Use lexical-binding in sasl.el and add tests

* lisp/net/sasl.el:
* lisp/net/sasl-digest.el:
* lisp/net/sasl-cram.el:
* lisp/net/sasl-ntlm.el: Use lexical-binding.

* test/lisp/net/sasl-tests.el:
* test/lisp/net/sasl-cram-tests.el: New files.

6 files changed, 109 insertions, 4 deletions

diff --git a/lisp/net/sasl-cram.el b/lisp/net/sasl-cram.el
index bc2612d9452..4022a35b391 100644
--- a/lisp/net/sasl-cram.el
+++ b/lisp/net/sasl-cram.el
@@ -1,4 +1,4 @@
-;;; sasl-cram.el --- CRAM-MD5 module for the SASL client framework
+;;; sasl-cram.el --- CRAM-MD5 module for the SASL client framework  -*- lexical-binding: t -*-
 
 ;; Copyright (C) 2000, 2007-2021 Free Software Foundation, Inc.
 
diff --git a/lisp/net/sasl-digest.el b/lisp/net/sasl-digest.el
index efc8f82890c..5afc195d4b4 100644
--- a/lisp/net/sasl-digest.el
+++ b/lisp/net/sasl-digest.el
@@ -1,4 +1,4 @@
-;;; sasl-digest.el --- DIGEST-MD5 module for the SASL client framework
+;;; sasl-digest.el --- DIGEST-MD5 module for the SASL client framework  -*- lexical-binding: t -*-
 
 ;; Copyright (C) 2000, 2007-2021 Free Software Foundation, Inc.
 
diff --git a/lisp/net/sasl-ntlm.el b/lisp/net/sasl-ntlm.el
index 66582265615..1ceb6d179ca 100644
--- a/lisp/net/sasl-ntlm.el
+++ b/lisp/net/sasl-ntlm.el
@@ -1,4 +1,4 @@
-;;; sasl-ntlm.el --- NTLM (NT Lan Manager) module for the SASL client framework
+;;; sasl-ntlm.el --- NTLM (NT Lan Manager) module for the SASL client framework  -*- lexical-binding: t -*-
 
 ;; Copyright (C) 2000, 2007-2021 Free Software Foundation, Inc.
 
diff --git a/lisp/net/sasl.el b/lisp/net/sasl.el
index d2e08f7e3ed..aa4681f11c8 100644
--- a/lisp/net/sasl.el
+++ b/lisp/net/sasl.el
@@ -1,4 +1,4 @@
-;;; sasl.el --- SASL client framework
+;;; sasl.el --- SASL client framework  -*- lexical-binding: t -*-
 
 ;; Copyright (C) 2000, 2007-2021 Free Software Foundation, Inc.
 
diff --git a/test/lisp/net/sasl-cram-tests.el b/test/lisp/net/sasl-cram-tests.el
new file mode 100644
index 00000000000..e0230ddee60
--- /dev/null
+++ b/test/lisp/net/sasl-cram-tests.el
@@ -0,0 +1,46 @@
+;;; sasl-cram-tests.el --- tests for sasl-cram.el  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2021 Free Software Foundation, Inc.
+
+;; Author: Stefan Kangas <stefankangas@gmail.com>
+
+;; 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/>.
+
+;;; Commentary:
+
+;; Test case from RFC 2195.
+
+;;; Code:
+
+(require 'ert)
+(require 'sasl)
+(require 'sasl-cram)
+
+(ert-deftest sasl-cram-md5-response-test ()
+  ;; The following strings are taken from section 2 of RFC 2195.
+  (let ((client
+         (sasl-make-client (sasl-find-mechanism '("CRAM-MD5"))
+			   "user"
+			   "imap"
+                           "localhost"))
+        (data (base64-decode-string "PDE4OTYuNjk3MTcwOTUyQHBvc3RvZmZpY2UucmVzdG9uLm1jaS5uZXQ+"))
+        (sasl-read-passphrase
+         (lambda (_prompt) (copy-sequence "tanstaaftanstaaf"))))
+    (should (equal (sasl-cram-md5-response client (vector nil data))
+                   "user b913a602c7eda7a495b4e6e7334d3890"))))
+
+(provide 'sasl-cram-tests)
+;;; sasl-cram-tests.el ends here
diff --git a/test/lisp/net/sasl-tests.el b/test/lisp/net/sasl-tests.el
new file mode 100644
index 00000000000..dab40754c00
--- /dev/null
+++ b/test/lisp/net/sasl-tests.el
@@ -0,0 +1,59 @@
+;;; sasl-tests.el --- tests for sasl.el  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2021 Free Software Foundation, Inc.
+
+;; Author: Stefan Kangas <stefankangas@gmail.com>
+
+;; 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/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'ert)
+(require 'sasl)
+
+(ert-deftest sasl-test-make-client ()
+  (let ((client (sasl-make-client 'foo 'bar 'baz 'zut)))
+    (should (eq (sasl-client-mechanism client) 'foo))
+    (should (eq (sasl-client-name client) 'bar))
+    (should (eq (sasl-client-service client) 'baz))
+    (should (eq (sasl-client-server client) 'zut))))
+
+(ert-deftest sasl-test-client-set-properties ()
+  (let ((client (sasl-make-client 'foo 'bar 'baz 'zut)))
+    (sasl-client-set-property client 'foo 'bar)
+    (should (eq (sasl-client-property client 'foo) 'bar))))
+
+(ert-deftest sasl-test-step-data ()
+  (let ((step [nil nil]))
+    (sasl-step-set-data step "foo")
+    (should (equal (sasl-step-data step) "foo"))))
+
+(ert-deftest sasl-test-unique-id ()
+  (should (stringp (sasl-unique-id)))
+  (should-not (equal (sasl-unique-id) (sasl-unique-id))))
+
+(ert-deftest sasl-test-find-mechanism ()
+  (should (sasl-find-mechanism '("ANONYMOUS")))
+  (should-not (sasl-find-mechanism '("nonexistent mechanism"))))
+
+(ert-deftest sasl-test-mechanism-name ()
+  (let ((mechanism (sasl-find-mechanism '("ANONYMOUS"))))
+    (should (equal (sasl-mechanism-name mechanism) "ANONYMOUS"))))
+
+(provide 'sasl-tests)
+;;; sasl-tests.el ends here