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diff --git a/test/lisp/shadowfile-tests.el b/test/lisp/shadowfile-tests.el
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+;;; shadowfile-tests.el --- Tests of shadowfile
+
+;; Copyright (C) 2018 Free Software Foundation, Inc.
+
+;; Author: Michael Albinus <michael.albinus@gmx.de>
+
+;; 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/'.
+
+;;; Commentary:
+
+;; A whole test run can be performed calling the command `shadowfile-test-all'.
+
+;;; 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.  It cannot be
+      ;; `temporary-directory', because the tests with "~" would fail.
+      (unless (and (null noninteractive) (file-directory-p "~/"))
+        (setenv "HOME" invocation-directory))
+      (format "/mock::%s" temporary-file-directory)))
+  "Temporary directory for Tramp tests.")
+
+(defconst shadow-test-info-file
+  (expand-file-name "shadows_test" temporary-file-directory)
+  "File to keep shadow information in during tests.")
+
+(defconst shadow-test-todo-file
+  (expand-file-name "shadow_todo_test" temporary-file-directory)
+  "File to store the list of uncopied shadows in during tests.")
+
+(ert-deftest shadow-test00-clusters ()
+  "Check cluster definitions.
+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 (file-remote-p shadow-test-remote-temporary-file-directory))
+
+  (let ((text-quoting-style 'grave) ;; We inspect the *Messages* buffer!
+        (inhibit-message t)
+        (shadow-info-file shadow-test-info-file)
+        (shadow-todo-file shadow-test-todo-file)
+        shadow-clusters
+        cluster primary regexp mocked-input)
+    (unwind-protect
+        ;; We must mock `read-from-minibuffer' and `read-string', in
+        ;; order to avoid interactive arguments.
+        (cl-letf* (((symbol-function 'read-from-minibuffer)
+                    (lambda (&rest args) (pop mocked-input)))
+                   ((symbol-function 'read-string)
+                    (lambda (&rest args) (pop mocked-input))))
+
+          ;; Cleanup.
+          (when (file-exists-p shadow-info-file)
+            (delete-file shadow-info-file))
+          (when (file-exists-p shadow-todo-file)
+            (delete-file shadow-todo-file))
+
+          ;; Define a cluster.
+          (setq cluster "cluster"
+                primary shadow-system-name
+                regexp (shadow-regexp-superquote primary)
+                mocked-input `(,cluster ,primary ,regexp))
+          (call-interactively 'shadow-define-cluster)
+          (should
+           (string-equal
+            (shadow-cluster-name (shadow-get-cluster cluster)) cluster))
+          (should
+           (string-equal
+            (shadow-cluster-primary (shadow-get-cluster cluster)) primary))
+          (should
+           (string-equal
+            (shadow-cluster-regexp (shadow-get-cluster cluster)) regexp))
+          (should-not (shadow-get-cluster "non-existent-cluster-name"))
+
+          ;; Test `shadow-set-cluster' and `make-shadow-cluster'.
+          (shadow-set-cluster cluster primary regexp)
+          (should
+           (equal (shadow-get-cluster cluster)
+                  (make-shadow-cluster
+                   :name cluster :primary primary :regexp regexp)))
+
+          ;; The primary must be either `shadow-system-name', or a remote file.
+          (setq ;; The second "cluster" is wrong.
+                mocked-input `(,cluster ,cluster ,primary ,regexp))
+          (with-current-buffer (messages-buffer)
+            (narrow-to-region (point-max) (point-max)))
+          (call-interactively 'shadow-define-cluster)
+          (should
+           (string-match
+            (regexp-quote "Not a valid primary!")
+            (with-current-buffer (messages-buffer) (buffer-string))))
+          ;; The first cluster definition is still valid.
+          (should
+           (string-equal
+            (shadow-cluster-name (shadow-get-cluster cluster)) cluster))
+          (should
+           (string-equal
+            (shadow-cluster-primary (shadow-get-cluster cluster)) primary))
+          (should
+           (string-equal
+            (shadow-cluster-regexp (shadow-get-cluster cluster)) regexp))
+
+          ;; The regexp must match the primary name.
+          (setq ;; The second "cluster" is wrong.
+                mocked-input `(,cluster ,primary ,cluster ,regexp))
+          (with-current-buffer (messages-buffer)
+            (narrow-to-region (point-max) (point-max)))
+          (call-interactively 'shadow-define-cluster)
+          (should
+           (string-match
+            (regexp-quote "Regexp doesn't include the primary host!")
+            (with-current-buffer (messages-buffer) (buffer-string))))
+          ;; The first cluster definition is still valid.
+          (should
+           (string-equal
+            (shadow-cluster-name (shadow-get-cluster cluster)) cluster))
+          (should
+           (string-equal
+            (shadow-cluster-primary (shadow-get-cluster cluster)) primary))
+          (should
+           (string-equal
+            (shadow-cluster-regexp (shadow-get-cluster cluster)) regexp))
+
+          ;; Redefine the cluster.
+          (setq primary
+                (file-remote-p shadow-test-remote-temporary-file-directory)
+                regexp (shadow-regexp-superquote primary)
+                mocked-input `(,cluster ,primary ,regexp))
+          (call-interactively 'shadow-define-cluster)
+          (should
+           (string-equal
+            (shadow-cluster-name (shadow-get-cluster cluster)) cluster))
+          (should
+           (string-equal
+            (shadow-cluster-primary (shadow-get-cluster cluster)) primary))
+          (should
+           (string-equal
+            (shadow-cluster-regexp (shadow-get-cluster cluster)) regexp))
+
+          ;; Test `shadow-set-cluster' and `make-shadow-cluster'.
+          (shadow-set-cluster cluster primary regexp)
+          (should
+           (equal (shadow-get-cluster cluster)
+                  (make-shadow-cluster
+                   :name cluster :primary primary :regexp regexp))))
+
+      ;; Cleanup.
+      (with-current-buffer (messages-buffer) (widen))
+      (when (file-exists-p shadow-info-file)
+        (delete-file shadow-info-file))
+      (when (file-exists-p shadow-todo-file)
+        (delete-file shadow-todo-file)))))
+
+(ert-deftest shadow-test01-sites ()
+  "Check site definitions.
+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 (file-remote-p shadow-test-remote-temporary-file-directory))
+
+  (let ((shadow-info-file shadow-test-info-file)
+        (shadow-todo-file shadow-test-todo-file)
+        shadow-clusters
+        cluster1 cluster2 primary1 primary2 regexp1 regexp2 mocked-input)
+    (unwind-protect
+        ;; We must mock `read-from-minibuffer' and `read-string', in
+        ;; order to avoid interactive arguments.
+        (cl-letf* (((symbol-function 'read-from-minibuffer)
+                    (lambda (&rest args) (pop mocked-input)))
+                   ((symbol-function 'read-string)
+                    (lambda (&rest args) (pop mocked-input))))
+
+          ;; Cleanup.
+          (when (file-exists-p shadow-info-file)
+            (delete-file shadow-info-file))
+          (when (file-exists-p shadow-todo-file)
+            (delete-file shadow-todo-file))
+
+          ;; Define a cluster.
+          (setq cluster1 "cluster1"
+                primary1 shadow-system-name
+                regexp1 (shadow-regexp-superquote primary1))
+          (shadow-set-cluster cluster1 primary1 regexp1)
+
+          ;; A site is either a cluster identification, or a primary host.
+          (should (string-equal cluster1 (shadow-site-name cluster1)))
+          (should (string-equal primary1 (shadow-name-site primary1)))
+          (should
+           (string-equal (format "/%s:" cluster1) (shadow-name-site cluster1)))
+          (should (string-equal (system-name) (shadow-site-name primary1)))
+          (should
+           (string-equal
+            (file-remote-p shadow-test-remote-temporary-file-directory)
+            (shadow-name-site
+             (file-remote-p shadow-test-remote-temporary-file-directory))))
+          (should
+           (string-equal
+            (file-remote-p shadow-test-remote-temporary-file-directory)
+            (shadow-site-name
+             (file-remote-p shadow-test-remote-temporary-file-directory))))
+
+          (should (equal (shadow-site-cluster cluster1)
+                         (shadow-get-cluster cluster1)))
+          (should (equal (shadow-site-cluster (shadow-name-site cluster1))
+                         (shadow-get-cluster cluster1)))
+          (should (equal (shadow-site-cluster primary1)
+                         (shadow-get-cluster cluster1)))
+          (should (equal (shadow-site-cluster (shadow-site-name primary1))
+                         (shadow-get-cluster cluster1)))
+          (should (string-equal (shadow-site-primary cluster1) primary1))
+          (should (string-equal (shadow-site-primary primary1) primary1))
+
+          ;; `shadow-read-site' accepts "cluster", "/cluster:",
+          ;; "system", "/system:".  It shall reject bad site names.
+          (setq mocked-input
+                `(,cluster1 ,(shadow-name-site cluster1)
+                  ,primary1 ,(shadow-site-name primary1)
+                  ,shadow-system-name "" "bad" "/bad:"))
+          (should (string-equal (shadow-read-site) cluster1))
+          (should (string-equal (shadow-read-site) (shadow-name-site cluster1)))
+          (should (string-equal (shadow-read-site) primary1))
+          (should (string-equal (shadow-read-site) (shadow-site-name primary1)))
+          (should (string-equal (shadow-read-site) shadow-system-name))
+          (should-not (shadow-read-site)) ; ""
+          (should-not (shadow-read-site)) ; "bad"
+          (should-not (shadow-read-site)) ; "/bad:"
+          (should-error (shadow-read-site)) ; no input at all
+
+          ;; Define a second cluster.
+          (setq cluster2 "cluster2"
+                primary2
+                (file-remote-p shadow-test-remote-temporary-file-directory)
+                regexp2 (format "^\\(%s\\|%s\\)$" shadow-system-name primary2))
+          (shadow-set-cluster cluster2 primary2 regexp2)
+
+          ;; `shadow-site-match' shall know all different kind of site names.
+          (should (shadow-site-match cluster1 cluster1))
+          (should (shadow-site-match primary1 primary1))
+          (should (shadow-site-match cluster1 primary1))
+          (should (shadow-site-match primary1 cluster1))
+          (should (shadow-site-match cluster2 cluster2))
+          (should (shadow-site-match primary2 primary2))
+          (should (shadow-site-match cluster2 primary2))
+          (should (shadow-site-match primary2 cluster2))
+
+          ;; The regexp of `cluster2' matches the primary of
+          ;; `cluster1'.  Not vice versa.
+          (should (shadow-site-match cluster2 cluster1))
+          (should-not (shadow-site-match cluster1 cluster2))
+
+          ;; If we use the primaries of a cluster, it doesn't match.
+          (should-not
+           (shadow-site-match (shadow-site-primary cluster2) cluster1))
+          (should-not
+           (shadow-site-match (shadow-site-primary cluster1) cluster2)))
+
+      ;; Cleanup.
+      (when (file-exists-p shadow-info-file)
+        (delete-file shadow-info-file))
+      (when (file-exists-p shadow-todo-file)
+        (delete-file shadow-todo-file)))))
+
+(ert-deftest shadow-test02-files ()
+  "Check file manipulation functions."
+  (skip-unless (file-remote-p shadow-test-remote-temporary-file-directory))
+
+  (let ((shadow-info-file shadow-test-info-file)
+        (shadow-todo-file shadow-test-todo-file)
+        shadow-clusters
+        cluster primary regexp file hup)
+    (unwind-protect
+        (progn
+          ;; Cleanup.
+          (when (file-exists-p shadow-info-file)
+            (delete-file shadow-info-file))
+          (when (file-exists-p shadow-todo-file)
+            (delete-file shadow-todo-file))
+
+          ;; Define a cluster.
+          (setq cluster "cluster"
+                primary shadow-system-name
+                regexp (shadow-regexp-superquote primary)
+                file (make-temp-name
+                      (expand-file-name
+                       "shadowfile-tests" temporary-file-directory)))
+          (shadow-set-cluster cluster primary regexp)
+
+          ;; The constant structure to compare with.
+          (setq hup (make-tramp-file-name :host (system-name) :localname file))
+
+          ;; The structure a local file is transformed in.
+          (should (equal (shadow-parse-name file) hup))
+          (should (equal (shadow-parse-name (concat "/" cluster ":" file)) hup))
+          (should (equal (shadow-parse-name (concat primary file)) hup))
+
+          ;; A local file name is kept.
+          (should
+           (string-equal (shadow-local-file file) file))
+          ;; A file on this cluster is also local.
+          (should
+           (string-equal
+            (shadow-local-file (concat "/" cluster ":" file)) file))
+          ;; A file on the primary host is also local.
+          (should
+           (string-equal (shadow-local-file (concat primary file)) file))
+
+          ;; Redefine the cluster.
+          (setq primary
+                (file-remote-p shadow-test-remote-temporary-file-directory)
+                regexp (shadow-regexp-superquote primary))
+          (shadow-set-cluster cluster primary regexp)
+
+          ;; The structure of the local file is still the same.
+          (should (equal (shadow-parse-name file) hup))
+          ;; The cluster name must be used.
+          (setf (tramp-file-name-host hup) cluster)
+          (should (equal (shadow-parse-name (concat "/" cluster ":" file)) hup))
+          ;; The structure of a remote file is different.
+          (should
+           (equal (shadow-parse-name (concat primary file))
+                  (tramp-dissect-file-name (concat primary file))))
+
+          ;; A local file is still local.
+          (should (shadow-local-file file))
+          ;; A file on this cluster is not local.
+          (should-not (shadow-local-file (concat "/" cluster ":" file)))
+          ;; A file on the primary host is not local.
+          (should-not (shadow-local-file (concat primary file)))
+          ;; There's no error on wrong FILE.
+          (should-not (shadow-local-file nil)))
+
+      ;; Cleanup.
+      (when (file-exists-p shadow-info-file)
+        (delete-file shadow-info-file))
+      (when (file-exists-p shadow-todo-file)
+        (delete-file shadow-todo-file)))))
+
+(ert-deftest shadow-test03-expand-cluster-in-file-name ()
+  "Check canonical file name of a cluster or site."
+  (skip-unless (file-remote-p shadow-test-remote-temporary-file-directory))
+
+  (let ((shadow-info-file shadow-test-info-file)
+        (shadow-todo-file shadow-test-todo-file)
+        shadow-clusters
+        cluster primary regexp file1 file2)
+    (unwind-protect
+        (progn
+          ;; Cleanup.
+          (when (file-exists-p shadow-info-file)
+            (delete-file shadow-info-file))
+          (when (file-exists-p shadow-todo-file)
+            (delete-file shadow-todo-file))
+
+          ;; Define a cluster.
+          (setq cluster "cluster"
+                primary shadow-system-name
+                regexp (shadow-regexp-superquote primary))
+          (shadow-set-cluster cluster primary regexp)
+
+          (setq file1
+                (make-temp-name
+                 (expand-file-name "shadowfile-tests" temporary-file-directory))
+                file2
+                (make-temp-name
+                 (expand-file-name
+                  "shadowfile-tests"
+                  shadow-test-remote-temporary-file-directory)))
+
+          ;; A local file name is kept.
+          (should
+           (string-equal (shadow-expand-cluster-in-file-name file1) file1))
+          ;; A remote file is kept.
+          (should
+           (string-equal (shadow-expand-cluster-in-file-name file2) file2))
+          ;; A cluster name is expanded to the primary name.
+          (should
+           (string-equal
+            (shadow-expand-cluster-in-file-name (format "/%s:%s" cluster file1))
+            (shadow-expand-cluster-in-file-name (concat primary file1))))
+          ;; A primary name is expanded if it is a local file name.
+          (should
+           (string-equal
+            (shadow-expand-cluster-in-file-name (concat primary file1)) file1))
+
+          ;; Redefine the cluster.
+          (setq primary
+                (file-remote-p shadow-test-remote-temporary-file-directory)
+                regexp (shadow-regexp-superquote primary))
+          (shadow-set-cluster cluster primary regexp)
+
+          ;; A cluster name is expanded to the primary name.
+          (should
+           (string-equal
+            (shadow-expand-cluster-in-file-name (format "/%s:%s" cluster file1))
+            (shadow-expand-cluster-in-file-name (concat primary file1))))
+          ;; A primary name is not expanded if it isn't is a local file name.
+          (should
+           (string-equal
+            (shadow-expand-cluster-in-file-name (concat primary file1))
+            (concat primary file1))))
+
+      ;; Cleanup.
+      (when (file-exists-p shadow-info-file)
+        (delete-file shadow-info-file))
+      (when (file-exists-p shadow-todo-file)
+        (delete-file shadow-todo-file)))))
+
+(ert-deftest shadow-test04-contract-file-name ()
+  "Check canonical file name of a cluster or site."
+  (skip-unless (file-remote-p shadow-test-remote-temporary-file-directory))
+
+  (let ((shadow-info-file shadow-test-info-file)
+        (shadow-todo-file shadow-test-todo-file)
+        shadow-clusters
+        cluster primary regexp file)
+    (unwind-protect
+        (progn
+          ;; Cleanup.
+          (when (file-exists-p shadow-info-file)
+            (delete-file shadow-info-file))
+          (when (file-exists-p shadow-todo-file)
+            (delete-file shadow-todo-file))
+
+          ;; Define a cluster.
+          (setq cluster "cluster"
+                primary shadow-system-name
+                regexp (shadow-regexp-superquote primary)
+                file (make-temp-name
+                      (expand-file-name
+                       "shadowfile-tests" temporary-file-directory)))
+          (shadow-set-cluster cluster primary regexp)
+
+          ;; The cluster name is prepended for local files.
+          (should
+           (string-equal
+            (shadow-contract-file-name file) (concat "/cluster:" file)))
+          ;; A cluster file name is preserved.
+          (should
+           (string-equal
+            (shadow-contract-file-name (concat "/cluster:" file))
+            (concat "/cluster:" file)))
+          ;; `shadow-system-name' is mapped to the cluster.
+          (should
+           (string-equal
+            (shadow-contract-file-name (concat shadow-system-name file))
+            (concat "/cluster:" file)))
+
+          ;; Redefine the cluster.
+          (setq primary
+                (file-remote-p shadow-test-remote-temporary-file-directory)
+                regexp (shadow-regexp-superquote primary))
+          (shadow-set-cluster cluster primary regexp)
+
+          ;; A remote file name is mapped to the cluster.
+          (should
+           (string-equal
+            (shadow-contract-file-name
+             (concat
+              (file-remote-p shadow-test-remote-temporary-file-directory) file))
+            (concat "/cluster:" file))))
+
+      ;; Cleanup.
+      (when (file-exists-p shadow-info-file)
+        (delete-file shadow-info-file))
+      (when (file-exists-p shadow-todo-file)
+        (delete-file shadow-todo-file)))))
+
+(ert-deftest shadow-test05-file-match ()
+  "Check `shadow-same-site' and `shadow-file-match'."
+  (skip-unless (file-remote-p shadow-test-remote-temporary-file-directory))
+
+  (let ((shadow-info-file shadow-test-info-file)
+        (shadow-todo-file shadow-test-todo-file)
+        shadow-clusters
+        cluster primary regexp file)
+    (unwind-protect
+        (progn
+          ;; Cleanup.
+          (when (file-exists-p shadow-info-file)
+            (delete-file shadow-info-file))
+          (when (file-exists-p shadow-todo-file)
+            (delete-file shadow-todo-file))
+
+          ;; Define a cluster.
+          (setq cluster "cluster"
+                primary shadow-system-name
+                regexp (shadow-regexp-superquote primary)
+                file (make-temp-name
+                      (expand-file-name
+                       "shadowfile-tests" temporary-file-directory)))
+          (shadow-set-cluster cluster primary regexp)
+
+          (should (shadow-same-site (shadow-parse-name "/cluster:") file))
+          (should
+           (shadow-same-site (shadow-parse-name shadow-system-name) file))
+          (should (shadow-same-site (shadow-parse-name file) file))
+
+          (should
+           (shadow-file-match
+            (shadow-parse-name (concat "/cluster:" file)) file))
+          (should
+           (shadow-file-match
+            (shadow-parse-name (concat shadow-system-name file)) file))
+          (should (shadow-file-match (shadow-parse-name file) file))
+
+          ;; Redefine the cluster.
+          (setq primary
+                (file-remote-p shadow-test-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))
+            file)))
+
+      ;; Cleanup.
+      (when (file-exists-p shadow-info-file)
+        (delete-file shadow-info-file))
+      (when (file-exists-p shadow-todo-file)
+        (delete-file shadow-todo-file)))))
+
+(ert-deftest shadow-test06-literal-groups ()
+  "Check literal group definitions."
+  (let ((shadow-info-file shadow-test-info-file)
+        (shadow-todo-file shadow-test-todo-file)
+        shadow-clusters shadow-literal-groups
+        cluster1 cluster2 primary regexp file1 file2 mocked-input)
+    (unwind-protect
+        ;; We must mock `read-from-minibuffer' and `read-string', in
+        ;; order to avoid interactive arguments.
+        (cl-letf* (((symbol-function 'read-from-minibuffer)
+                    (lambda (&rest args) (pop mocked-input)))
+                   ((symbol-function 'read-string)
+                    (lambda (&rest args) (pop mocked-input))))
+
+          ;; Cleanup.
+          (when (file-exists-p shadow-info-file)
+            (delete-file shadow-info-file))
+          (when (file-exists-p shadow-todo-file)
+            (delete-file shadow-todo-file))
+
+          ;; Define clusters.
+          (setq cluster1 "cluster1"
+                primary shadow-system-name
+                regexp (shadow-regexp-superquote primary))
+          (shadow-set-cluster cluster1 primary regexp)
+
+          (setq cluster2 "cluster2"
+                primary
+                (file-remote-p shadow-test-remote-temporary-file-directory)
+                regexp (format "^\\(%s\\|%s\\)$" shadow-system-name primary))
+          (shadow-set-cluster cluster2 primary regexp)
+
+          ;; Define a literal group.
+          (setq file1
+                (make-temp-name
+                 (expand-file-name "shadowfile-tests" temporary-file-directory))
+                file2
+                (make-temp-name
+                 (expand-file-name
+                  "shadowfile-tests"
+                  shadow-test-remote-temporary-file-directory))
+                mocked-input `(,cluster1 ,file1 ,cluster2 ,file2 ,(kbd "RET")))
+          (with-temp-buffer
+            (setq-local buffer-file-name file1)
+            (call-interactively 'shadow-define-literal-group))
+
+          ;; `shadow-literal-groups' is a list of lists.
+          (should (consp shadow-literal-groups))
+          (should (consp (car shadow-literal-groups)))
+          (should-not (cdr shadow-literal-groups))
+
+          (should (member (format "/%s:%s" cluster1 (file-local-name file1))
+                          (car shadow-literal-groups)))
+          (should (member (format "/%s:%s" cluster2 (file-local-name file2))
+                          (car shadow-literal-groups))))
+
+      ;; Cleanup.
+      (when (file-exists-p shadow-info-file)
+        (delete-file shadow-info-file))
+      (when (file-exists-p shadow-todo-file)
+        (delete-file shadow-todo-file)))))
+
+(ert-deftest shadow-test07-regexp-groups ()
+  "Check regexp group definitions."
+  (let ((shadow-info-file shadow-test-info-file)
+        (shadow-todo-file shadow-test-todo-file)
+        shadow-clusters shadow-regexp-groups
+        cluster1 cluster2 primary regexp file mocked-input)
+    (unwind-protect
+        ;; We must mock `read-from-minibuffer' and `read-string', in
+        ;; order to avoid interactive arguments.
+        (cl-letf* (((symbol-function 'read-from-minibuffer)
+                    (lambda (&rest args) (pop mocked-input)))
+                   ((symbol-function 'read-string)
+                    (lambda (&rest args) (pop mocked-input))))
+
+          ;; Cleanup.
+          (when (file-exists-p shadow-info-file)
+            (delete-file shadow-info-file))
+          (when (file-exists-p shadow-todo-file)
+            (delete-file shadow-todo-file))
+
+          ;; Define clusters.
+          (setq cluster1 "cluster1"
+                primary shadow-system-name
+                regexp (shadow-regexp-superquote primary))
+          (shadow-set-cluster cluster1 primary regexp)
+
+          (setq cluster2 "cluster2"
+                primary
+                (file-remote-p shadow-test-remote-temporary-file-directory)
+                regexp (format "^\\(%s\\|%s\\)$" shadow-system-name primary))
+          (shadow-set-cluster cluster2 primary regexp)
+
+          ;; Define a regexp group.
+          (setq file
+                (make-temp-name
+                 (expand-file-name "shadowfile-tests" temporary-file-directory))
+                mocked-input `(,(shadow-regexp-superquote file)
+                               ,cluster1 ,cluster2 ,(kbd "RET")))
+          (with-temp-buffer
+            (setq-local buffer-file-name nil)
+            (call-interactively 'shadow-define-regexp-group))
+
+          ;; `shadow-regexp-groups' is a list of lists.
+          (should (consp shadow-regexp-groups))
+          (should (consp (car shadow-regexp-groups)))
+          (should-not (cdr shadow-regexp-groups))
+
+          (should
+           (member
+            (concat
+             (shadow-site-primary cluster1) (shadow-regexp-superquote file))
+            (car shadow-regexp-groups)))
+          (should
+           (member
+            (concat
+             (shadow-site-primary cluster2) (shadow-regexp-superquote file))
+            (car shadow-regexp-groups))))
+
+      ;; Cleanup.
+      (when (file-exists-p shadow-info-file)
+        (delete-file shadow-info-file))
+      (when (file-exists-p shadow-todo-file)
+        (delete-file shadow-todo-file)))))
+
+(ert-deftest shadow-test08-shadow-todo ()
+  "Check that needed shadows are added to todo."
+  (let ((backup-inhibited t)
+        (shadow-info-file shadow-test-info-file)
+        (shadow-todo-file shadow-test-todo-file)
+        (shadow-inhibit-message t)
+        shadow-clusters shadow-literal-groups shadow-regexp-groups
+        shadow-files-to-copy
+        cluster1 cluster2 primary regexp file)
+    (unwind-protect
+        (progn
+          ;; Cleanup.
+          (when (file-exists-p shadow-info-file)
+            (delete-file shadow-info-file))
+          (when (file-exists-p shadow-todo-file)
+            (delete-file shadow-todo-file))
+
+          ;; Define clusters.
+          (setq cluster1 "cluster1"
+                primary shadow-system-name
+                regexp (shadow-regexp-superquote primary))
+          (shadow-set-cluster cluster1 primary regexp)
+
+          (setq cluster2 "cluster2"
+                primary
+                (file-remote-p shadow-test-remote-temporary-file-directory)
+                regexp (shadow-regexp-superquote primary))
+          (shadow-set-cluster cluster2 primary regexp)
+
+          ;; Define a literal group.
+          (setq file
+                (make-temp-name
+                 (expand-file-name "shadowfile-tests" temporary-file-directory))
+                shadow-literal-groups
+                `((,(concat "/cluster1:" file) ,(concat "/cluster2:" file))))
+
+          ;; Save file from "cluster1" definition.
+          (with-temp-buffer
+            (setq buffer-file-name file)
+            (insert "foo")
+            (save-buffer))
+          (should
+           (member
+            (cons file (shadow-contract-file-name (concat "/cluster2:" file)))
+            shadow-files-to-copy))
+
+          ;; Save file from "cluster2" definition.
+          (with-temp-buffer
+            (setq buffer-file-name (concat (shadow-site-primary cluster2) file))
+            (insert "foo")
+            (save-buffer))
+          (should
+           (member
+            (cons
+             (concat (shadow-site-primary cluster2) file)
+             (shadow-contract-file-name (concat "/cluster1:" file)))
+            shadow-files-to-copy))
+
+          ;; Define a regexp group.
+          (setq shadow-files-to-copy nil
+                shadow-regexp-groups
+                `((,(concat (shadow-site-primary cluster1)
+                            (shadow-regexp-superquote file))
+                   ,(concat (shadow-site-primary cluster2)
+                            (shadow-regexp-superquote file)))))
+
+          ;; Save file from "cluster1" definition.
+          (with-temp-buffer
+            (setq buffer-file-name file)
+            (insert "foo")
+            (save-buffer))
+          (should
+           (member
+            (cons file (shadow-contract-file-name (concat "/cluster2:" file)))
+            shadow-files-to-copy))
+
+          ;; Save file from "cluster2" definition.
+          (with-temp-buffer
+            (setq buffer-file-name (concat (shadow-site-primary cluster2) file))
+            (insert "foo")
+            (save-buffer))
+          (should
+           (member
+            (cons
+             (concat (shadow-site-primary cluster2) file)
+             (shadow-contract-file-name (concat "/cluster1:" file)))
+            shadow-files-to-copy)))
+
+      ;; Cleanup.
+      (when (file-exists-p shadow-info-file)
+        (delete-file shadow-info-file))
+      (when (file-exists-p shadow-todo-file)
+        (delete-file shadow-todo-file))
+      (when (file-exists-p file)
+        (delete-file file))
+      (when (file-exists-p (concat (shadow-site-primary cluster2) file))
+        (delete-file (concat (shadow-site-primary cluster2) file))))))
+
+(ert-deftest shadow-test09-shadow-copy-files ()
+  "Check that needed shadow files are copied."
+  (let ((backup-inhibited t)
+        (shadow-info-file shadow-test-info-file)
+        (shadow-todo-file shadow-test-todo-file)
+        (shadow-inhibit-message t)
+        (shadow-noquery t)
+        shadow-clusters shadow-files-to-copy
+        cluster1 cluster2 primary regexp file mocked-input)
+    (unwind-protect
+        (progn
+          ;; Cleanup.
+          (when (file-exists-p shadow-info-file)
+            (delete-file shadow-info-file))
+          (when (file-exists-p shadow-todo-file)
+            (delete-file shadow-todo-file))
+          (when (buffer-live-p shadow-todo-buffer)
+            (with-current-buffer shadow-todo-buffer (erase-buffer)))
+
+          ;; Define clusters.
+          (setq cluster1 "cluster1"
+                primary shadow-system-name
+                regexp (shadow-regexp-superquote primary))
+          (shadow-set-cluster cluster1 primary regexp)
+
+          (setq cluster2 "cluster2"
+                primary
+                (file-remote-p shadow-test-remote-temporary-file-directory)
+                regexp (shadow-regexp-superquote primary))
+          (shadow-set-cluster cluster2 primary regexp)
+
+          ;; Define files to copy.
+          (setq file
+                (make-temp-name
+                 (expand-file-name "shadowfile-tests" temporary-file-directory))
+                shadow-literal-groups
+                `((,(concat "/cluster1:" file) ,(concat "/cluster2:" file)))
+                shadow-regexp-groups
+                `((,(concat (shadow-site-primary cluster1)
+                            (shadow-regexp-superquote file))
+                   ,(concat (shadow-site-primary cluster2)
+                            (shadow-regexp-superquote file))))
+                mocked-input `(,(concat (shadow-site-primary cluster2) file)
+                               ,file))
+
+          ;; Save files.
+          (with-temp-buffer
+            (setq buffer-file-name file)
+            (insert "foo")
+            (save-buffer))
+          (with-temp-buffer
+            (setq buffer-file-name (concat (shadow-site-primary cluster2) file))
+            (insert "foo")
+            (save-buffer))
+
+          ;; We must mock `write-region', in order to check proper
+          ;; action.
+          (add-function
+           :before (symbol-function 'write-region)
+           (lambda (&rest args)
+             (when (and (buffer-file-name) mocked-input)
+               (should (equal (buffer-file-name) (pop mocked-input)))))
+           '((name . "write-region-mock")))
+
+          ;; Copy the files.
+          (shadow-copy-files 'noquery)
+          (should-not shadow-files-to-copy)
+          (with-current-buffer shadow-todo-buffer
+            (goto-char (point-min))
+            (should
+             (looking-at (regexp-quote "(setq shadow-files-to-copy nil)")))))
+
+      ;; Cleanup.
+      (remove-function (symbol-function 'write-region) "write-region-mock")
+      (when (file-exists-p shadow-info-file)
+        (delete-file shadow-info-file))
+      (when (file-exists-p shadow-todo-file)
+        (delete-file shadow-todo-file))
+      (when (file-exists-p file)
+        (delete-file file))
+      (when (file-exists-p (concat (shadow-site-primary cluster2) file))
+        (delete-file (concat (shadow-site-primary cluster2) file))))))
+
+(defun shadowfile-test-all (&optional interactive)
+  "Run all tests for \\[shadowfile]."
+  (interactive "p")
+  (if interactive
+      (ert-run-tests-interactively "^shadowfile-")
+    (ert-run-tests-batch "^shadowfile-")))
+
+(let ((shadow-info-file shadow-test-info-file)
+      (shadow-todo-file shadow-test-todo-file))
+  (shadow-initialize))
+
+(provide 'shadowfile-tests)
+;;; shadowfile-tests.el ends here