diff --git a/lisp/emacs-lisp/ert-x.el b/lisp/emacs-lisp/ert-x.el
index 0180e9e53cc..de18adff5b8 100644
--- a/lisp/emacs-lisp/ert-x.el
+++ b/lisp/emacs-lisp/ert-x.el
@@ -491,6 +491,36 @@ The same keyword arguments are supported as in
   (string-match "Apple \\(LLVM\\|[Cc]lang\\)\\|Xcode\\.app"
                 (shell-command-to-string "gcc --version")))
 
+
+(defvar tramp-methods)
+(defvar tramp-default-host-alist)
+
+;; If this defconst is used in a test file, `tramp' shall be loaded
+;; prior `ert-x'.  There is no default value on w32 systems, which
+;; could work out of the box.
+(defconst ert-remote-temporary-file-directory
+  (when (featurep 'tramp)
+    (cond
+     ((getenv "REMOTE_TEMPORARY_FILE_DIRECTORY"))
+     ((eq system-type 'windows-nt) null-device)
+     (t (add-to-list
+         'tramp-methods
+         '("mock"
+	   (tramp-login-program	     "sh")
+	   (tramp-login-args	     (("-i")))
+	   (tramp-remote-shell	     "/bin/sh")
+	   (tramp-remote-shell-args  ("-c"))
+	   (tramp-connection-timeout 10)))
+        (add-to-list
+         'tramp-default-host-alist
+         `("\\`mock\\'" nil ,(system-name)))
+        ;; Emacs's Makefile sets $HOME to a nonexistent value.  Needed
+        ;; in batch mode only, therefore.
+        (unless (and (null noninteractive) (file-directory-p "~/"))
+          (setenv "HOME" temporary-file-directory))
+        (format "/mock::%s" temporary-file-directory))))
+    "Temporary directory for remote file tests.")
+
 (provide 'ert-x)
 
 ;;; ert-x.el ends here
diff --git a/test/README b/test/README
index 3d865de78b4..17783a4bacf 100644
--- a/test/README
+++ b/test/README
@@ -118,11 +118,12 @@ If the $EMACS_TEST_JUNIT_REPORT environment variable is set to a file
 name, a JUnit test report is generated under this name.
 
 Some of the tests require a remote temporary directory
-(autorevert-tests.el, filenotify-tests.el, shadowfile-tests.el and
-tramp-tests.el).  Per default, a mock-up connection method is used
-(this might not be possible when running on MS Windows).  If you want
-to test a real remote connection, set $REMOTE_TEMPORARY_FILE_DIRECTORY
-to a suitable value in order to overwrite the default value:
+(autorevert-tests.el, dnd-tests.el, filenotify-tests.el,
+shadowfile-tests.el and tramp-tests.el).  Per default, a mock-up
+connection method is used (this might not be possible when running on
+MS Windows).  If you want to test a real remote connection, set
+$REMOTE_TEMPORARY_FILE_DIRECTORY to a suitable value in order to
+overwrite the default value:
 
     env REMOTE_TEMPORARY_FILE_DIRECTORY=/ssh:host:/tmp make ...
 
diff --git a/test/lisp/autorevert-tests.el b/test/lisp/autorevert-tests.el
index d26e0f5a159..54b1a16b5db 100644
--- a/test/lisp/autorevert-tests.el
+++ b/test/lisp/autorevert-tests.el
@@ -52,10 +52,9 @@
 
 ;;; Code:
 
-(require 'ert)
+(require 'tramp)
 (require 'ert-x)
 (require 'autorevert)
-(require 'tramp)
 
 (setq auto-revert-debug nil
       auto-revert-notify-exclude-dir-regexp "nothing-to-be-excluded"
@@ -70,30 +69,6 @@
 (defvar auto-revert--messages nil
   "Used to collect messages issued during a section of a test.")
 
-;; There is no default value on w32 systems, which could work out of the box.
-(defconst auto-revert-test-remote-temporary-file-directory
-  (cond
-   ((getenv "REMOTE_TEMPORARY_FILE_DIRECTORY"))
-   ((eq system-type 'windows-nt) null-device)
-   (t (add-to-list
-       'tramp-methods
-       '("mock"
-	 (tramp-login-program        "sh")
-	 (tramp-login-args           (("-i")))
-	 (tramp-remote-shell         "/bin/sh")
-	 (tramp-remote-shell-args    ("-c"))
-	 (tramp-connection-timeout   10)))
-      (add-to-list
-       'tramp-default-host-alist
-       `("\\`mock\\'" nil ,(system-name)))
-      ;; Emacs' Makefile sets $HOME to a nonexistent value.  Needed in
-      ;; batch mode only, therefore.  `temporary-file-directory' might
-      ;; be quoted, so we unquote it just in case.
-      (unless (and (null noninteractive) (file-directory-p "~/"))
-        (setenv "HOME" (file-name-unquote temporary-file-directory)))
-      (format "/mock::%s" temporary-file-directory)))
-  "Temporary directory for Tramp tests.")
-
 ;; Filter suppressed remote file-notify libraries.
 (when (stringp (getenv "REMOTE_FILE_NOTIFY_LIBRARY"))
   (dolist (lib '("inotifywait" "gio-monitor" "gvfs-monitor-dir"))
@@ -114,10 +89,9 @@ being the result.")
       t (ignore-errors
 	  (and
 	   (not (getenv "EMACS_HYDRA_CI"))
-	   (file-remote-p auto-revert-test-remote-temporary-file-directory)
-	   (file-directory-p auto-revert-test-remote-temporary-file-directory)
-	   (file-writable-p
-            auto-revert-test-remote-temporary-file-directory))))))
+	   (file-remote-p ert-remote-temporary-file-directory)
+	   (file-directory-p ert-remote-temporary-file-directory)
+	   (file-writable-p ert-remote-temporary-file-directory))))))
   ;; Return result.
   (cdr auto-revert--test-enabled-remote-checked))
 
@@ -146,7 +120,7 @@ This expects `auto-revert--messages' to be bound by
      ,docstring
      :tags '(:expensive-test :unstable)
      (let ((temporary-file-directory
-	    auto-revert-test-remote-temporary-file-directory)
+	    ert-remote-temporary-file-directory)
            (auto-revert-remote-files t)
 	   (ert-test (ert-get-test ',test))
            vc-handled-backends)
diff --git a/test/lisp/dnd-tests.el b/test/lisp/dnd-tests.el
index 7a12cb8347c..1e5b1f823fb 100644
--- a/test/lisp/dnd-tests.el
+++ b/test/lisp/dnd-tests.el
@@ -30,30 +30,7 @@
 (require 'cl-lib)
 (require 'tramp)
 (require 'select)
-
-;; This code was taken from tramp-tests.el: perhaps some of it isn't
-;; strictly necessary.
-(defconst dnd-tests-temporary-file-directory
-  (cond
-   ((getenv "REMOTE_TEMPORARY_FILE_DIRECTORY"))
-   ((eq system-type 'windows-nt) null-device)
-   (t (add-to-list
-       'tramp-methods
-       '("mock"
-	 (tramp-login-program        "sh")
-	 (tramp-login-args           (("-i")))
-	 (tramp-remote-shell         "/bin/sh")
-	 (tramp-remote-shell-args    ("-c"))
-	 (tramp-connection-timeout   10)))
-      (add-to-list
-       'tramp-default-host-alist
-       `("\\`mock\\'" nil ,(system-name)))
-      ;; Emacs's Makefile sets $HOME to a nonexistent value.  Needed
-      ;; in batch mode only, therefore.
-      (unless (and (null noninteractive) (file-directory-p "~/"))
-        (setenv "HOME" temporary-file-directory))
-      (format "/mock::%s" temporary-file-directory)))
-  "Temporary directory for drag-and-drop tests involving remote files.")
+(require 'ert-x)
 
 (defvar dnd-tests-selection-table nil
   "Alist of selection names to their values.")
@@ -108,15 +85,15 @@
   "Return if a test involving remote files can proceed."
   (ignore-errors
     (and
-     (file-remote-p dnd-tests-temporary-file-directory)
-     (file-directory-p dnd-tests-temporary-file-directory)
-     (file-writable-p dnd-tests-temporary-file-directory))))
+     (file-remote-p ert-remote-temporary-file-directory)
+     (file-directory-p ert-remote-temporary-file-directory)
+     (file-writable-p ert-remote-temporary-file-directory))))
 
 (defun dnd-tests-make-temp-name ()
   "Return a temporary remote file name for test.
 The temporary file is not created."
   (expand-file-name (make-temp-name "dnd-test-remote")
-                    dnd-tests-temporary-file-directory))
+                    ert-remote-temporary-file-directory))
 
 (defun dnd-tests-parse-tt-netfile (netfile)
   "Parse NETFILE and return its components.
diff --git a/test/lisp/filenotify-tests.el b/test/lisp/filenotify-tests.el
index 13bb2cd3452..ad0138b2e7b 100644
--- a/test/lisp/filenotify-tests.el
+++ b/test/lisp/filenotify-tests.el
@@ -52,34 +52,9 @@
 
 ;;; Code:
 
-(require 'ert)
+(require 'tramp)
 (require 'ert-x)
 (require 'filenotify)
-(require 'tramp)
-
-;; There is no default value on w32 systems, which could work out of the box.
-(defconst file-notify-test-remote-temporary-file-directory
-  (cond
-   ((getenv "REMOTE_TEMPORARY_FILE_DIRECTORY"))
-   ((eq system-type 'windows-nt) null-device)
-   (t (add-to-list
-       'tramp-methods
-       '("mock"
-	 (tramp-login-program        "sh")
-	 (tramp-login-args           (("-i")))
-	 (tramp-remote-shell         "/bin/sh")
-	 (tramp-remote-shell-args    ("-c"))
-	 (tramp-connection-timeout   10)))
-      (add-to-list
-       'tramp-default-host-alist
-       `("\\`mock\\'" nil ,(system-name)))
-      ;; Emacs' Makefile sets $HOME to a nonexistent value.  Needed in
-      ;; batch mode only, therefore.  `temporary-file-directory' might
-      ;; be quoted, so we unquote it just in case.
-      (unless (and (null noninteractive) (file-directory-p "~/"))
-        (setenv "HOME" (file-name-unquote temporary-file-directory)))
-      (format "/mock::%s" temporary-file-directory)))
-  "Temporary directory for Tramp tests.")
 
 ;; Filter suppressed remote file-notify libraries.
 (when (stringp (getenv "REMOTE_FILE_NOTIFY_LIBRARY"))
@@ -232,12 +207,12 @@ being the result.")
     (let (desc)
       (ignore-errors
         (and
-         (file-remote-p file-notify-test-remote-temporary-file-directory)
-         (file-directory-p file-notify-test-remote-temporary-file-directory)
-         (file-writable-p file-notify-test-remote-temporary-file-directory)
+         (file-remote-p ert-remote-temporary-file-directory)
+         (file-directory-p ert-remote-temporary-file-directory)
+         (file-writable-p ert-remote-temporary-file-directory)
          (setq desc
                (file-notify-add-watch
-                file-notify-test-remote-temporary-file-directory
+                ert-remote-temporary-file-directory
                 '(change) #'ignore))))
       (setq file-notify--test-remote-enabled-checked (cons t desc))
       (when desc (file-notify-rm-watch desc))))
@@ -297,8 +272,7 @@ If UNSTABLE is non-nil, the test is tagged as `:unstable'."
   `(ert-deftest ,(intern (concat (symbol-name test) "-remote")) ()
      ,docstring
      :tags (if ,unstable '(:expensive-test :unstable) '(:expensive-test))
-     (let* ((temporary-file-directory
-	     file-notify-test-remote-temporary-file-directory)
+     (let* ((temporary-file-directory ert-remote-temporary-file-directory)
 	    (ert-test (ert-get-test ',test))
             vc-handled-backends)
        (skip-unless (file-notify--test-remote-enabled))
diff --git a/test/lisp/net/tramp-tests.el b/test/lisp/net/tramp-tests.el
index 621b6ba1c29..87c8eb0ada3 100644
--- a/test/lisp/net/tramp-tests.el
+++ b/test/lisp/net/tramp-tests.el
@@ -44,12 +44,11 @@
 (require 'cl-lib)
 (require 'dired)
 (require 'dired-aux)
-(require 'ert)
+(require 'tramp)
 (require 'ert-x)
 (require 'seq) ; For `seq-random-elt', autoloaded since Emacs 28.1
 (require 'tar-mode)
 (require 'trace)
-(require 'tramp)
 (require 'vc)
 (require 'vc-bzr)
 (require 'vc-git)
@@ -128,6 +127,33 @@ A resource file is in the resource directory as per
 `ert-resource-directory'."
       `(expand-file-name ,file (ert-resource-directory)))))
 
+;; `ert-remote-temporary-file-directory' was introduced in Emacs 29.1.
+(unless (boundp 'ert-remote-temporary-file-directory)
+  (eval-and-compile
+    ;; There is no default value on w32 systems, which could work out
+    ;; of the box.
+    (defconst ert-remote-temporary-file-directory
+      (cond
+       ((getenv "REMOTE_TEMPORARY_FILE_DIRECTORY"))
+       ((eq system-type 'windows-nt) null-device)
+       (t (add-to-list
+           'tramp-methods
+           '("mock"
+	     (tramp-login-program	"sh")
+	     (tramp-login-args		(("-i")))
+	     (tramp-remote-shell	"/bin/sh")
+	     (tramp-remote-shell-args	("-c"))
+	     (tramp-connection-timeout	10)))
+          (add-to-list
+           'tramp-default-host-alist
+           `("\\`mock\\'" nil ,(system-name)))
+          ;; Emacs's Makefile sets $HOME to a nonexistent value.
+          ;; Needed in batch mode only, therefore.
+          (unless (and (null noninteractive) (file-directory-p "~/"))
+            (setenv "HOME" temporary-file-directory))
+          (format "/mock::%s" temporary-file-directory)))
+      "Temporary directory for remote file tests.")))
+
 ;; Beautify batch mode.
 (when noninteractive
   ;; Suppress nasty messages.
@@ -137,32 +163,9 @@ A resource file is in the resource directory as per
     '(fset 'tramp-gvfs-handler-askquestion
 	   (lambda (_message _choices) '(t nil 0)))))
 
-;; There is no default value on w32 systems, which could work out of the box.
-(defconst tramp-test-temporary-file-directory
-  (cond
-   ((getenv "REMOTE_TEMPORARY_FILE_DIRECTORY"))
-   ((eq system-type 'windows-nt) null-device)
-   (t (add-to-list
-       'tramp-methods
-       '("mock"
-	 (tramp-login-program        "sh")
-	 (tramp-login-args           (("-i")))
-	 (tramp-remote-shell         "/bin/sh")
-	 (tramp-remote-shell-args    ("-c"))
-	 (tramp-connection-timeout   10)))
-      (add-to-list
-       'tramp-default-host-alist
-       `("\\`mock\\'" nil ,(system-name)))
-      ;; Emacs's Makefile sets $HOME to a nonexistent value.  Needed
-      ;; in batch mode only, therefore.
-      (unless (and (null noninteractive) (file-directory-p "~/"))
-        (setenv "HOME" temporary-file-directory))
-      (format "/mock::%s" temporary-file-directory)))
-  "Temporary directory for Tramp tests.")
-
 (defconst tramp-test-vec
-  (and (file-remote-p tramp-test-temporary-file-directory)
-       (tramp-dissect-file-name tramp-test-temporary-file-directory))
+  (and (file-remote-p ert-remote-temporary-file-directory)
+       (tramp-dissect-file-name ert-remote-temporary-file-directory))
   "The used `tramp-file-name' structure.")
 
 (setq auth-source-save-behavior nil
@@ -192,9 +195,9 @@ being the result.")
      (cons
       t (ignore-errors
 	  (and
-	   (file-remote-p tramp-test-temporary-file-directory)
-	   (file-directory-p tramp-test-temporary-file-directory)
-	   (file-writable-p tramp-test-temporary-file-directory))))))
+	   (file-remote-p ert-remote-temporary-file-directory)
+	   (file-directory-p ert-remote-temporary-file-directory)
+	   (file-writable-p ert-remote-temporary-file-directory))))))
 
   (when (cdr tramp--test-enabled-checked)
     ;; Cleanup connection.
@@ -213,7 +216,7 @@ The temporary file is not created."
    (if quoted #'tramp-compat-file-name-quote #'identity)
    (expand-file-name
     (make-temp-name "tramp-test")
-    (if local temporary-file-directory tramp-test-temporary-file-directory))))
+    (if local temporary-file-directory ert-remote-temporary-file-directory))))
 
 ;; Method "smb" supports `make-symbolic-link' only if the remote host
 ;; has CIFS capabilities.  tramp-adb.el, tramp-gvfs.el, tramp-rclone.el
@@ -295,12 +298,12 @@ Also see `ignore'."
   "Test availability of Tramp functions."
   :expected-result (if (tramp--test-enabled) :passed :failed)
   (tramp--test-message
-   "Remote directory: `%s'" tramp-test-temporary-file-directory)
+   "Remote directory: `%s'" ert-remote-temporary-file-directory)
   (should (ignore-errors
 	    (and
-	     (file-remote-p tramp-test-temporary-file-directory)
-	     (file-directory-p tramp-test-temporary-file-directory)
-	     (file-writable-p tramp-test-temporary-file-directory)))))
+	     (file-remote-p ert-remote-temporary-file-directory)
+	     (file-directory-p ert-remote-temporary-file-directory)
+	     (file-writable-p ert-remote-temporary-file-directory)))))
 
 (ert-deftest tramp-test01-file-name-syntax ()
   "Check remote file name syntax."
@@ -1997,7 +2000,7 @@ Also see `ignore'."
        (find-file
 	(format
 	 "%s|%s:foo:"
-	 (substring (file-remote-p tramp-test-temporary-file-directory) 0 -1)
+	 (substring (file-remote-p ert-remote-temporary-file-directory) 0 -1)
 	 m))
        :type 'user-error))))
 
@@ -2022,7 +2025,7 @@ Also see `ignore'."
       (should-error
        (tramp-smb-get-localname
 	(tramp-dissect-file-name
-	 (expand-file-name file tramp-test-temporary-file-directory)))
+	 (expand-file-name file ert-remote-temporary-file-directory)))
        :type 'file-error))))
 
 (ert-deftest tramp-test04-substitute-in-file-name ()
@@ -2178,16 +2181,16 @@ Also see `ignore'."
    (string-equal
     (let ((default-directory
 	    (concat
-	     (file-remote-p tramp-test-temporary-file-directory) "/path")))
+	     (file-remote-p ert-remote-temporary-file-directory) "/path")))
       (expand-file-name ".." "./"))
-    (concat (file-remote-p tramp-test-temporary-file-directory) "/"))))
+    (concat (file-remote-p ert-remote-temporary-file-directory) "/"))))
 
 (ert-deftest tramp-test05-expand-file-name-top ()
   "Check `expand-file-name'."
   (skip-unless (tramp--test-enabled))
   (skip-unless (not (tramp--test-ange-ftp-p)))
 
-  (let ((dir (concat (file-remote-p tramp-test-temporary-file-directory) "/")))
+  (let ((dir (concat (file-remote-p ert-remote-temporary-file-directory) "/")))
     (dolist (local '("." ".."))
       (should (string-equal (expand-file-name local dir) dir))
       (should (string-equal (expand-file-name (concat dir local)) dir)))))
@@ -2250,8 +2253,8 @@ This checks also `file-name-as-directory', `file-name-directory',
       ;; We must clear `tramp-default-method'.  On hydra, it is "ftp",
       ;; which ruins the tests.
       (let ((tramp-default-method
-	     (file-remote-p tramp-test-temporary-file-directory 'method))
-	    (host (file-remote-p tramp-test-temporary-file-directory 'host)))
+	     (file-remote-p ert-remote-temporary-file-directory 'method))
+	    (host (file-remote-p ert-remote-temporary-file-directory 'host)))
 	(dolist
 	    (file
 	     `(,(format "/%s::" tramp-default-method)
@@ -2278,8 +2281,8 @@ This checks also `file-name-as-directory', `file-name-directory',
   (skip-unless (tramp--test-emacs29-p))
 
   ;; We must refill the cache.  `file-truename' does it.
-  (file-truename tramp-test-temporary-file-directory)
-  (let* ((remote-host (file-remote-p tramp-test-temporary-file-directory))
+  (file-truename ert-remote-temporary-file-directory)
+  (let* ((remote-host (file-remote-p ert-remote-temporary-file-directory))
 	 (remote-host-nohop
 	  (tramp-make-tramp-file-name (tramp-dissect-file-name remote-host)))
 	 ;; Not all methods can expand "~".
@@ -2368,7 +2371,7 @@ This checks also `file-name-as-directory', `file-name-directory',
 	      (insert-file-contents tmp-name2)
 	      (should (string-equal (buffer-string) "foo")))
 	    ;; Check also that a file transfer with compression works.
-	    (let ((default-directory tramp-test-temporary-file-directory)
+	    (let ((default-directory ert-remote-temporary-file-directory)
 		  (tramp-copy-size-limit 4)
 		  (tramp-inline-compress-start-size 2))
 	      (delete-file tmp-name2)
@@ -2568,7 +2571,7 @@ This checks also `file-name-as-directory', `file-name-directory',
   ;; The function was introduced in Emacs 28.1.
   (skip-unless (boundp 'tar-goto-file))
 
-  (let* ((default-directory tramp-test-temporary-file-directory)
+  (let* ((default-directory ert-remote-temporary-file-directory)
 	 (archive (ert-resource-file "foo.tar.gz"))
 	 (tmp-file (expand-file-name (file-name-nondirectory archive)))
 	 (require-final-newline t)
@@ -3258,7 +3261,7 @@ This tests also `file-directory-p' and `file-accessible-directory-p'."
 (ert-deftest tramp-test17-dired-with-wildcards ()
   "Check `dired' with wildcards."
   ;; `separate' syntax and IPv6 host name syntax do not work.
-  (skip-unless (not (string-match-p "\\[" tramp-test-temporary-file-directory)))
+  (skip-unless (not (string-match-p "\\[" ert-remote-temporary-file-directory)))
   (skip-unless (tramp--test-enabled))
   (skip-unless (tramp--test-sh-p))
   (skip-unless (not (tramp--test-rsync-p)))
@@ -3272,10 +3275,10 @@ This tests also `file-directory-p' and `file-accessible-directory-p'."
             (expand-file-name (tramp--test-make-temp-name nil quoted)))
 	   (tmp-name3 (expand-file-name "foo" tmp-name1))
 	   (tmp-name4 (expand-file-name "bar" tmp-name2))
-	   (tramp-test-temporary-file-directory
+	   (ert-remote-temporary-file-directory
 	    (funcall
 	     (if quoted #'tramp-compat-file-name-quote #'identity)
-	     tramp-test-temporary-file-directory))
+	     ert-remote-temporary-file-directory))
 	   buffer)
       (unwind-protect
 	  (progn
@@ -3293,19 +3296,19 @@ This tests also `file-directory-p' and `file-accessible-directory-p'."
 		(setq buffer
 		      (dired-noselect
 		       (expand-file-name
-			"tramp-test*" tramp-test-temporary-file-directory)))
+			"tramp-test*" ert-remote-temporary-file-directory)))
 	      (goto-char (point-min))
 	      (should
 	       (re-search-forward
 		(regexp-quote
 		 (file-relative-name
-		  tmp-name1 tramp-test-temporary-file-directory))))
+		  tmp-name1 ert-remote-temporary-file-directory))))
 	      (goto-char (point-min))
 	      (should
 	       (re-search-forward
 		(regexp-quote
 		 (file-relative-name
-		  tmp-name2 tramp-test-temporary-file-directory)))))
+		  tmp-name2 ert-remote-temporary-file-directory)))))
 	    (kill-buffer buffer)
 
 	    ;; Check for expanded directory and file names.
@@ -3313,20 +3316,20 @@ This tests also `file-directory-p' and `file-accessible-directory-p'."
 		(setq buffer
 		      (dired-noselect
 		       (expand-file-name
-			"tramp-test*/*" tramp-test-temporary-file-directory)))
+			"tramp-test*/*" ert-remote-temporary-file-directory)))
 	      (goto-char (point-min))
 	      (should
 	       (re-search-forward
 		(regexp-quote
 		 (file-relative-name
-		  tmp-name3 tramp-test-temporary-file-directory))))
+		  tmp-name3 ert-remote-temporary-file-directory))))
 	      (goto-char (point-min))
 	      (should
 	       (re-search-forward
 		(regexp-quote
 		 (file-relative-name
 		  tmp-name4
-		  tramp-test-temporary-file-directory)))))
+		  ert-remote-temporary-file-directory)))))
 	    (kill-buffer buffer)
 
 	    ;; Check for special characters.
@@ -3341,20 +3344,20 @@ This tests also `file-directory-p' and `file-accessible-directory-p'."
 		(setq buffer
 		      (dired-noselect
 		       (expand-file-name
-			"tramp-test*/*" tramp-test-temporary-file-directory)))
+			"tramp-test*/*" ert-remote-temporary-file-directory)))
 	      (goto-char (point-min))
 	      (should
 	       (re-search-forward
 		(regexp-quote
 		 (file-relative-name
-		  tmp-name3 tramp-test-temporary-file-directory))))
+		  tmp-name3 ert-remote-temporary-file-directory))))
 	      (goto-char (point-min))
 	      (should
 	       (re-search-forward
 		(regexp-quote
 		 (file-relative-name
 		  tmp-name4
-		  tramp-test-temporary-file-directory)))))
+		  ert-remote-temporary-file-directory)))))
 	    (kill-buffer buffer))
 
 	;; Cleanup.
@@ -3427,8 +3430,8 @@ This tests also `access-file', `file-readable-p',
     ;; We must use `file-truename' for the temporary directory,
     ;; because it could be located on a symlinked directory.  This
     ;; would let the test fail.
-    (let* ((tramp-test-temporary-file-directory
-	    (file-truename tramp-test-temporary-file-directory))
+    (let* ((ert-remote-temporary-file-directory
+	    (file-truename ert-remote-temporary-file-directory))
 	   (tmp-name1 (tramp--test-make-temp-name nil quoted))
 	   (tmp-name2 (tramp--test-make-temp-name nil quoted))
 	   ;; File name with "//".
@@ -3448,7 +3451,7 @@ This tests also `access-file', `file-readable-p',
 		(and test-file-ownership-preserved-p
 		     (zerop (logand
 			     #o1000
-			     (file-modes tramp-test-temporary-file-directory))))
+			     (file-modes ert-remote-temporary-file-directory))))
 	      (write-region "foo" nil tmp-name1)
 	      (setq test-file-ownership-preserved-p
 		    (= (file-attribute-group-id (file-attributes tmp-name1))
@@ -3527,7 +3530,7 @@ This tests also `access-file', `file-readable-p',
 
 	    ;; Check, that "//" in symlinks are handled properly.
 	    (with-temp-buffer
-	      (let ((default-directory tramp-test-temporary-file-directory))
+	      (let ((default-directory ert-remote-temporary-file-directory))
 		(shell-command
 		 (format
 		  "ln -s %s %s"
@@ -3785,8 +3788,8 @@ This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
     ;; We must use `file-truename' for the temporary directory,
     ;; because it could be located on a symlinked directory.  This
     ;; would let the test fail.
-    (let* ((tramp-test-temporary-file-directory
-	    (file-truename tramp-test-temporary-file-directory))
+    (let* ((ert-remote-temporary-file-directory
+	    (file-truename ert-remote-temporary-file-directory))
 	   (tmp-name1 (tramp--test-make-temp-name nil quoted))
 	   (tmp-name2 (tramp--test-make-temp-name nil quoted))
 	   (tmp-name3 (tramp--test-make-temp-name 'local quoted))
@@ -3933,7 +3936,7 @@ This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
 	    (should (file-equal-p tmp-name1 tmp-name2))
 	    ;; Check relative symlink file name.
 	    (delete-file tmp-name2)
-	    (let ((default-directory tramp-test-temporary-file-directory))
+	    (let ((default-directory ert-remote-temporary-file-directory))
 	      (make-symbolic-link (file-name-nondirectory tmp-name1) tmp-name2))
 	    (should (file-symlink-p tmp-name2))
 	    (should-not (string-equal tmp-name2 (file-truename tmp-name2)))
@@ -3980,7 +3983,7 @@ This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
 	  (tramp--test-ignore-make-symbolic-link-error
 	    (make-directory tmp-name1)
 	    (should (file-directory-p tmp-name1))
-	    (let* ((tramp-test-temporary-file-directory
+	    (let* ((ert-remote-temporary-file-directory
 		    (file-truename tmp-name1))
 		   (tmp-name2 (tramp--test-make-temp-name nil quoted))
 		   (tmp-name3 tmp-name2)
@@ -4041,7 +4044,7 @@ This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
 	      (directory-file-name
 	       (funcall
 		(if quoted #'tramp-compat-file-name-quote #'identity)
-		tramp-test-temporary-file-directory)))
+		ert-remote-temporary-file-directory)))
 	     (dir2 (file-name-as-directory dir1)))
 	(should (string-equal (file-truename dir1) (expand-file-name dir1)))
 	(should (string-equal (file-truename dir2) (expand-file-name dir2)))))))
@@ -4131,7 +4134,7 @@ This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
   "Check that `file-acl' and `set-file-acl' work proper."
   (skip-unless (tramp--test-enabled))
   ;; The following test checks also whether `set-file-modes' will work.
-  (skip-unless (file-acl tramp-test-temporary-file-directory))
+  (skip-unless (file-acl ert-remote-temporary-file-directory))
   (skip-unless (not (tramp--test-crypt-p)))
 
   ;; `filename-non-special' has been fixed in Emacs 27.1, see Bug#29579.
@@ -4210,7 +4213,7 @@ This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
   "Check `file-selinux-context' and `set-file-selinux-context'."
   (skip-unless (tramp--test-enabled))
   (skip-unless
-   (not (equal (file-selinux-context tramp-test-temporary-file-directory)
+   (not (equal (file-selinux-context ert-remote-temporary-file-directory)
 	       '(nil nil nil nil))))
   (skip-unless (not (tramp--test-crypt-p)))
 
@@ -4271,7 +4274,7 @@ This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
 		      (let ((default-directory temporary-file-directory))
 			(shell-command-to-string "id -Z"))
 		      (let ((default-directory
-			      tramp-test-temporary-file-directory))
+			      ert-remote-temporary-file-directory))
 			(shell-command-to-string "id -Z"))))
 
 	    ;; Two files with same SELinux context.
@@ -4356,8 +4359,8 @@ This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
   ;; does not work on MS Windows.
   (unless (memq system-type '(cygwin windows-nt))
     (let ((tramp-fuse-remove-hidden-files t)
-	  (method (file-remote-p tramp-test-temporary-file-directory 'method))
-	  (host (file-remote-p tramp-test-temporary-file-directory 'host))
+	  (method (file-remote-p ert-remote-temporary-file-directory 'method))
+	  (host (file-remote-p ert-remote-temporary-file-directory 'host))
           (orig-syntax tramp-syntax))
       (when (and (stringp host) (string-match tramp-host-with-port-regexp host))
 	(setq host (match-string 1 host)))
@@ -4509,7 +4512,7 @@ This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
   (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
     (let* ((tmp-name (tramp--test-make-temp-name nil quoted))
 	   (fnnd (file-name-nondirectory tmp-name))
-	   (default-directory tramp-test-temporary-file-directory)
+	   (default-directory ert-remote-temporary-file-directory)
 	   (buffer (get-buffer-create "*tramp-tests*"))
 	   kill-buffer-query-functions)
       (unwind-protect
@@ -4643,7 +4646,7 @@ This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
   (skip-unless (tramp--test-supports-processes-p))
 
   (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
-    (let ((default-directory tramp-test-temporary-file-directory)
+    (let ((default-directory ert-remote-temporary-file-directory)
 	  (tmp-name (tramp--test-make-temp-name nil quoted))
 	  kill-buffer-query-functions command proc)
 
@@ -4809,7 +4812,7 @@ If UNSTABLE is non-nil, the test is tagged as `:unstable'."
        :tags (append '(:expensive-test :tramp-asynchronous-processes)
 		     (and ,unstable '(:unstable)))
        (skip-unless (tramp--test-enabled))
-       (let ((default-directory tramp-test-temporary-file-directory)
+       (let ((default-directory ert-remote-temporary-file-directory)
 	     (ert-test (ert-get-test ',test))
 	     (tramp-connection-properties
 	      (cons '(nil "direct-async-process" t)
@@ -4822,7 +4825,7 @@ If UNSTABLE is non-nil, the test is tagged as `:unstable'."
 	 (cl-letf (((symbol-function #'tramp--test-enabled) #'tramp--test-always)
 		   ((symbol-function #'internal-default-process-sentinel)
 		    #'ignore))
-	   (file-truename tramp-test-temporary-file-directory)
+	   (file-truename ert-remote-temporary-file-directory)
 	   (funcall (ert-test-body ert-test)))))))
 
 (tramp--test--deftest-direct-async-process tramp-test29-start-file-process
@@ -4839,7 +4842,7 @@ If UNSTABLE is non-nil, the test is tagged as `:unstable'."
   (skip-unless (tramp--test-emacs27-p))
 
   (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
-    (let ((default-directory tramp-test-temporary-file-directory)
+    (let ((default-directory ert-remote-temporary-file-directory)
 	  (tmp-name (tramp--test-make-temp-name nil quoted))
 	  kill-buffer-query-functions command proc)
       (with-no-warnings (should-not (make-process)))
@@ -5100,7 +5103,7 @@ If UNSTABLE is non-nil, the test is tagged as `:unstable'."
   ;; We must use `file-truename' for the temporary directory, in
   ;; order to establish the connection prior running an asynchronous
   ;; process.
-  (let ((default-directory (file-truename tramp-test-temporary-file-directory))
+  (let ((default-directory (file-truename ert-remote-temporary-file-directory))
 	(delete-exited-processes t)
 	kill-buffer-query-functions command proc)
     (unwind-protect
@@ -5145,7 +5148,7 @@ If UNSTABLE is non-nil, the test is tagged as `:unstable'."
   ;; We must use `file-truename' for the temporary directory, in
   ;; order to establish the connection prior running an asynchronous
   ;; process.
-  (let ((default-directory (file-truename tramp-test-temporary-file-directory))
+  (let ((default-directory (file-truename ert-remote-temporary-file-directory))
 	(delete-exited-processes t)
 	kill-buffer-query-functions command proc)
 
@@ -5207,7 +5210,7 @@ If UNSTABLE is non-nil, the test is tagged as `:unstable'."
   ;; `list-system-processes' is supported since Emacs 29.1.
   (skip-unless (tramp--test-emacs29-p))
 
-  (let ((default-directory tramp-test-temporary-file-directory))
+  (let ((default-directory ert-remote-temporary-file-directory))
     (skip-unless (consp (list-system-processes)))
     (should (not (equal (list-system-processes)
 			(let ((default-directory temporary-file-directory))
@@ -5224,7 +5227,7 @@ If UNSTABLE is non-nil, the test is tagged as `:unstable'."
   ;; We must use `file-truename' for the temporary directory, in
   ;; order to establish the connection prior running an asynchronous
   ;; process.
-  (let ((default-directory (file-truename tramp-test-temporary-file-directory))
+  (let ((default-directory (file-truename ert-remote-temporary-file-directory))
 	(delete-exited-processes t)
 	kill-buffer-query-functions command proc)
     (skip-unless (consp (list-system-processes)))
@@ -5282,7 +5285,7 @@ INPUT, if non-nil, is a string sent to the process."
 
   (dolist (quoted (if (tramp--test-expensive-test-p) '(nil t) '(nil)))
     (let ((tmp-name (tramp--test-make-temp-name nil quoted))
-	  (default-directory tramp-test-temporary-file-directory)
+	  (default-directory ert-remote-temporary-file-directory)
 	  ;; Suppress nasty messages.
 	  (inhibit-message t)
 	  kill-buffer-query-functions)
@@ -5363,7 +5366,7 @@ INPUT, if non-nil, is a string sent to the process."
   (when (and (tramp--test-asynchronous-processes-p)
 	     (tramp--test-sh-p) (tramp--test-emacs27-p))
     (let* ((async-shell-command-width 1024)
-	   (default-directory tramp-test-temporary-file-directory)
+	   (default-directory ert-remote-temporary-file-directory)
 	   (cols (ignore-errors
 		   (read (tramp--test-shell-command-to-string-asynchronously
 			  "tput cols")))))
@@ -5415,7 +5418,7 @@ INPUT, if non-nil, is a string sent to the process."
     ;; We check both the local and remote case, in order to guarantee
     ;; that they behave similar.
     (dolist (default-directory
-	      `(,temporary-file-directory ,tramp-test-temporary-file-directory))
+	      `(,temporary-file-directory ,ert-remote-temporary-file-directory))
       ;; These are the possible values of `shell-command-dont-erase-buffer'.
       ;; `random' is taken as non-nil value without special meaning.
       (dolist (shell-command-dont-erase-buffer
@@ -5515,7 +5518,7 @@ INPUT, if non-nil, is a string sent to the process."
 	    (and (tramp--test-asynchronous-processes-p)
 		 '(tramp--test-shell-command-to-string-asynchronously))))
 
-    (let ((default-directory tramp-test-temporary-file-directory)
+    (let ((default-directory ert-remote-temporary-file-directory)
 	  (shell-file-name "/bin/sh")
 	  (envvar (concat "VAR_" (upcase (md5 (current-time-string)))))
 	  kill-buffer-query-functions)
@@ -5606,7 +5609,7 @@ Use direct async.")
   (skip-unless (not (tramp--test-crypt-p)))
 
   ;; We force a reconnect, in order to have a clean environment.
-  (dolist (dir `(,tramp-test-temporary-file-directory
+  (dolist (dir `(,ert-remote-temporary-file-directory
 		 "/mock:localhost#11111:" "/mock:localhost#22222:"))
     (tramp-cleanup-connection
      (tramp-dissect-file-name dir) 'keep-debug 'keep-password))
@@ -5640,7 +5643,7 @@ Use direct async.")
   ;; Since Emacs 27.1.
   (skip-unless (macrop 'with-connection-local-variables))
 
-  (let* ((default-directory tramp-test-temporary-file-directory)
+  (let* ((default-directory ert-remote-temporary-file-directory)
 	 (tmp-name1 (tramp--test-make-temp-name))
 	 (tmp-name2 (expand-file-name "foo" tmp-name1))
 	 (enable-local-variables :all)
@@ -5707,7 +5710,7 @@ Use direct async.")
   (when (tramp--test-adb-p)
     (skip-unless (tramp--test-emacs27-p)))
 
-  (let ((default-directory tramp-test-temporary-file-directory)
+  (let ((default-directory ert-remote-temporary-file-directory)
 	explicit-shell-file-name kill-buffer-query-functions
 	connection-local-profile-alist connection-local-criteria-alist)
     (unwind-protect
@@ -5757,7 +5760,7 @@ Use direct async.")
   (skip-unless (fboundp 'exec-path))
 
   (let ((tmp-name (tramp--test-make-temp-name))
-	(default-directory tramp-test-temporary-file-directory))
+	(default-directory ert-remote-temporary-file-directory))
     (unwind-protect
 	(progn
 	  (should (consp (with-no-warnings (exec-path))))
@@ -5802,7 +5805,7 @@ Use direct async.")
   (skip-unless (fboundp 'exec-path))
 
   (let* ((tmp-name (tramp--test-make-temp-name))
-	 (default-directory tramp-test-temporary-file-directory)
+	 (default-directory ert-remote-temporary-file-directory)
          (orig-exec-path (with-no-warnings (exec-path)))
          (tramp-remote-path tramp-remote-path)
 	 (orig-tramp-remote-path tramp-remote-path)
@@ -5869,7 +5872,7 @@ Use direct async.")
     ;; order to establish the connection prior running an asynchronous
     ;; process.
     (let* ((default-directory
-	     (file-truename tramp-test-temporary-file-directory))
+	     (file-truename ert-remote-temporary-file-directory))
 	   (tmp-name1 (tramp--test-make-temp-name nil quoted))
 	   (tmp-name2 (expand-file-name "foo" tmp-name1))
 	   (tramp-remote-process-environment tramp-remote-process-environment)
@@ -5973,7 +5976,7 @@ Use direct async.")
 		   (if quoted #'tramp-compat-file-name-quote #'identity)
 		   (expand-file-name
 		    (format "#%s#" (file-name-nondirectory tmp-name1))
-		    tramp-test-temporary-file-directory))))))
+		    ert-remote-temporary-file-directory))))))
 
 	    ;; Use default `tramp-auto-save-directory' mechanism.
 	    ;; Ange-FTP doesn't care.
@@ -6078,7 +6081,7 @@ Use direct async.")
 		(if quoted #'tramp-compat-file-name-quote #'identity)
 		(expand-file-name
 		 (format "%s~" (file-name-nondirectory tmp-name1))
-		 tramp-test-temporary-file-directory)))))))
+		 ert-remote-temporary-file-directory)))))))
 
       (unwind-protect
 	  ;; Map `backup-directory-alist'.
@@ -6411,7 +6414,7 @@ Use direct async.")
   (skip-unless (tramp--test-enabled))
   (skip-unless (not (tramp--test-ange-ftp-p)))
 
-  (let ((default-directory tramp-test-temporary-file-directory)
+  (let ((default-directory ert-remote-temporary-file-directory)
 	tmp-file)
     ;; The remote host shall know a temporary file directory.
     (should (stringp (temporary-file-directory)))
@@ -6458,7 +6461,7 @@ variables, so we check the Emacs version directly."
 (defun tramp--test-adb-p ()
   "Check, whether the remote host runs Android.
 This requires restrictions of file name syntax."
-  (tramp-adb-file-name-p tramp-test-temporary-file-directory))
+  (tramp-adb-file-name-p ert-remote-temporary-file-directory))
 
 (defun tramp--test-ange-ftp-p ()
   "Check, whether Ange-FTP is used."
@@ -6481,13 +6484,13 @@ This is used in tests which we don't want to tag
 
 (defun tramp--test-crypt-p ()
   "Check, whether the remote directory is crypted."
-  (tramp-crypt-file-name-p tramp-test-temporary-file-directory))
+  (tramp-crypt-file-name-p ert-remote-temporary-file-directory))
 
 (defun tramp--test-docker-p ()
   "Check, whether the docker method is used.
 This does not support some special file names."
   (string-equal
-   "docker" (file-remote-p tramp-test-temporary-file-directory 'method)))
+   "docker" (file-remote-p ert-remote-temporary-file-directory 'method)))
 
 (defun tramp--test-expensive-test-p ()
   "Whether expensive tests are run.
@@ -6503,7 +6506,7 @@ completely."
 This does not support globbing characters in file names (yet)."
   ;; Globbing characters are ??, ?* and ?\[.
   (string-match-p
-   "ftp$" (file-remote-p tramp-test-temporary-file-directory 'method)))
+   "ftp$" (file-remote-p ert-remote-temporary-file-directory 'method)))
 
 (defun tramp--test-fuse-p ()
   "Check, whether an FUSE file system isused."
@@ -6512,20 +6515,20 @@ This does not support globbing characters in file names (yet)."
 (defun tramp--test-gdrive-p ()
   "Check, whether the gdrive method is used."
   (string-equal
-   "gdrive" (file-remote-p tramp-test-temporary-file-directory 'method)))
+   "gdrive" (file-remote-p ert-remote-temporary-file-directory 'method)))
 
 (defun tramp--test-gvfs-p (&optional method)
   "Check, whether the remote host runs a GVFS based method.
 This requires restrictions of file name syntax.
 If optional METHOD is given, it is checked first."
   (or (member method tramp-gvfs-methods)
-      (tramp-gvfs-file-name-p tramp-test-temporary-file-directory)))
+      (tramp-gvfs-file-name-p ert-remote-temporary-file-directory)))
 
 (defun tramp--test-hpux-p ()
   "Check, whether the remote host runs HP-UX.
 Several special characters do not work properly there."
   ;; We must refill the cache.  `file-truename' does it.
-  (file-truename tramp-test-temporary-file-directory)
+  (file-truename ert-remote-temporary-file-directory)
   (ignore-errors (tramp-check-remote-uname tramp-test-vec "^HP-UX")))
 
 (defun tramp--test-ksh-p ()
@@ -6533,21 +6536,21 @@ Several special characters do not work properly there."
 ksh93 makes some strange conversions of non-latin characters into
 a $'' syntax."
   ;; We must refill the cache.  `file-truename' does it.
-  (file-truename tramp-test-temporary-file-directory)
+  (file-truename ert-remote-temporary-file-directory)
   (string-match-p
    "ksh$" (tramp-get-connection-property tramp-test-vec "remote-shell" "")))
 
 (defun tramp--test-macos-p ()
   "Check, whether the remote host runs macOS."
   ;; We must refill the cache.  `file-truename' does it.
-  (file-truename tramp-test-temporary-file-directory)
+  (file-truename ert-remote-temporary-file-directory)
   (ignore-errors (tramp-check-remote-uname tramp-test-vec "Darwin")))
 
 (defun tramp--test-mock-p ()
   "Check, whether the mock method is used.
 This does not support external Emacs calls."
   (string-equal
-   "mock" (file-remote-p tramp-test-temporary-file-directory 'method)))
+   "mock" (file-remote-p ert-remote-temporary-file-directory 'method)))
 
 (defun tramp--test-out-of-band-p ()
   "Check, whether an out-of-band method is used."
@@ -6556,13 +6559,13 @@ This does not support external Emacs calls."
 (defun tramp--test-rclone-p ()
   "Check, whether the remote host is offered by rclone.
 This requires restrictions of file name syntax."
-  (tramp-rclone-file-name-p tramp-test-temporary-file-directory))
+  (tramp-rclone-file-name-p ert-remote-temporary-file-directory))
 
 (defun tramp--test-rsync-p ()
   "Check, whether the rsync method is used.
 This does not support special file names."
   (string-equal
-   "rsync" (file-remote-p tramp-test-temporary-file-directory 'method)))
+   "rsync" (file-remote-p ert-remote-temporary-file-directory 'method)))
 
 (defun tramp--test-sh-p ()
   "Check, whether the remote host runs a based method from tramp-sh.el."
@@ -6576,7 +6579,7 @@ Additionally, ls does not support \"--dired\"."
 	 ;; We must refill the cache.  `insert-directory' does it.
 	 ;; This fails for tramp-crypt.el, so we ignore that.
 	 (ignore-errors
-	   (insert-directory tramp-test-temporary-file-directory "-al"))
+	   (insert-directory ert-remote-temporary-file-directory "-al"))
 	 (not (tramp-get-connection-property tramp-test-vec "ls--dired" nil)))))
 
 (defun tramp--test-share-p ()
@@ -6584,22 +6587,22 @@ Additionally, ls does not support \"--dired\"."
   (and (tramp--test-gvfs-p)
        (string-match-p
 	"^\\(afp\\|davs?\\|smb\\)$"
-	(file-remote-p tramp-test-temporary-file-directory 'method))))
+	(file-remote-p ert-remote-temporary-file-directory 'method))))
 
 (defun tramp--test-sshfs-p ()
   "Check, whether the remote host is offered by sshfs.
 This requires restrictions of file name syntax."
-  (tramp-sshfs-file-name-p tramp-test-temporary-file-directory))
+  (tramp-sshfs-file-name-p ert-remote-temporary-file-directory))
 
 (defun tramp--test-sudoedit-p ()
   "Check, whether the sudoedit method is used."
-  (tramp-sudoedit-file-name-p tramp-test-temporary-file-directory))
+  (tramp-sudoedit-file-name-p ert-remote-temporary-file-directory))
 
 (defun tramp--test-telnet-p ()
   "Check, whether the telnet method is used.
 This does not support special file names."
   (string-equal
-   "telnet" (file-remote-p tramp-test-temporary-file-directory 'method)))
+   "telnet" (file-remote-p ert-remote-temporary-file-directory 'method)))
 
 (defun tramp--test-windows-nt-p ()
   "Check, whether the locale host runs MS Windows."
@@ -6620,7 +6623,7 @@ This requires restrictions of file name syntax."
 (defun tramp--test-smb-p ()
   "Check, whether the locale or remote host runs MS Windows.
 This requires restrictions of file name syntax."
-  (tramp-smb-file-name-p tramp-test-temporary-file-directory))
+  (tramp-smb-file-name-p ert-remote-temporary-file-directory))
 
 (defun tramp--test-supports-processes-p ()
   "Return whether the method under test supports external processes."
@@ -6636,7 +6639,7 @@ This requires restrictions of file name syntax."
       (and
        (tramp--test-gvfs-p)
        (string-match-p
-	"ftp" (file-remote-p tramp-test-temporary-file-directory 'method)))))
+	"ftp" (file-remote-p ert-remote-temporary-file-directory 'method)))))
 
 (defun tramp--test-check-files (&rest files)
   "Run a simple but comprehensive test over every file in FILES."
@@ -6647,8 +6650,8 @@ This requires restrictions of file name syntax."
     ;; We must use `file-truename' for the temporary directory,
     ;; because it could be located on a symlinked directory.  This
     ;; would let the test fail.
-    (let* ((tramp-test-temporary-file-directory
-	    (file-truename tramp-test-temporary-file-directory))
+    (let* ((ert-remote-temporary-file-directory
+	    (file-truename ert-remote-temporary-file-directory))
 	   (tramp-fuse-remove-hidden-files t)
 	   (tmp-name1 (tramp--test-make-temp-name nil quoted))
 	   (tmp-name2 (tramp--test-make-temp-name 'local quoted))
@@ -6835,7 +6838,7 @@ This requires restrictions of file name syntax."
 	      (dolist (elt files)
 		(let ((envvar (concat "VAR_" (upcase (md5 elt))))
 		      (elt (encode-coding-string elt coding-system-for-read))
-		      (default-directory tramp-test-temporary-file-directory)
+		      (default-directory ert-remote-temporary-file-directory)
 		      (process-environment process-environment))
 		  (setenv envvar elt)
 		  ;; The value of PS1 could confuse Tramp's detection
@@ -6933,12 +6936,12 @@ Use the \"stat\" command."
   (skip-unless (tramp--test-sh-p))
   (skip-unless (not (tramp--test-rsync-p)))
   ;; We cannot use `tramp-test-vec', because this fails during compilation.
-  (with-parsed-tramp-file-name tramp-test-temporary-file-directory nil
+  (with-parsed-tramp-file-name ert-remote-temporary-file-directory nil
     (skip-unless (tramp-get-remote-stat v)))
 
   (let ((tramp-connection-properties
 	 (append
-	  `((,(regexp-quote (file-remote-p tramp-test-temporary-file-directory))
+	  `((,(regexp-quote (file-remote-p ert-remote-temporary-file-directory))
 	     "perl" nil))
 	  tramp-connection-properties)))
     (tramp--test-special-characters)))
@@ -6952,15 +6955,15 @@ Use the \"perl\" command."
   (skip-unless (tramp--test-sh-p))
   (skip-unless (not (tramp--test-rsync-p)))
   ;; We cannot use `tramp-test-vec', because this fails during compilation.
-  (with-parsed-tramp-file-name tramp-test-temporary-file-directory nil
+  (with-parsed-tramp-file-name ert-remote-temporary-file-directory nil
     (skip-unless (tramp-get-remote-perl v)))
 
   (let ((tramp-connection-properties
 	 (append
-	  `((,(regexp-quote (file-remote-p tramp-test-temporary-file-directory))
+	  `((,(regexp-quote (file-remote-p ert-remote-temporary-file-directory))
 	     "stat" nil)
 	    ;; See `tramp-sh-handle-file-truename'.
-	    (,(regexp-quote (file-remote-p tramp-test-temporary-file-directory))
+	    (,(regexp-quote (file-remote-p ert-remote-temporary-file-directory))
 	     "readlink" nil))
 	  tramp-connection-properties)))
     (tramp--test-special-characters)))
@@ -6976,12 +6979,12 @@ Use the \"ls\" command."
 
   (let ((tramp-connection-properties
 	 (append
-	  `((,(regexp-quote (file-remote-p tramp-test-temporary-file-directory))
+	  `((,(regexp-quote (file-remote-p ert-remote-temporary-file-directory))
 	     "perl" nil)
-	    (,(regexp-quote (file-remote-p tramp-test-temporary-file-directory))
+	    (,(regexp-quote (file-remote-p ert-remote-temporary-file-directory))
 	     "stat" nil)
 	    ;; See `tramp-sh-handle-file-truename'.
-	    (,(regexp-quote (file-remote-p tramp-test-temporary-file-directory))
+	    (,(regexp-quote (file-remote-p ert-remote-temporary-file-directory))
 	     "readlink" nil))
 	  tramp-connection-properties)))
     (tramp--test-special-characters)))
@@ -7060,12 +7063,12 @@ Use the \"stat\" command."
   (skip-unless (not (tramp--test-ksh-p)))
   (skip-unless (not (tramp--test-crypt-p)))
   ;; We cannot use `tramp-test-vec', because this fails during compilation.
-  (with-parsed-tramp-file-name tramp-test-temporary-file-directory nil
+  (with-parsed-tramp-file-name ert-remote-temporary-file-directory nil
     (skip-unless (tramp-get-remote-stat v)))
 
   (let ((tramp-connection-properties
 	 (append
-	  `((,(regexp-quote (file-remote-p tramp-test-temporary-file-directory))
+	  `((,(regexp-quote (file-remote-p ert-remote-temporary-file-directory))
 	     "perl" nil))
 	  tramp-connection-properties)))
     (tramp--test-utf8)))
@@ -7083,15 +7086,15 @@ Use the \"perl\" command."
   (skip-unless (not (tramp--test-ksh-p)))
   (skip-unless (not (tramp--test-crypt-p)))
   ;; We cannot use `tramp-test-vec', because this fails during compilation.
-  (with-parsed-tramp-file-name tramp-test-temporary-file-directory nil
+  (with-parsed-tramp-file-name ert-remote-temporary-file-directory nil
     (skip-unless (tramp-get-remote-perl v)))
 
   (let ((tramp-connection-properties
 	 (append
-	  `((,(regexp-quote (file-remote-p tramp-test-temporary-file-directory))
+	  `((,(regexp-quote (file-remote-p ert-remote-temporary-file-directory))
 	     "stat" nil)
 	    ;; See `tramp-sh-handle-file-truename'.
-	    (,(regexp-quote (file-remote-p tramp-test-temporary-file-directory))
+	    (,(regexp-quote (file-remote-p ert-remote-temporary-file-directory))
 	     "readlink" nil))
 	  tramp-connection-properties)))
     (tramp--test-utf8)))
@@ -7111,12 +7114,12 @@ Use the \"ls\" command."
 
   (let ((tramp-connection-properties
 	 (append
-	  `((,(regexp-quote (file-remote-p tramp-test-temporary-file-directory))
+	  `((,(regexp-quote (file-remote-p ert-remote-temporary-file-directory))
 	     "perl" nil)
-	    (,(regexp-quote (file-remote-p tramp-test-temporary-file-directory))
+	    (,(regexp-quote (file-remote-p ert-remote-temporary-file-directory))
 	     "stat" nil)
 	    ;; See `tramp-sh-handle-file-truename'.
-	    (,(regexp-quote (file-remote-p tramp-test-temporary-file-directory))
+	    (,(regexp-quote (file-remote-p ert-remote-temporary-file-directory))
 	     "readlink" nil))
 	  tramp-connection-properties)))
     (tramp--test-utf8)))
@@ -7130,7 +7133,7 @@ Use the \"ls\" command."
   ;; `file-system-info' exists since Emacs 27.1.  We don't want to see
   ;; compiler warnings for older Emacsen.
   (when-let ((fsi (with-no-warnings
-		    (file-system-info tramp-test-temporary-file-directory))))
+		    (file-system-info ert-remote-temporary-file-directory))))
     (should (consp fsi))
     (should (= (length fsi) 3))
     (dotimes (i (length fsi))
@@ -7385,7 +7388,7 @@ process sentinels.  They shall not disturb each other."
   ;; default handler.
   (skip-unless (not (tramp--test-emacs29-p)))
 
-  (let ((default-directory tramp-test-temporary-file-directory)
+  (let ((default-directory ert-remote-temporary-file-directory)
         (tmp-name (tramp--test-make-temp-name)))
     (write-region "foo" nil tmp-name)
     (dired default-directory)
@@ -7406,7 +7409,7 @@ process sentinels.  They shall not disturb each other."
   ;; default handler.
   (skip-unless (not (tramp--test-emacs29-p)))
 
-  (let ((default-directory tramp-test-temporary-file-directory)
+  (let ((default-directory ert-remote-temporary-file-directory)
         (tmp-name (tramp--test-make-temp-name)))
     (make-directory tmp-name)
     (dired default-directory)
@@ -7451,17 +7454,17 @@ process sentinels.  They shall not disturb each other."
       (tramp-cleanup-connection tramp-test-vec 'keep-debug)
       ;; We don't want to invalidate the password.
       (setq mocked-input `(,(copy-sequence pass)))
-      (should (file-exists-p tramp-test-temporary-file-directory))
+      (should (file-exists-p ert-remote-temporary-file-directory))
 
       ;; Don't entering a password returns in error.
       (tramp-cleanup-connection tramp-test-vec 'keep-debug)
       (setq mocked-input nil)
-      (should-error (file-exists-p tramp-test-temporary-file-directory))
+      (should-error (file-exists-p ert-remote-temporary-file-directory))
 
       ;; A wrong password doesn't work either.
       (tramp-cleanup-connection tramp-test-vec 'keep-debug)
       (setq mocked-input `(,(concat pass pass)))
-      (should-error (file-exists-p tramp-test-temporary-file-directory))
+      (should-error (file-exists-p ert-remote-temporary-file-directory))
 
       ;; Reading password from auth-source works.  We use the netrc
       ;; backend; the other backends shall behave similar.
@@ -7474,9 +7477,9 @@ process sentinels.  They shall not disturb each other."
 	  :prefix "tramp-test" :suffix ""
 	  :text (format
 		 "machine %s port mock password %s"
-		 (file-remote-p tramp-test-temporary-file-directory 'host) pass)
+		 (file-remote-p ert-remote-temporary-file-directory 'host) pass)
 	  (let ((auth-sources `(,netrc-file)))
-	    (should (file-exists-p tramp-test-temporary-file-directory)))))))))
+	    (should (file-exists-p ert-remote-temporary-file-directory)))))))))
 
 ;; This test is inspired by Bug#29163.
 (ert-deftest tramp-test47-auto-load ()
@@ -7492,7 +7495,7 @@ process sentinels.  They shall not disturb each other."
 	  ;; Suppress method name check.
 	  "(let ((non-essential t)) \
              (message \"Tramp loaded: %%s\" (and (file-remote-p %S) t)))"
-	  tramp-test-temporary-file-directory)))
+	  ert-remote-temporary-file-directory)))
     (should
      (string-match-p
       "Tramp loaded: t[\n\r]+"
@@ -7541,10 +7544,10 @@ process sentinels.  They shall not disturb each other."
     (dolist (code
 	     (list
 	      (format
-	       "(expand-file-name %S)" tramp-test-temporary-file-directory)
+	       "(expand-file-name %S)" ert-remote-temporary-file-directory)
 	      (format
 	       "(let ((default-directory %S)) (expand-file-name %S))"
-	       tramp-test-temporary-file-directory
+	       ert-remote-temporary-file-directory
 	       temporary-file-directory)))
       (should-not
        (string-match-p
diff --git a/test/lisp/shadowfile-tests.el b/test/lisp/shadowfile-tests.el
index 46ab34535d4..e822bc9eb66 100644
--- a/test/lisp/shadowfile-tests.el
+++ b/test/lisp/shadowfile-tests.el
@@ -37,37 +37,9 @@
 
 ;;; Code:
 
-(require 'ert)
-(require 'shadowfile)
 (require 'tramp)
-
-;; There is no default value on w32 systems, which could work out of the box.
-(defconst shadow-test-remote-temporary-file-directory
-  (cond
-   ((getenv "REMOTE_TEMPORARY_FILE_DIRECTORY"))
-   ((eq system-type 'windows-nt) null-device)
-   (t (add-to-list
-       'tramp-methods
-       '("mock"
-	 (tramp-login-program        "sh")
-	 (tramp-login-args           (("-i")))
-	 (tramp-remote-shell         "/bin/sh")
-	 (tramp-remote-shell-args    ("-c"))
-	 (tramp-connection-timeout   10)))
-      (add-to-list
-       'tramp-default-host-alist
-       `("\\`mock\\'" nil ,(system-name)))
-      ;; Emacs' Makefile sets $HOME to a nonexistent value.  Needed in
-      ;; batch mode only, therefore.  `shadow-homedir' cannot be
-      ;; `temporary-directory', because the tests with "~" would fail.
-      (unless (and (null noninteractive) (file-directory-p "~/"))
-        (setenv "HOME" (file-name-unquote temporary-file-directory))
-        (setq shadow-homedir invocation-directory)
-        (add-to-list
-         'tramp-connection-properties
-         `(,(file-remote-p "/mock::") "~" ,invocation-directory)))
-      (format "/mock::%s" temporary-file-directory)))
-  "Temporary directory for Tramp tests.")
+(require 'ert-x)
+(require 'shadowfile)
 
 (setq auth-source-save-behavior nil
       password-cache-expiry nil
@@ -80,9 +52,8 @@
       tramp-verbose 0
       ;; On macOS, `temporary-file-directory' is a symlinked directory.
       temporary-file-directory (file-truename temporary-file-directory)
-      shadow-test-remote-temporary-file-directory
-      (ignore-errors
-        (file-truename shadow-test-remote-temporary-file-directory)))
+      ert-remote-temporary-file-directory
+      (ignore-errors (file-truename ert-remote-temporary-file-directory)))
 
 ;; This should happen on hydra only.
 (when (getenv "EMACS_HYDRA_CI")
@@ -100,7 +71,7 @@
   "Reset all `shadowfile' internals."
   ;; Cleanup Tramp.
   (tramp-cleanup-connection
-   (tramp-dissect-file-name shadow-test-remote-temporary-file-directory) t t)
+   (tramp-dissect-file-name ert-remote-temporary-file-directory) t t)
   ;; Delete auto-saved files.
   (with-current-buffer (find-file-noselect shadow-info-file 'nowarn)
     (ignore-errors (delete-file (make-auto-save-file-name)))
@@ -135,7 +106,7 @@ a cluster (or site).  This is not tested here; it must be
 guaranteed by the originator of a cluster definition."
   :tags '(:expensive-test)
   (skip-unless (not (memq system-type '(windows-nt ms-dos))))
-  (skip-unless (file-remote-p shadow-test-remote-temporary-file-directory))
+  (skip-unless (file-remote-p ert-remote-temporary-file-directory))
 
   (let ((text-quoting-style 'grave) ;; We inspect the *Messages* buffer!
         (inhibit-message t)
@@ -222,8 +193,7 @@ guaranteed by the originator of a cluster definition."
 	    (shadow-cluster-regexp (shadow-get-cluster cluster)) regexp))
 
 	  ;; Redefine the cluster.
-	  (setq primary
-		(file-remote-p shadow-test-remote-temporary-file-directory)
+	  (setq primary (file-remote-p ert-remote-temporary-file-directory)
 		regexp (shadow-regexp-superquote primary)
 		mocked-input `(,cluster ,primary ,regexp))
 	  (call-interactively #'shadow-define-cluster)
@@ -254,7 +224,7 @@ Per definition, all files are identical on the different hosts of
 a cluster (or site).  This is not tested here; it must be
 guaranteed by the originator of a cluster definition."
   (skip-unless (not (memq system-type '(windows-nt ms-dos))))
-  (skip-unless (file-remote-p shadow-test-remote-temporary-file-directory))
+  (skip-unless (file-remote-p ert-remote-temporary-file-directory))
 
   (let ((shadow-info-file shadow-test-info-file)
 	(shadow-todo-file shadow-test-todo-file)
@@ -286,14 +256,14 @@ guaranteed by the originator of a cluster definition."
           (should (string-equal (system-name) (shadow-site-name primary1)))
           (should
            (string-equal
-            (file-remote-p shadow-test-remote-temporary-file-directory)
+            (file-remote-p ert-remote-temporary-file-directory)
             (shadow-name-site
-             (file-remote-p shadow-test-remote-temporary-file-directory))))
+             (file-remote-p ert-remote-temporary-file-directory))))
           (should
            (string-equal
-            (file-remote-p shadow-test-remote-temporary-file-directory)
+            (file-remote-p ert-remote-temporary-file-directory)
             (shadow-site-name
-             (file-remote-p shadow-test-remote-temporary-file-directory))))
+             (file-remote-p ert-remote-temporary-file-directory))))
 
           (should (equal (shadow-site-cluster cluster1)
 			 (shadow-get-cluster cluster1)))
@@ -324,8 +294,7 @@ guaranteed by the originator of a cluster definition."
 
 	  ;; Define a second cluster.
           (setq cluster2 "cluster2"
-		primary2
-		(file-remote-p shadow-test-remote-temporary-file-directory)
+		primary2 (file-remote-p ert-remote-temporary-file-directory)
 		regexp2 (format "^\\(%s\\|%s\\)$" shadow-system-name primary2))
 	  (shadow-set-cluster cluster2 primary2 regexp2)
 
@@ -356,7 +325,7 @@ guaranteed by the originator of a cluster definition."
 (ert-deftest shadow-test02-files ()
   "Check file manipulation functions."
   (skip-unless (not (memq system-type '(windows-nt ms-dos))))
-  (skip-unless (file-remote-p shadow-test-remote-temporary-file-directory))
+  (skip-unless (file-remote-p ert-remote-temporary-file-directory))
 
   (let ((shadow-info-file shadow-test-info-file)
 	(shadow-todo-file shadow-test-todo-file)
@@ -398,8 +367,7 @@ guaranteed by the originator of a cluster definition."
            (string-equal (shadow-local-file (concat primary file)) file))
 
 	  ;; Redefine the cluster.
-	  (setq primary
-		(file-remote-p shadow-test-remote-temporary-file-directory)
+	  (setq primary (file-remote-p ert-remote-temporary-file-directory)
 		regexp (shadow-regexp-superquote primary))
 	  (shadow-set-cluster cluster primary regexp)
 
@@ -428,7 +396,7 @@ guaranteed by the originator of a cluster definition."
 (ert-deftest shadow-test03-expand-cluster-in-file-name ()
   "Check canonical file name of a cluster or site."
   (skip-unless (not (memq system-type '(windows-nt ms-dos))))
-  (skip-unless (file-remote-p shadow-test-remote-temporary-file-directory))
+  (skip-unless (file-remote-p ert-remote-temporary-file-directory))
 
   (let ((shadow-info-file shadow-test-info-file)
 	(shadow-todo-file shadow-test-todo-file)
@@ -453,8 +421,7 @@ guaranteed by the originator of a cluster definition."
 		file2
 		(make-temp-name
 		 (expand-file-name
-		  "shadowfile-tests"
-		  shadow-test-remote-temporary-file-directory)))
+                  "shadowfile-tests" ert-remote-temporary-file-directory)))
 
           ;; A local file name is kept.
           (should
@@ -473,8 +440,7 @@ guaranteed by the originator of a cluster definition."
             (shadow-expand-cluster-in-file-name (concat primary file1)) file1))
 
 	  ;; Redefine the cluster.
-	  (setq primary
-		(file-remote-p shadow-test-remote-temporary-file-directory)
+	  (setq primary (file-remote-p ert-remote-temporary-file-directory)
 		regexp (shadow-regexp-superquote primary))
 	  (shadow-set-cluster cluster primary regexp)
 
@@ -495,7 +461,7 @@ guaranteed by the originator of a cluster definition."
 (ert-deftest shadow-test04-contract-file-name ()
   "Check canonical file name of a cluster or site."
   (skip-unless (not (memq system-type '(windows-nt ms-dos))))
-  (skip-unless (file-remote-p shadow-test-remote-temporary-file-directory))
+  (skip-unless (file-remote-p ert-remote-temporary-file-directory))
 
   (let ((shadow-info-file shadow-test-info-file)
 	(shadow-todo-file shadow-test-todo-file)
@@ -533,8 +499,7 @@ guaranteed by the originator of a cluster definition."
             (concat "/cluster:" file)))
 
 	  ;; Redefine the cluster.
-	  (setq primary
-		(file-remote-p shadow-test-remote-temporary-file-directory)
+	  (setq primary (file-remote-p ert-remote-temporary-file-directory)
 		regexp (shadow-regexp-superquote primary))
 	  (shadow-set-cluster cluster primary regexp)
 
@@ -542,8 +507,7 @@ guaranteed by the originator of a cluster definition."
           (should
            (string-equal
             (shadow-contract-file-name
-             (concat
-              (file-remote-p shadow-test-remote-temporary-file-directory) file))
+             (concat (file-remote-p ert-remote-temporary-file-directory) file))
             (concat "/cluster:" file))))
 
       ;; Cleanup.
@@ -552,7 +516,7 @@ guaranteed by the originator of a cluster definition."
 (ert-deftest shadow-test05-file-match ()
   "Check `shadow-same-site' and `shadow-file-match'."
   (skip-unless (not (memq system-type '(windows-nt ms-dos))))
-  (skip-unless (file-remote-p shadow-test-remote-temporary-file-directory))
+  (skip-unless (file-remote-p ert-remote-temporary-file-directory))
 
   (let ((shadow-info-file shadow-test-info-file)
 	(shadow-todo-file shadow-test-todo-file)
@@ -588,17 +552,14 @@ guaranteed by the originator of a cluster definition."
           (should (shadow-file-match (shadow-parse-name file) file))
 
 	  ;; Redefine the cluster.
-	  (setq primary
-		(file-remote-p shadow-test-remote-temporary-file-directory)
+	  (setq primary (file-remote-p ert-remote-temporary-file-directory)
 		regexp (shadow-regexp-superquote primary))
 	  (shadow-set-cluster cluster primary regexp)
 
           (should
 	   (shadow-file-match
 	    (shadow-parse-name
-	     (concat
-	      (file-remote-p shadow-test-remote-temporary-file-directory)
-	      file))
+	     (concat (file-remote-p ert-remote-temporary-file-directory) file))
 	    file)))
 
       ;; Cleanup.
@@ -607,7 +568,7 @@ guaranteed by the originator of a cluster definition."
 (ert-deftest shadow-test06-literal-groups ()
   "Check literal group definitions."
   (skip-unless (not (memq system-type '(windows-nt ms-dos))))
-  (skip-unless (file-remote-p shadow-test-remote-temporary-file-directory))
+  (skip-unless (file-remote-p ert-remote-temporary-file-directory))
 
   (let ((shadow-info-file shadow-test-info-file)
 	(shadow-todo-file shadow-test-todo-file)
@@ -632,8 +593,7 @@ guaranteed by the originator of a cluster definition."
 	  (shadow-set-cluster cluster1 primary regexp)
 
 	  (setq cluster2 "cluster2"
-		primary
-		(file-remote-p shadow-test-remote-temporary-file-directory)
+		primary (file-remote-p ert-remote-temporary-file-directory)
 		regexp (format "^\\(%s\\|%s\\)$" shadow-system-name primary))
 	  (shadow-set-cluster cluster2 primary regexp)
 
@@ -644,8 +604,7 @@ guaranteed by the originator of a cluster definition."
 		file2
 		(make-temp-name
 		 (expand-file-name
-		  "shadowfile-tests"
-		  shadow-test-remote-temporary-file-directory))
+		  "shadowfile-tests" ert-remote-temporary-file-directory))
 		mocked-input
                 `(,cluster1 ,file1 ,cluster2 ,file2
                   ,primary ,file1 ,(kbd "RET")))
@@ -694,7 +653,7 @@ guaranteed by the originator of a cluster definition."
 (ert-deftest shadow-test07-regexp-groups ()
   "Check regexp group definitions."
   (skip-unless (not (memq system-type '(windows-nt ms-dos))))
-  (skip-unless (file-remote-p shadow-test-remote-temporary-file-directory))
+  (skip-unless (file-remote-p ert-remote-temporary-file-directory))
 
   (let ((shadow-info-file shadow-test-info-file)
 	(shadow-todo-file shadow-test-todo-file)
@@ -719,8 +678,7 @@ guaranteed by the originator of a cluster definition."
 	  (shadow-set-cluster cluster1 primary regexp)
 
 	  (setq cluster2 "cluster2"
-		primary
-		(file-remote-p shadow-test-remote-temporary-file-directory)
+		primary (file-remote-p ert-remote-temporary-file-directory)
 		regexp (format "^\\(%s\\|%s\\)$" shadow-system-name primary))
 	  (shadow-set-cluster cluster2 primary regexp)
 
@@ -757,8 +715,8 @@ guaranteed by the originator of a cluster definition."
 (ert-deftest shadow-test08-shadow-todo ()
   "Check that needed shadows are added to todo."
   (skip-unless (not (memq system-type '(windows-nt ms-dos))))
-  (skip-unless (file-remote-p shadow-test-remote-temporary-file-directory))
-  (skip-unless (file-writable-p shadow-test-remote-temporary-file-directory))
+  (skip-unless (file-remote-p ert-remote-temporary-file-directory))
+  (skip-unless (file-writable-p ert-remote-temporary-file-directory))
 
   (let ((backup-inhibited t)
         create-lockfiles
@@ -778,7 +736,7 @@ guaranteed by the originator of a cluster definition."
             (message
              "%s %s %s %s %s"
              temporary-file-directory
-             shadow-test-remote-temporary-file-directory
+             ert-remote-temporary-file-directory
              shadow-homedir shadow-info-file shadow-todo-file))
 
           ;; Define clusters.
@@ -792,8 +750,7 @@ guaranteed by the originator of a cluster definition."
              cluster1 primary regexp shadow-clusters))
 
 	  (setq cluster2 "cluster2"
-		primary
-		(file-remote-p shadow-test-remote-temporary-file-directory)
+		primary (file-remote-p ert-remote-temporary-file-directory)
 		regexp (shadow-regexp-superquote primary))
 	  (shadow-set-cluster cluster2 primary regexp)
           (when shadow-debug
@@ -903,8 +860,8 @@ guaranteed by the originator of a cluster definition."
   "Check that needed shadow files are copied."
   :tags '(:expensive-test)
   (skip-unless (not (memq system-type '(windows-nt ms-dos))))
-  (skip-unless (file-remote-p shadow-test-remote-temporary-file-directory))
-  (skip-unless (file-writable-p shadow-test-remote-temporary-file-directory))
+  (skip-unless (file-remote-p ert-remote-temporary-file-directory))
+  (skip-unless (file-writable-p ert-remote-temporary-file-directory))
 
   (let ((backup-inhibited t)
         create-lockfiles
@@ -928,8 +885,7 @@ guaranteed by the originator of a cluster definition."
 	  (shadow-set-cluster cluster1 primary regexp)
 
 	  (setq cluster2 "cluster2"
-		primary
-		(file-remote-p shadow-test-remote-temporary-file-directory)
+		primary (file-remote-p ert-remote-temporary-file-directory)
 		regexp (shadow-regexp-superquote primary))
 	  (shadow-set-cluster cluster2 primary regexp)