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+;;; gyp-tests.el - unit tests for gyp-mode.
+
+;; Copyright (c) 2012 Google Inc. All rights reserved.
+;; Use of this source code is governed by a BSD-style license that can be
+;; found in the LICENSE file.
+
+;; The recommended way to run these tests is to run them from the command-line,
+;; with the run-unit-tests.sh script.
+
+(require 'cl)
+(require 'ert)
+(require 'gyp)
+
+(defconst samples (directory-files "testdata" t ".gyp$")
+  "List of golden samples to check")
+
+(defun fontify (filename)
+  (with-temp-buffer
+    (insert-file-contents-literally filename)
+    (gyp-mode)
+    (font-lock-fontify-buffer)
+    (buffer-string)))
+
+(defun read-golden-sample (filename)
+  (with-temp-buffer
+    (insert-file-contents-literally (concat filename ".fontified"))
+    (read (current-buffer))))
+
+(defun equivalent-face (face)
+  "For the purposes of face comparison, we're not interested in the
+   differences between certain faces. For example, the difference between
+   font-lock-comment-delimiter and font-lock-comment-face."
+  (case face
+    ((font-lock-comment-delimiter-face) font-lock-comment-face)
+    (t face)))
+
+(defun text-face-properties (s)
+  "Extract the text properties from s"
+  (let ((result (list t)))
+    (dotimes (i (length s))
+      (setq result (cons (equivalent-face (get-text-property i 'face s))
+                         result)))
+    (nreverse result)))
+
+(ert-deftest test-golden-samples ()
+  "Check that fontification produces the same results as the golden samples"
+  (dolist (sample samples)
+    (let ((golden (read-golden-sample sample))
+          (fontified (fontify sample)))
+      (should (equal golden fontified))
+      (should (equal (text-face-properties golden)
+                     (text-face-properties fontified))))))
+
+(defun create-golden-sample (filename)
+  "Create a golden sample by fontifying filename and writing out the printable
+   representation of the fontified buffer (with text properties) to the
+   FILENAME.fontified"
+  (with-temp-file (concat filename ".fontified")
+    (print (fontify filename) (current-buffer))))
+
+(defun create-golden-samples ()
+  "Recreate the golden samples"
+  (dolist (sample samples) (create-golden-sample sample)))