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+;;; url-tramp-tests.el --- Test suite for Tramp / URL conversion.  -*- lexical-binding:t -*-
+
+;; Copyright (C) 2017-2022 Free Software Foundation, Inc.
+
+;; Author: Michael Albinus <michael.albinus@gmx.de>
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'url-tramp)
+(require 'ert)
+
+(ert-deftest url-tramp-test-convert-url-to-tramp ()
+  "Test that URLs are converted into proper Tramp file names."
+  (should
+   (string-equal
+    (url-tramp-convert-url-to-tramp "ftp://ftp.is.co.za/rfc/rfc1808.txt")
+    "/ftp:ftp.is.co.za:/rfc/rfc1808.txt"))
+
+  (should
+   (string-equal
+    (url-tramp-convert-url-to-tramp "ssh://user@localhost")
+    "/ssh:user@localhost:"))
+
+  (should
+   (string-equal
+    (url-tramp-convert-url-to-tramp "telnet://remotehost:42")
+    "/telnet:remotehost#42:"))
+
+  ;; The password will be added to the cache.  The password cache key
+  ;; is the remote file name identification of the Tramp file.
+  (should
+   (string-equal
+    (url-tramp-convert-url-to-tramp "scp://user:geheim@somewhere/localfile")
+    "/scp:user@somewhere:/localfile"))
+  (let ((key
+         (file-remote-p
+          (url-tramp-convert-url-to-tramp "scp://user@somewhere/localfile"))))
+    (should (password-in-cache-p key))
+    (should (string-equal (password-read-from-cache key) "geheim"))
+    (password-cache-remove key)
+    (should-not (password-in-cache-p key)))
+
+  ;; "http" does not belong to `url-tramp-protocols'.  The string
+  ;; isn't changed, therefore.
+  (should
+   (string-equal
+    (url-tramp-convert-url-to-tramp "http://www.gnu.org")
+    "http://www.gnu.org")))
+
+(ert-deftest url-tramp-test-convert-tramp-to-url ()
+  "Test that Tramp file names are converted into proper URLs."
+  (should
+   (string-equal
+    (url-tramp-convert-tramp-to-url "/ftp:ftp.is.co.za:/rfc/rfc1808.txt")
+    "ftp://ftp.is.co.za/rfc/rfc1808.txt"))
+
+  (should
+   (string-equal
+    (url-tramp-convert-tramp-to-url "/ssh:user@localhost:")
+    "ssh://user@localhost"))
+
+  (should
+   (string-equal
+    (url-tramp-convert-tramp-to-url "/telnet:user@remotehost#42:")
+    "telnet://user@remotehost:42"))
+
+  ;; "sftp" does not belong to `url-tramp-protocols'.  The string
+  ;; isn't changed, therefore.
+  (should
+   (string-equal
+    (url-tramp-convert-tramp-to-url "/sftp:user@localhost:")
+    "/sftp:user@localhost:")))
+
+(provide 'url-tramp-tests)
+
+;;; url-tramp-tests.el ends here