+(defun context-coloring-test-assert-position-level (position level)
+ "Assert that POSITION has LEVEL."
+ (let ((face (get-text-property position 'face))
+ actual-level)
+ (when (not (and face
+ (let* ((face-string (symbol-name face))
+ (matches (string-match
+ context-coloring-level-face-regexp
+ face-string)))
+ (when matches
+ (setq actual-level (string-to-number
+ (substring face-string
+ (match-beginning 1)
+ (match-end 1))))
+ (= level actual-level)))))
+ (ert-fail (format (concat "Expected level at position %s, "
+ "which is \"%s\", to be %s; "
+ "but it was %s")
+ position
+ (buffer-substring-no-properties position (1+ position)) level
+ actual-level)))))
+
+(defun context-coloring-test-assert-position-face (position face-regexp)
+ "Assert that the face at POSITION satisfies FACE-REGEXP."
+ (let ((face (get-text-property position 'face)))
+ (when (or
+ ;; Pass a non-string to do an `eq' check (against a symbol or nil).
+ (unless (stringp face-regexp)
+ (not (eq face-regexp face)))
+ ;; Otherwise do the matching.
+ (when (stringp face-regexp)
+ (not (string-match-p face-regexp (symbol-name face)))))
+ (ert-fail (format (concat "Expected face at position %s, "
+ "which is \"%s\", to be %s; "
+ "but it was %s")
+ position
+ (buffer-substring-no-properties position (1+ position)) face-regexp
+ face)))))
+
+(defun context-coloring-test-assert-position-comment (position)
+ (context-coloring-test-assert-position-face
+ position "\\`font-lock-comment\\(-delimiter\\)?-face\\'"))
+
+(defun context-coloring-test-assert-position-string (position)
+ (context-coloring-test-assert-position-face position 'font-lock-string-face))
+
+(defun context-coloring-test-assert-coloring (map)
+ "Assert that the current buffer's coloring matches MAP."
+ ;; Omit the superfluous, formatting-related leading newline. Can't use
+ ;; `save-excursion' here because if an assertion fails it will cause future
+ ;; tests to get messed up.
+ (goto-char (point-min))
+ (let* ((map (substring map 1))
+ (index 0)
+ char-string
+ char)
+ (while (< index (length map))
+ (setq char-string (substring map index (1+ index)))
+ (setq char (string-to-char char-string))
+ (cond
+ ;; Newline
+ ((= char 10)
+ (next-logical-line)
+ (beginning-of-line))
+ ;; Number
+ ((and (>= char 48)
+ (<= char 57))
+ (context-coloring-test-assert-position-level
+ (point) (string-to-number char-string))
+ (forward-char))
+ ;; ';' = Comment
+ ((= char 59)
+ (context-coloring-test-assert-position-comment (point))
+ (forward-char))
+ ;; 's' = String
+ ((= char 115)
+ (context-coloring-test-assert-position-string (point))
+ (forward-char))
+ (t
+ (forward-char)))
+ (setq index (1+ index)))))
+