diff --git a/test/unit/lib/redmine/helpers/diff_test.rb b/test/unit/lib/redmine/helpers/diff_test.rb
index fb95125df..c896b9f52 100644
--- a/test/unit/lib/redmine/helpers/diff_test.rb
+++ b/test/unit/lib/redmine/helpers/diff_test.rb
@@ -32,8 +32,9 @@ class DiffTest < ActiveSupport::TestCase
     after  = "other stuff <script>alert('foo');</alert>"
 
     computed_diff = Redmine::Helpers::Diff.new(before, after).to_html
-    expected_diff = '<span class="diff_in">&lt;stuff&gt; with html &amp; special chars&lt;/danger&gt;</span> <span class="diff_out">other stuff &lt;script&gt;alert(&#39;foo&#39;);&lt;/alert&gt;</span>'
-
+    expected_diff =
+      '<span class="diff_in">&lt;stuff&gt; with html &amp; special chars&lt;/danger&gt;</span>' \
+        ' <span class="diff_out">other stuff &lt;script&gt;alert(&#39;foo&#39;);&lt;/alert&gt;</span>'
     assert_equal computed_diff, expected_diff
   end
 end