No, testing (in terms of software testing) refers to the process of verifying something is working as expected. The test suite for youtube-dl is/was using snipp

No, testing (in terms of software testing) refers to the process of verifying something is working as expected. The test suite for youtube-dl is/was using snippets of DRM protected material to ensure that their anti-DRM techniques were working as expected. Showing a screenshot of copyrighted material is just that, showing a screenshot of copyrighted material. Nothing is downloaded, asserted or even evaluated. For all we know, they can have a license for that material (or live in Germany, where ripping your owned DVD disks is legal). Two vastly different things.