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(require 'cl-lib)
(require 'notmuch-mua)
(defun subject-check-test (&optional fn)
"Test `notmuch-mua-subject-check'.
Optionally, evaluate FN before doing the test.
Return t if the message would be sent, and nil otherwise."
(notmuch-mua-mail)
(message-goto-subject)
(when fn
(funcall fn))
(prog1
(condition-case nil
;; Force `y-or-n-p' to always return `nil', as if the user
;; pressed "n".
(cl-letf (((symbol-function 'y-or-n-p)
(lambda (&rest args) nil)))
(notmuch-mua-subject-check)
t)
('error nil))
(set-buffer-modified-p nil)
(kill-buffer (current-buffer))))
(defvar subject-check-tests
'(;; These are okay.
(t . (lambda () (insert "something")))
;; These should not be okay.
(nil)
(nil . (lambda () (insert " ")))
(nil . (lambda () (insert " ")))
(nil . (lambda () (insert " "))) ; NON-BREAKING SPACE
))
(defun notmuch-test-subject-warning-1 ()
(let (output expected)
(dolist (test subject-check-tests)
(let* ((expect (car test))
(body (cdr test))
(result (subject-check-test body)))
(push expect expected)
(push (if (eq result expect)
result
;; In the case of a failure, include the test
;; details to make it simpler to debug.
(format "%S <-- %S" result body))
output)))
(notmuch-test-expect-equal output expected)))
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