc,4")