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diff --git a/haunt/tests/captcha.scm b/haunt/tests/captcha.scm
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+;;; Copyright © 2019 - 2023 Jakob L. Kreuze <zerodaysfordays@sdf.org>
+;;;
+;;; 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
+;;; <http://www.gnu.org/licenses/>.
+
+(use-modules (jakob dynamic captcha)
+             (srfi srfi-64))
+
+(test-begin "id-queue-test")
+
+(define queue (make-queue 4 #:min-free-threshold 2))
+
+(define id1 (dequeue-id! queue))
+(define id2 (dequeue-id! queue))
+
+;; Two IDs are unique, if drawn in such a way that one is not invalidated by the
+;; time the other is drawn.
+(test-assert (number? id1))
+(test-assert (number? id2))
+(test-assert (not (= id1 id2)))
+
+;; IDs can be released and are appropriately removed from the allocated list.
+(test-assert (positive? (length (id-queue-allocated queue))))
+(release-id! id1 queue)
+(release-id! id2 queue)
+(test-assert (zero? (length (id-queue-allocated queue))))
+
+;; IDs are unconditionally freed under pressure.
+(define id11 (dequeue-id! queue))
+(define id12 (dequeue-id! queue))
+(define id13 (dequeue-id! queue))
+(define id14 (dequeue-id! queue))
+(test-assert (member id11 (id-queue-free queue)))
+
+(test-end "id-queue-test")