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+;;; org-zettelkasten-test.el --- Tests for org-zettelkasten  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2021-2023  Yann Herklotz
+
+;; Author: Yann Herklotz <git@yannherklotz.com>
+;; Maintainer: Yann Herklotz <git@yannherklotz.com>
+
+;; This program 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.
+;;
+;; This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Work-in-progress tests.
+
+;;; Code:
+
+(require 'org-zettelkasten)
+(require 'ert)
+
+(ert-deftest org-zettelkasten-test-incr-id-numeric ()
+  "Test increment of purely numeric IDs."
+  (should (string= (org-zettelkasten--incr-id "1") "2"))
+  (should (string= (org-zettelkasten--incr-id "9") "10"))
+  (should (string= (org-zettelkasten--incr-id "1023") "1024"))
+  (should (string= (org-zettelkasten--incr-id "939") "940"))
+  (should (string= (org-zettelkasten--incr-id "39999") "40000")))
+
+(ert-deftest org-zettelkasten-test-incr-id-alpha ()
+  "Test increment of purely alpha IDs."
+  (should (string= (org-zettelkasten--incr-id "a") "b"))
+  (should (string= (org-zettelkasten--incr-id "z") "aa"))
+  (should (string= (org-zettelkasten--incr-id "roina") "roinb"))
+  (should (string= (org-zettelkasten--incr-id "zzzzzzzzz") "aaaaaaaaaa"))
+  (should (string= (org-zettelkasten--incr-id "bhz") "bia")))
+
+(ert-deftest org-zettelkasten-test-incr-id-mixed ()
+  "Test increment of mixed realistic IDs."
+  (should (string= (org-zettelkasten--incr-id "1a1a1a") "1a1a1b"))
+  (should (string= (org-zettelkasten--incr-id "1a1a1a1") "1a1a1a2")))