diff --git a/test/unit/lib/redmine/wiki_formatting/copypre_scrubber_test.rb b/test/unit/lib/redmine/wiki_formatting/copypre_scrubber_test.rb
new file mode 100644
index 000000000..b3393eea2
--- /dev/null
+++ b/test/unit/lib/redmine/wiki_formatting/copypre_scrubber_test.rb
@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+# Redmine - project management software
+# Copyright (C) 2006-  Jean-Philippe Lang
+#
+# 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 2
+# 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+require_relative '../../../../test_helper'
+
+class Redmine::WikiFormatting::CopypreScrubberTest < ActiveSupport::TestCase
+  def filter(html)
+    fragment = Redmine::WikiFormatting::HtmlParser.parse(html)
+    scrubber = Redmine::WikiFormatting::CopypreScrubber.new
+    fragment.scrub!(scrubber)
+    fragment.to_s
+  end
+
+  test 'should add copy button to all pre blocks' do
+    input = <<~HTML
+      <pre>Block 1</pre>
+      <pre>Block 2</pre>
+    HTML
+
+    output = filter(input)
+
+    # Check that each pre block is wrapped and has a copy button
+    assert_equal 2, output.scan('<div class="pre-wrapper" data-controller="clipboard">').size
+    assert_equal 2, output.scan('class="copy-pre-content-link icon-only"').size
+  end
+end