test_mozzip_compressed_files test failure in Alpine Linux

This bug was originally reported by ncopa@alpinelinux.org in Debian bug #916353:

Source: diffoscope
Version: 107
Control: submitter -1 ncopa@alpinelinux.org

_________________________ test_mozzip_compressed_files ____________________=
_____

mozzip_differences =3D [<Difference zipinfo /dev/stdin -- zipinfo /dev/stdi=
n []>, <Difference filetype from file(1) -- filetype from file(1) []>, <Dif=
ference dir/text -- dir/text []>]

    @skip_unless_tools_exist('zipinfo')
    def test_mozzip_compressed_files(mozzip_differences):
>       assert mozzip_differences[1].source1 =3D=3D 'dir/text'
E       AssertionError: assert 'filetype from file(1)' =3D=3D 'dir/text'
E         - filetype from file(1)
E         + dir/text