pandoc/test/command/5700.md

```
% pandoc -t native -s --metadata-file command/5700-metadata-file-1.yml --metadata-file command/5700-metadata-file-2.yml
^D
Pandoc
  ( Meta
    { unMeta = fromList
      [
        ( "desc"
        , MetaInlines
          [ Str "Both"
          , Space
          , Str "of"
          , Space
          , Str "these"
          , Space
          , Str "files"
          , Space
          , Str "should"
          , Space
          , Str "be"
          , Space
          , Str "loaded."
          ]
        )
      ,
        ( "title"
        , MetaInlines
          [ Str "Multiple"
          , Space
          , Str "metadata"
          , Space
          , Str "files"
          , Space
          , Str "test"
          ]
        )
      ]
    }
  ) []
```