It looks like there is some behat duplication for the comments block, within:

blocks/comments/tests/behat/block_comment_course.feature
blocks/comments/tests/behat/add_comment.feature

The latter (add_comment.feature) is a bit more complete and has been around longer, so I think we should keep it and remove block_comment_course.feature. The only thing missing from add_comment.feature is checking that another user in the course can see the comment that's been made, which we should add and is as easy as adding a login as teacher1 and verifying you see the student1 comment in these 2 scenarios:

• Add a comment with Javascript enabled
• Add a comment with Javascript disabled