diff --git a/test/unit/lib/redmine/scm/adapters/mercurial_adapter_test.rb b/test/unit/lib/redmine/scm/adapters/mercurial_adapter_test.rb
index 4c8a58fa0..ab0809862 100644
--- a/test/unit/lib/redmine/scm/adapters/mercurial_adapter_test.rb
+++ b/test/unit/lib/redmine/scm/adapters/mercurial_adapter_test.rb
@@ -284,6 +284,12 @@ begin
         end
       end
 
+      def test_tag_non_ascii
+        p = "latin-1-dir/test-#{@char_1}-1.txt"
+        assert @adapter.cat(p, @tag_char_1)
+        assert_equal 1, @adapter.annotate(p, @tag_char_1).lines.length
+      end
+
       def test_nodes_in_branch
          [
             'default',