One of the developers of Neovim noticed that the search feature in the TAP tests doesn't appear to be working. Anything you type in there results in an empty list. See this for his exact words: https://github.com/neovim/neovim/pull/4411#issuecomment-293395559

I've reproduced it here for your convenience. He said:

    If I try searching for tests in QB via QB own search (use numbers stating how many tests passed/failed/etc to go to a list of tests, there is a search field there) to determine whether QB actually ran new tests, it appears that it never finds anything if search query is anything, but empty.