Add tests for atom.el

diff --git a/atom-tests.el b/atom-tests.el
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+;;; atom-tests.el --- Tests for the atom.el library  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2024  Frédéric Perrin
+
+;; Author: Frédéric Perrin <frederic.perrin@resel.fr>
+;; Keywords: 
+
+;; 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 <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; 
+
+;;; Code:
+
+(normal-top-level-add-to-load-path (list default-directory))
+(require 'atom)
+
+
+(ert-deftest text-feed ()
+  (let* ((user-full-name "John Smith")
+        (user-mail-address "john.smith@example.org")
+        (my-atom-feed (atom-create "My feed" "http://example.org"))
+        (now (current-time)))
+    ;; A simple, text-only entry
+    (atom-add-text-entry
+     my-atom-feed
+     "Hello world"
+     "http://example.org/hello"
+     "Hello the world!"
+     now)
+
+    ;; <?xml version="1.0" encoding="utf-8"?>
+    ;; <feed xmlns="http://www.w3.org/2005/Atom">
+    ;; <title>My feed</title><link href="http://example.org"/><author>
+    ;;   <name>John Smith</name>
+    ;;   <email>john.smith@example.org</email>
+    ;; </author><updated>2024-03-13T21:55:38+00:00</updated><id>http://example.org</id><entry>
+    ;;   <title>Hello world</title>
+    ;;   <link href="http://example.org/hello"/>
+    ;;   <id>http://example.org/hello</id>
+    ;;   <updated>2024-03-13T21:54:14+00:00</updated>
+    ;;   <content>Hello the world!</content>
+    ;; </entry>
+    ;; </feed>
+
+    (with-temp-buffer
+      (atom-print my-atom-feed)
+      (let ((expected-strings
+            (list
+             "<title>My feed</title>"
+             "<name>John Smith</name>"
+             "<email>john.smith@example.org</email>"
+             "<link href=\"http://example.org\"/>"
+             "<entry>[[:space:]]+<title>Hello world</title>"
+             "<link href=\"http://example.org/hello\"/>"
+             "<id>http://example.org/hello</id>"
+             "<content>Hello the world!</content>")))
+       (dolist (exp-string expected-strings)
+         (goto-char (point-min))
+         (should (re-search-forward exp-string))))
+      (goto-char (point-min))
+      (re-search-forward "updated>\\(.*\\)</updated>")
+      (let* ((updated-string (match-string 1))
+            (updated-time (atom-parse-time updated-string)))
+       (should (equal updated-time (seq-take now 2)))))))
+
+(ert-deftest html-xhtml-feed ()
+  (let ((my-atom-feed (atom-create "My feed" "http://example.org")))
+
+    (atom-add-text-entry
+     my-atom-feed
+     "A text entry"
+     "http://example.org/text"
+     "Some text only")
+    (atom-add-html-entry
+     my-atom-feed
+     "An HTML entry"
+     "http://example.org/html"
+     "<p>One can also use <acronym>HTML</acronym> in the entries.</p>")
+    (atom-add-xhtml-entry
+     my-atom-feed
+     "A xHTML entry"
+     "http://example.org/xhtml"
+     "<p>One can also use <acronym>xHTML</acronym> in the entries.</p>")
+
+    ;; only check that we can print the feed...
+    (atom-print my-atom-feed)
+    (atom-print-as-rss my-atom-feed)))
+
+(ert-deftest atom-opt-elements ()
+  (let ((my-atom-feed (atom-create "My Feed" "http://example.org"
+                                  "Feed subtitle" ; subtitle
+                                  "http://example.org/feed.atom" ; self link
+                                  "urn:example-id" ; id
+                                  (cons "Author name" "Author addr")
+                                  "2024-04-23T01:02:03+04:00" ; updated
+                                  )))
+    (atom-add-text-entry
+     my-atom-feed
+     "A text entry"
+     "http://example.org/text"
+     "Some text"
+     "2024-04-23T01:02:03+04:00" ; updated
+     (atom-generate-id "http://example.org/text" (current-time)))))
+
+(provide 'atom-tests)
+;;; atom-tests.el ends here