Include test notebooks in test package

Additionally, the test requires `nbconvert` to execute, and `ipykernel`
as the Python 3 kernel.

Author: QuLogic

lib/matplotlib/tests/test_backend_nbagg.py

@@ -6,6 +6,8 @@
 import pytest
 
 nbformat = pytest.importorskip('nbformat')
+pytest.importorskip('nbconvert')
+pytest.importorskip('ipykernel')
 
 # From https://blog.thedataincubator.com/2016/06/testing-jupyter-notebooks/
 

setupext.py

@@ -480,6 +480,7 @@ def get_package_data(self):
                 *_pkg_data_helper('matplotlib', 'tests/tinypages'),
                 'tests/cmr10.pfb',
                 'tests/mpltest.ttf',
+                'tests/test_*.ipynb',
             ],
             'mpl_toolkits': [
                 *_pkg_data_helper('mpl_toolkits', 'tests/baseline_images'),