source: vendor/perl/5.8.8/lib/filetest.t

#!./perl

BEGIN {
        chdir 't' if -d 't';
        @INC = '../lib';
}

use Config;
use Test::More tests => 15;

# these two should be kept in sync with the pragma itself
# if hint bits are changed there, other things *will* break
my $hint_bits = 0x00400000;
my $error = "filetest: the only implemented subpragma is 'access'.\n";

# can't use it yet, because of the import death
ok( require filetest, 'required pragma successfully' );

# and here's one culprit, right here
eval { filetest->import('bad subpragma') };
is( $@, $error, 'filetest dies with bad subpragma on import' );

is( $^H & $hint_bits, 0, 'hint bits not set without pragma in place' );

# now try the normal usage
# can't check $^H here; it's lexically magic (see perlvar)
# the test harness unintentionally hoards the goodies for itself
use_ok( 'filetest', 'access' );

# and import again, to see it here
filetest->import('access');
ok( $^H & $hint_bits, 'hint bits set with pragma loaded' );

# and now get rid of it
filetest->unimport('access');
is( $^H & $hint_bits, 0, 'hint bits not set with pragma unimported' );

eval { filetest->unimport() };
is( $@, $error, 'filetest dies without subpragma on unimport' );

# there'll be a compilation aborted failure here, with the eval string
eval "no filetest 'fake pragma'";
like( $@, qr/^$error/, 'filetest dies with bad subpragma on unuse' );

eval "use filetest 'bad subpragma'";
like( $@, qr/^$error/, 'filetest dies with bad subpragma on use' );

eval "use filetest";
like( $@, qr/^$error/, 'filetest dies with missing subpragma on use' );

eval "no filetest";
like( $@, qr/^$error/, 'filetest dies with missing subpragma on unuse' );

SKIP: {
    # A real test for filetest.
    # This works for systems with /usr/bin/chflags (i.e. BSD4.4 systems).
    my $chflags = "/usr/bin/chflags";
    my $tstfile = "filetest.tst";
    skip("No $chflags available", 4) if !-x $chflags;

    my $skip_eff_user_tests = (!$Config{d_setreuid} && !$Config{d_setresuid})
                                                    ||
                              (!$Config{d_setregid} && !$Config{d_setresgid});

    eval {
        if (!-e $tstfile) {
            open(T, ">$tstfile") or die "Can't create $tstfile: $!";
            close T;
        }
        system($chflags, "uchg", $tstfile);
        die "Can't exec $chflags uchg" if $? != 0;
    };
    skip("Errors in test using chflags: $@", 4) if $@;

    {
        use filetest 'access';
    SKIP: {
            skip("No tests on effective user id", 1)
                if $skip_eff_user_tests;
            is(-w $tstfile, undef, "$tstfile should not be recognized as writable");
        }
        is(-W $tstfile, undef, "$tstfile should not be recognized as writable");
    }

    {
        no filetest 'access';
    SKIP: {
            skip("No tests on effective user id", 1)
                if $skip_eff_user_tests;
            is(-w $tstfile, 1, "$tstfile should be recognized as writable");
        }
        is(-W $tstfile, 1, "$tstfile should be recognized as writable");
    }

    # cleanup
    system($chflags, "nouchg", $tstfile);
    unlink $tstfile;
    warn "Can't remove $tstfile: $!" if -e $tstfile;
}