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+;;; typescript-mode-test-utilities --- This file contains test utilities for typescript-mode.el
+
+;;; Commentary:
+;; See typescript-mode-tests.el and typescript-mode-jsdoc-tests.el
+
+;;; Code:
+
+(require 'ert)
+(require 'typescript-mode)
+
+;; Adapted from jdee-mode's test suite.
+(defmacro test-with-temp-buffer (content &rest body)
+  "Fill a temporary buffer with `CONTENT' and eval `BODY' in it."
+  (declare (debug t)
+           (indent 1))
+  `(with-temp-buffer
+     (insert ,content)
+     (typescript-mode)
+     (goto-char (point-min))
+     ;; We need this so that tests that simulate user actions operate on the right buffer.
+     (switch-to-buffer (current-buffer))
+     ,@body))
+
+(defmacro test-with-fontified-buffer (content &rest body)
+  "Fill a temporary buffer with `CONTENT' and eval `BODY' in it."
+  (declare (debug t)
+           (indent 1))
+  `(test-with-temp-buffer
+    ,content
+     (font-lock-fontify-buffer)
+     ,@body))
+
+(defun get-face-at (loc)
+  "Get the face at `LOC'.
+If it is not a number, then we `re-search-forward' with `LOC'
+as the search pattern."
+  (when (not (numberp loc))
+    (save-excursion
+      (re-search-forward loc)
+      (setq loc (match-beginning 0))))
+  (get-text-property loc 'face))
+
+(defun font-lock-test (contents expected)
+  "Perform a test on our template.
+`CONTENTS' is the string to put in the temporary buffer.
+`EXPECTED' is the expected results.
+It should be a list of (LOCATION . FACE) pairs, where
+LOCATION can be either a single location, or list of locations,
+that are all expected to have the same face."
+  (test-with-fontified-buffer
+   contents
+   ;; Make sure our propertize function has been applied to the whole
+   ;; buffer.
+   (syntax-propertize (point-max))
+   (dolist (spec expected)
+     (if (listp (car spec))
+         (dolist (source (car spec))
+           (should (eq (get-face-at source) (cdr spec))))
+       (should (eq (get-face-at (car spec)) (cdr spec)))))))
+
+(provide 'typescript-mode-test-utilities)
+
+;;; typescript-mode-test-utilities.el ends here