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}

# return the list of all theme items
sub _theme_items {
    my ($theme) = @_;

    # assume the module has already been loaded
    no strict 'refs';
    my $class = "Acme::MetaSyntactic::$theme";
    my @items
        = $class->isa('Acme::MetaSyntactic::List')
        ? @{"$class\::List"}
        : $class->isa('Acme::MetaSyntactic::MultiList')
        ? map @$_, values %{"$class\::MultiList"}
        : ();
    return @items;
}

sub _check_file_lines {
    my ($theme, $file, $mesg, $cb ) = @_;
    my $tb = __PACKAGE__->builder;
    $tb->plan( tests => 1 );
    local $Test::Builder::Level = $Test::Builder::Level + 1;

    # try to find a source file if none given
    $file ||= { Acme::MetaSyntactic->_find_themes(_starting_points) }->{$theme};

SKIP: {
        my ($fh, $skip);
        if ( $file ) {
            open $fh, $file or do { $skip = "Can't open $file: $!"; };
        }
        else {
            $skip = "This test needs the source file for $theme";
        }
        if( $skip ) {
            $tb->skip($skip);
            last SKIP;
        }

        my @lines = $cb->( <$fh> );
        $tb->is_num( scalar @lines, 0, sprintf $mesg, $file );
        map $tb->diag( $_ ), "Failed lines:\n", map "  $_", @lines if @lines;
        close $fh;
    }
}

#
# individual subtest functions
#

# t/01load.t
# t/51useall.t
sub subtest_load {
    my ($theme) = @_;
    my $tb = __PACKAGE__->builder;

    $tb->plan( tests => 2 );

    # load in the current process
    my ( $pkg, $error ) = _load( $theme, 1 );
    $tb->ok( !$error, "use Acme::MetaSyntactic::$theme;" );
    $tb->diag($error) if $error;

    # load in isolation
    local $ENV{PERL5LIB} = join $Config::Config{path_sep} || ';', @INC;
    `$^X -MAcme::MetaSyntactic::$theme -e1`;
    $tb->is_eq( $? >> 8, 0, "perl -MAcme::MetaSyntactic::$theme -e1" );
}

# t/02fixme.t
sub subtest_fixme {
    my ( $theme, $file ) = @_;
    $file = '' if !defined $file;
    _check_file_lines(
        $theme, $file,
        "No FIXME found in %s",
        sub { grep /\bFIXME\b/, @_ }
    );
}

sub subtest_encoding {
    my ( $theme, $file ) = @_;
    $file = '' if !defined $file;
    _check_file_lines(
        $theme, $file,
        "%s should have an =encoding line if it contains non-us-ascii characters",
        sub {
            my @non_ascii = grep /[^\x00-\x7f]/,   @_;
            my @encoding  = grep /^=encoding \S+/, @_;
            return @encoding ? () : @non_ascii;
        }
    );
}

# t/08theme.t
sub subtest_theme {
    my ($theme) = @_;
    my $tb = __PACKAGE__->builder;
    $tb->plan( tests => 2 );

    $tb->is_eq( eval { "Acme::MetaSyntactic::$theme"->theme },
        $theme, "theme() for Acme::MetaSyntactic::$theme" );
    $tb->is_eq( eval { "Acme::MetaSyntactic::$theme"->new->theme },
        $theme, "theme() for Acme::MetaSyntactic::$theme" );
}

# t/17import.t
sub subtest_import {
    my ($theme) = @_;
    my $tb = __PACKAGE__->builder;
    $tb->plan( tests => my $tests = 2 );

SKIP: {
        if ( $theme =~ /^(?:any|random)$/ ) {
            $tb->skip("Not testing import for theme $theme") for 1 .. $tests;
            last SKIP;
        }
        else {
            my ($pkg) = _load( $theme, 1 );
            my %seen = map { $_ => 1 } _theme_items($theme);

            no strict 'refs';