You mean !std::sized_sentinel_for, since these iterators are merely bidirectional. (Sized-sentinel-ness essentially requires random-access iterators, because it requires subtraction to work.)
Ship it, since it fixes typos in the tests.
But, like, none of these tests are useful, IMO. It's arguably useful to test in one place (namely in the reverse_iterator tests) that declval<T>() == declval<reverse_iterator<T>>() is SFINAE-friendly ill-formed; but testing it indirectly, via the same 4 copied lines, pasted among 10 different container tests, and only tested in C++20 mode, is not so useful.