ENH: Run Jupyter notebooks in the tox testing step

Run Jupyter notebooks in the `tox` testing step.

Add `nbconvert` and `nbclient` to the dependencies of the `test` table
in `pyproject.toml` so that the notebooks can be run.

pyproject.toml

@@ -68,6 +68,8 @@ resmon = ["psutil >=5.4"]
 
 test = [
     "coverage",
+    "nbconvert",
+    "nbclient",
     "pytest >= 4.4",
     "pytest-cov",
     "pytest-env",

tox.ini

@@ -37,6 +37,7 @@ extras = test
 commands =
   pytest --doctest-modules --cov eddymotion -n auto --cov-report xml \
   --junitxml=test-results.xml -v src test {posargs}
+  python -m nbconvert --to notebook --execute docs/notebooks/*.ipynb {posargs}
 
 [testenv:docs]
 description = Build documentation site