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diff --git a/test/lisp/erc/erc-scenarios-scrolltobottom.el b/test/lisp/erc/erc-scenarios-scrolltobottom.el
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+;;; erc-scenarios-scrolltobottom.el --- erc-scrolltobottom-mode -*- lexical-binding: t -*-
+
+;; Copyright (C) 2023 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-x)
+(eval-and-compile
+  (let ((load-path (cons (ert-resource-directory) load-path)))
+    (require 'erc-scenarios-common)))
+
+(require 'erc-goodies)
+
+;; These two actually seem to run fine on Emacs 28, but skip them for
+;; now to stay in sync with `erc-scenarios-scrolltobottom--relaxed'.
+
+(ert-deftest erc-scenarios-scrolltobottom--normal ()
+  :tags `(:expensive-test ,@(and (getenv "ERC_TESTS_GRAPHICAL")
+                                 '(:erc--graphical)))
+  (when (version< emacs-version "29") (ert-skip "Times out"))
+
+  (should-not erc-scrolltobottom-all)
+
+  (erc-scenarios-common-scrolltobottom--normal
+   (lambda ()
+     (ert-info ("New insertion doesn't anchor prompt in other window")
+       (let ((w (next-window)))
+         ;; We're at prompt but not aligned to bottom.
+         (should (>= (window-point w) erc-input-marker))
+         (erc-d-t-wait-for 10
+             (not (erc-scenarios-common--at-win-end-p w))))))))
+
+(ert-deftest erc-scenarios-scrolltobottom--all ()
+  :tags `(:expensive-test ,@(and (getenv "ERC_TESTS_GRAPHICAL")
+                                 '(:erc--graphical)))
+  (when (version< emacs-version "29") (ert-skip "Times out"))
+
+  (should-not erc-scrolltobottom-all)
+
+  (let ((erc-scrolltobottom-all t))
+
+    (erc-scenarios-common-scrolltobottom--normal
+     (lambda ()
+       (ert-info ("New insertion anchors prompt in other window")
+         (let ((w (next-window)))
+           ;; We're at prompt and aligned to bottom.
+           (should (>= (window-point w) erc-input-marker))
+           (erc-d-t-wait-for 10
+               (erc-scenarios-common--at-win-end-p w))
+           (erc-d-t-ensure-for 0.5
+               (erc-scenarios-common--at-win-end-p w))))))))
+
+;;; erc-scenarios-scrolltobottom.el ends here