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diff --git a/test/lisp/makesum-tests.el b/test/lisp/makesum-tests.el
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+;;; makesum-tests.el --- Tests for makesum.el  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2019 Free Software Foundation, Inc.
+
+;; Author: Simen Heggestøyl <simenheg@gmail.com>
+;; Keywords:
+
+;; 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 'makesum)
+
+(ert-deftest makesum-tests-double-column-even-lines ()
+  (with-temp-buffer
+    (insert "a\nb\nc\nd\ne\nf")
+    (double-column (point-min) (point-max))
+    (should (string-match-p "a[ \t]+d\nb[ \t]+e\nc[ \t]+f" (buffer-string)))))
+
+(ert-deftest makesum-tests-double-column-odd-lines ()
+  (with-temp-buffer
+    (insert "a\nb\nc\nd\ne")
+    (double-column (point-min) (point-max))
+    (should (string-match-p "a[ \t]+d\nb[ \t]+e\nc" (buffer-string)))))
+
+(ert-deftest makesum-tests-double-column-noop ()
+  (with-temp-buffer
+    (insert "foo")
+    (let ((prev-buffer-string (buffer-string)))
+      (double-column (point-min) (point-max))
+      (should (equal prev-buffer-string (buffer-string))))))
+
+(ert-deftest makesum-tests-double-column-partial ()
+  (with-temp-buffer
+    (insert "a\nb\nc\nd\ne\nf")
+    (double-column 3 10)
+    (should (string-match-p "a\nb[ \t]+d\nc[ \t]+e\nf" (buffer-string)))))
+
+(provide 'makesum-tests)
+;;; makesum-tests.el ends here