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diff --git a/test/lisp/gnus/nnrss-tests.el b/test/lisp/gnus/nnrss-tests.el
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+++ b/test/lisp/gnus/nnrss-tests.el
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+;;; nnrss-tests.el --- tests for gnus/nnrss.el    -*- lexical-binding:t -*-
+
+;; Copyright (C) 2019-2022 Free Software Foundation, Inc.
+
+;; 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 'ert)
+(require 'nnrss)
+
+(ert-deftest test-nnrss-normalize ()
+  (should (equal (nnrss-normalize-date "2004-09-17T05:09:49.001+00:00")
+                 "Fri, 17 Sep 2004 05:09:49 +0000")))
+
+(defconst test-nnrss-xml
+  '((rss
+     ((version . "2.0")
+      (xmlns:dc . "http://purl.org/dc/elements/1.1/"))
+     (channel
+      ((xmlns:content . "http://purl.org/rss/1.0/modules/content/"))))))
+
+(ert-deftest test-nnrss-namespace-top ()
+  (should (equal (nnrss-get-namespace-prefix
+                  test-nnrss-xml "http://purl.org/dc/elements/1.1/")
+                 "dc:")))
+(ert-deftest test-nnrss-namespace-inner ()
+  (should (equal (nnrss-get-namespace-prefix
+                  test-nnrss-xml "http://purl.org/rss/1.0/modules/content/")
+                 "content:")))
+
+;;; nnrss-tests.el ends here