Old markup is creating JS errors in the site editor

[carolinan]

Old block markup in the theme unit test file is creating JavaScript errors in the site editor because the markup is invalid.

We may need to reconsider keeping the old markup in the file, or having different versions of the file for different WordPress versions.

[joyously]

The site editor should be more flexible. There will be lots of sites with older markup, because you write a post once and leave it.