my $empty_code_json = '[{"code":"CODE_2","value":""}]';

    $verification_token = md5_hex( time() . {} . rand() . {} . $$ );

    $patron_modification = Koha::Patron::Modification->new(

        {   borrowernumber      => $patron->borrowernumber,

            extended_attributes => $empty_code_json,

            verification_token  => $verification_token

        }

    )->store();

    ok( $patron_modification->approve,

        'Patron modification correctly approved' );

    @patron_attributes

        = map { $_->unblessed }

        Koha::Patron::Attributes->search(

        { borrowernumber => $patron->borrowernumber } );

    is( $patron_attributes[0]->{code},

        'CODE_1', 'Untouched attribute type is preserved (code)' );

    is( $patron_attributes[0]->{attribute},

        'VALUE_1', 'Untouched attribute type is preserved (attribute)' );

    my $count = Koha::Patron::Attributes->search({ borrowernumber => $patron->borrowernumber, code => 'CODE_2' })->count;

    is( $count, 0, 'Attributes deleted when modification contained an empty one');