+;; `read-file-name' by default uses `completing-read' function to read
+;; user input. It does not respect `standard-input' variable which we
+;; use in tests to provide user input. So replace it with a plain
+;; `read' call.
+(setq read-file-name-function (lambda (&rest _) (read)))
+
+(defun notmuch-test-wait ()
+ "Wait for process completion."
+ (while (get-buffer-process (current-buffer))
+ (sleep-for 0.1)))
+
+(defun test-output (&optional filename)
+ "Save current buffer to file FILENAME. Default FILENAME is OUTPUT."
+ (write-region (point-min) (point-max) (or filename "OUTPUT")))
+
+(defun test-visible-output (&optional filename)
+ "Save visible text in current buffer to file FILENAME. Default
+FILENAME is OUTPUT."
+ (let ((text (visible-buffer-string)))
+ (with-temp-file (or filename "OUTPUT") (insert text))))
+