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diff --git a/test/lisp/hl-line-tests.el b/test/lisp/hl-line-tests.el
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+;;; hl-line-tests.el --- Test suite for hl-line. -*- lexical-binding: t -*-
+
+;; Copyright (C) 2022 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)
+(require 'hl-line)
+
+(defsubst hl-line-tests-verify (_label on-p)
+  (if on-p
+      (cl-some (apply-partially #'eq hl-line-overlay)
+               (overlays-at (point)))
+    (not (cl-some (apply-partially #'eq hl-line-overlay)
+                  (overlays-at (point))))))
+
+(ert-deftest hl-line-tests-sticky-across-frames ()
+  (skip-unless (display-graphic-p))
+  (customize-set-variable 'global-hl-line-sticky-flag t)
+  (call-interactively #'global-hl-line-mode)
+  (let ((first-frame (selected-frame))
+        (first-buffer "foo")
+        (second-buffer "bar")
+        second-frame)
+    (unwind-protect
+        (progn
+          (switch-to-buffer first-buffer)
+          (save-excursion
+            (insert (buffer-name)))
+          (run-hooks 'post-command-hook)
+          (should (hl-line-tests-verify 111 t))
+          (select-frame (setq second-frame (make-frame)))
+          (switch-to-buffer second-buffer)
+          (save-excursion
+            (insert (buffer-name)))
+          (run-hooks 'post-command-hook)
+          (should (hl-line-tests-verify 762 t))
+          (with-current-buffer first-buffer
+            (should (hl-line-tests-verify 534 t)))
+          (call-interactively #'global-hl-line-mode)
+          (should (hl-line-tests-verify 125 nil))
+          (with-current-buffer first-buffer
+            (should (hl-line-tests-verify 892 nil)))
+
+          ;; now do unsticky
+          (customize-set-variable 'hl-line-sticky-flag nil)
+          (call-interactively #'global-hl-line-mode)
+          (run-hooks 'post-command-hook)
+          (should (hl-line-tests-verify 467 t))
+          (with-current-buffer first-buffer
+            (should (hl-line-tests-verify 765 nil)))
+          (select-frame first-frame)
+          (should (equal (buffer-name) first-buffer))
+          (run-hooks 'post-command-hook)
+          (should (hl-line-tests-verify 423 t))
+          (with-current-buffer second-buffer
+            (should (hl-line-tests-verify 897 nil))))
+      (let (kill-buffer-query-functions)
+        (ignore-errors (kill-buffer first-buffer))
+        (ignore-errors (kill-buffer second-buffer))
+        (ignore-errors (delete-frame second-frame))))))
+
+(ert-deftest hl-line-tests-sticky ()
+  (customize-set-variable 'hl-line-sticky-flag t)
+  (let ((first-buffer "foo")
+        (second-buffer "bar"))
+    (unwind-protect
+        (progn
+          (switch-to-buffer first-buffer)
+          (hl-line-mode 1)
+          (save-excursion
+            (insert (buffer-name)))
+          (run-hooks 'post-command-hook)
+          (should (hl-line-tests-verify 123 t))
+          (switch-to-buffer second-buffer)
+          (hl-line-mode 1)
+          (save-excursion
+            (insert (buffer-name)))
+          (run-hooks 'post-command-hook)
+          (should (hl-line-tests-verify 56 t))
+          (with-current-buffer first-buffer
+            (should (hl-line-tests-verify 67 t)))
+
+          ;; now do unsticky
+          (customize-set-variable 'hl-line-sticky-flag nil)
+          (should (hl-line-tests-verify 234 t))
+          (with-current-buffer first-buffer
+            (should (hl-line-tests-verify 231 nil)))
+          (switch-to-buffer first-buffer)
+          (run-hooks 'post-command-hook)
+          (should (hl-line-tests-verify 257 t))
+          (with-current-buffer second-buffer
+            (should (hl-line-tests-verify 999 nil)))))
+    (let (kill-buffer-query-functions)
+      (ignore-errors (kill-buffer first-buffer))
+      (ignore-errors (kill-buffer second-buffer)))))
+
+(provide 'hl-line-tests)
+
+;;; hl-line-tests.el ends here