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diff --git a/test/lisp/play/studly-tests.el b/test/lisp/play/studly-tests.el
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+;;; studly-tests.el --- Tests for studly.el  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2019-2022 Free Software Foundation, Inc.
+
+;; Author: Stefan Kangas <stefankangas@gmail.com>
+
+;; 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/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'ert)
+(require 'studly)
+
+(ert-deftest studly-tests-studlify-region ()
+  (with-temp-buffer
+    (insert "Studlify this string of text")
+    (studlify-region (point-min) (point-max))
+    (should (equal (buffer-string)
+                   "StudliFy this StrinG of tExt"))))
+
+(ert-deftest studly-tests-studlify-word ()
+  (with-temp-buffer
+    (insert "normal studlified normal")
+    (goto-char 8)
+    (studlify-word 1)
+    (should (equal (buffer-string)
+                   "normal stUdlIfIed normal"))))
+
+(ert-deftest studly-tests-nato-region ()
+  (with-temp-buffer
+    (insert "Studlify\n this\n buffer")
+    (studlify-buffer)
+    (should (equal (buffer-string)
+                   "STuDlify\n This\n buffer"))))
+
+(provide 'studly-tests)
+;;; studly-tests.el ends here