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diff --git a/test/lisp/hfy-cmap-tests.el b/test/lisp/hfy-cmap-tests.el
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+;;; hfy-cmap-tests.el --- tests for hfy-cmap.el -*- lexical-binding: t -*-
+
+;; Copyright (C) 2020 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'ert)
+(require 'ert-x)
+(require 'hfy-cmap)
+
+(defconst hfy-cmap-tests--data
+  (concat "255 250 250		snow\n"
+          "248 248 255		ghost white\n"
+          "248 248 255		GhostWhite\n"))
+
+(defconst hfy-cmap-tests--parsed
+  '(("GhostWhite" 248 248 255)
+    ("ghost white" 248 248 255)
+    ("snow" 255 250 250)))
+
+(ert-deftest test-hfy-cmap--parse-buffer ()
+  (with-temp-buffer
+    (insert hfy-cmap-tests--data)
+    (should (equal (hfy-cmap--parse-buffer (current-buffer))
+                   hfy-cmap-tests--parsed))))
+
+(ert-deftest test-htmlfontify-load-rgb-file ()
+  :tags '(:expensive-test)
+  (let (hfy-rgb-txt-color-map)
+    (htmlfontify-load-rgb-file (ert-resource-file "rgb.txt"))
+    (should (equal hfy-rgb-txt-color-map
+                   hfy-cmap-tests--parsed))))
+
+(ert-deftest test-htmlfontify-load-rgb-file/non-existent-file ()
+  (let (hfy-rgb-txt-color-map)
+    (htmlfontify-load-rgb-file "/non/existent/file")
+    (should-not hfy-rgb-txt-color-map)))
+
+(provide 'hfy-cmap-tests)
+;;; hfy-cmap-tests.el ends here