I think you need to adjust the number of examples expected in tinybuild / sphinx_gallery/tests/test_full.py

Oops, number now updated

So far so good! Based on https://output.circle-artifacts.com/output/job/0dc682b1-1c23-4719-81d6-6e26cec1a970/artifacts/0/tiny_html/auto_examples/plot_matplotlib_backend.html it seems like a good test would be to check in test_full.py something like assert html_output.count('Matplotlib backend is svg') == 2, no?

Sure, I can check the example print output in a unit test, but I should presumably then remove the assert statements in the example itself. If there is a regression, those assert statements would cause to the build to fail before the unit test even has a chance to run.

Ahh you're right, somehow I missed the assert statements. Good enough, thanks @ayshih !

Okay, great!