Add test which runs tutorial notebooks

.github/workflows/python.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Set up dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install setuptools build cython pytest pytest-skip-slow wheel lxml numpy scipy
+          pip install setuptools build cython pytest pytest-skip-slow wheel lxml numpy scipy nbformat nbclient ipykernel
       - name: Build source distribution
         run:
           python -m build
@@ -38,7 +38,13 @@ jobs:
           cd dist
           pip install -v pygambit*.tar.gz
       - name: Run tests
-        run: pytest
+        run: |
+          if [ "${{ matrix.python-version }}" = "3.9" ]; then
+            # Python 3.9 on linux skips the notebook execution test (notebooks may require newer kernels/deps)
+            pytest -q -k 'not test_execute_notebook'
+          else
+            pytest
+          fi
 
   macos-13:
     runs-on: macos-13
@@ -56,7 +62,7 @@ jobs:
       - name: Set up dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install cython pytest pytest-skip-slow wheel lxml numpy scipy
+          pip install cython pytest pytest-skip-slow wheel lxml numpy scipy nbformat nbclient ipykernel
       - name: Build extension
         run: |
           python -m pip install -v .
@@ -79,7 +85,7 @@ jobs:
       - name: Set up dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install cython pytest pytest-skip-slow wheel lxml numpy scipy
+          pip install cython pytest pytest-skip-slow wheel lxml numpy scipy nbformat nbclient ipykernel
       - name: Build extension
         run: |
           python -m pip install -v .
@@ -102,7 +108,7 @@ jobs:
       - name: Set up dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install cython pytest pytest-skip-slow wheel lxml numpy scipy
+          pip install cython pytest pytest-skip-slow wheel lxml numpy scipy nbformat nbclient ipykernel
       - name: Build extension
         run: |
           python -m pip install -v .

doc/tutorials/running_locally.rst

@@ -4,7 +4,7 @@ How to run PyGambit tutorials on your computer
 ==============================================
 
 The PyGambit tutorials are available as Jupyter notebooks and can be run interactively using any program that supports Jupyter notebooks, such as JupyterLab or VSCode.
-You will need a working installation of Python 3 (tested with 3.9 and later) on your machine.
+You will need a working installation of Python 3.9+ on your machine to run PyGambit (however the tutorials contain some syntax that may not be compatible with earlier versions of Python than 3.13).
 
 1. To download the tutorials, open your OS's command prompt and clone the Gambit repository from GitHub, then navigate to the tutorials directory: ::
 

tests/test_tutorials.py

@@ -0,0 +1,55 @@
+import contextlib
+from pathlib import Path
+
+import nbformat
+import pytest
+from nbclient import NotebookClient
+from nbclient.exceptions import CellExecutionError
+
+
+def _find_tutorial_notebooks():
+    """Return a sorted list of notebook Paths under doc/tutorials.
+
+    Skips the entire module if the tutorials directory does not exist.
+    """
+    root = Path(__file__).resolve().parents[1] / "doc" / "tutorials"
+    if not root.exists():
+        pytest.skip(f"Tutorials folder not found: {root}")
+    notebooks = sorted(root.rglob("*.ipynb"))
+    if not notebooks:
+        pytest.skip(f"No tutorial notebooks found in: {root}")
+    return notebooks
+
+
+# Discover notebooks at import time so pytest can parametrize them.
+_NOTEBOOKS = _find_tutorial_notebooks()
+
+
+@pytest.mark.parametrize("nb_path", _NOTEBOOKS, ids=[p.name for p in _NOTEBOOKS])
+def test_execute_notebook(nb_path):
+    """Execute a single Jupyter notebook and fail if any cell errors occur.
+
+    This uses nbclient.NotebookClient to run the notebook in its parent directory
+    so relative paths within the notebook resolve correctly.
+    """
+    nb = nbformat.read(str(nb_path), as_version=4)
+
+    # Prefer the notebook's kernelspec if provided, otherwise let nbclient pick the default.
+    kernel_name = nb.metadata.get("kernelspec", {}).get("name")
+
+    client = NotebookClient(
+        nb,
+        timeout=600,
+        kernel_name=kernel_name,
+        resources={"metadata": {"path": str(nb_path.parent)}},
+    )
+
+    try:
+        client.execute()
+    except CellExecutionError as exc:
+        # Re-raise with more context so pytest shows which notebook failed.
+        raise AssertionError(f"Error while executing notebook {nb_path}: {exc}") from exc
+    finally:
+        # Ensure kernel is shut down.
+        with contextlib.suppress(Exception):
+            client.shutdown_kernel()