Interactive Functions are not covered when interactive form is a list

[andreyorst]

Calling this function in a ert test shows it as completely uncovered:

(defun foobar (x)
  (interactive
   (list (if current-prefix-arg (read-string "arg: ") "foobar")))
  (message "arg: %s" x))

[xendk]

I've run into this too.

A possible workaround is using with-simulated-input, and calling the function using call-interactively in your test.

Of course, this doesn't cover if one have other functions calling the problematic function non-interactively, but at least it'll get the coverage if of the explicit tests of the function.

Would be nice to get fixed though, it undermines the trust in coverage.