Function: ert-run-tests-interactively

Run the tests specified by SELECTOR and display the results in a buffer.

SELECTOR works as described in `ert-select-tests'.
OUTPUT-BUFFER-NAME and MESSAGE-FN should normally be nil; they
are used for automated self-tests and specify which buffer to use
and how to display message.

(fn SELECTOR &optional OUTPUT-BUFFER-NAME MESSAGE-FN)