> env PERL_CORE=1 ./perl -I../lib ../ext/Cwd/t/cwd.t
1..33
ok 1 # skip no need to check for blib/ in the core
ok 2 - main->can(...)
ok 3 - chdir() not exported by default
ok 4 -   nor abs_path()
ok 5 -   nor fast_abs_path()
ok 6 - cwd() shouldn't create spurious entries in %ENV
# native pwd = '/usr/bin/pwd'
ok 7 - cwd()
ok 8 - getcwd()
ok 9 - fastcwd()
ok 10 - fastgetcwd()
ok 11
ok 12 - cwd()
ok 13
ok 14 - getcwd()
ok 15
ok 16 - fastcwd()
ok 17
ok 18 - fastgetcwd()
ok 19 - Cwd::chdir() updates $ENV{PWD}
#/app/ollie/downloads/perl-5.8.8/t/_ptrslt_/_path_/_to_/_a_
#/app/ollie/downloads/perl-5.8.8/t/_ptrslt_/_path_/_to_
#/app/ollie/downloads/perl-5.8.8/t/_ptrslt_/_path_
#/app/ollie/downloads/perl-5.8.8/t/_ptrslt_
#/app/ollie/downloads/perl-5.8.8/t
ok 20
ok 21
ok 22
ok 23
ok 24
ok 25 - abs_path() can be invoked on a file
ok 26 - fast_abs_path() can be invoked on a file
ok 27 - _perl_abs_path() can be invoked on a file
ok 28 - abs_path() can be invoked on a file
ok 29 - fast_abs_path() can be invoked on a file
ok 30 - _perl_abs_path() can be invoked on a file
^C

##</code><code>##

#!./perl -w

BEGIN {
    if ($ENV{PERL_CORE}) {
        chdir 't';
        @INC = '../lib';
    }
}
use Cwd;
chdir 't';

use strict;
use Config;
use File::Spec;
use File::Path;

use lib File::Spec->catdir('t', 'lib');
use Test::More;
require VMS::Filespec if $^O eq 'VMS';

my $tests = 29;
# _perl_abs_path() currently only works when the directory separator
# is '/', so don't test it when it won't work.
my $EXTRA_ABSPATH_TESTS = ($Config{prefix} =~ m/\//) && $^O ne 'cygwin';
$tests += 4 if $EXTRA_ABSPATH_TESTS;
plan tests => $tests;

SKIP: {
  skip "no need to check for blib/ in the core", 1 if $ENV{PERL_CORE};
  like $INC{'Cwd.pm'}, qr{blib}i, "Cwd should be loaded from blib/ during testing";
}

my $IsVMS = $^O eq 'VMS';
my $IsMacOS = $^O eq 'MacOS';

# check imports
can_ok('main', qw(cwd getcwd fastcwd fastgetcwd));
ok( !defined(&chdir),           'chdir() not exported by default' );
ok( !defined(&abs_path),        '  nor abs_path()' );
ok( !defined(&fast_abs_path),   '  nor fast_abs_path()');

{
  my @fields = qw(PATH IFS CDPATH ENV BASH_ENV);
  my $before = grep exists $ENV{$_}, @fields;
  cwd();
  my $after = grep exists $ENV{$_}, @fields;
  is($before, $after, "cwd() shouldn't create spurious entries in %ENV");
}

# XXX force Cwd to bootsrap its XSUBs since we have set @INC = "../lib"
# XXX and subsequent chdir()s can make them impossible to find
eval { fastcwd };

# Must find an external pwd (or equivalent) command.

my $pwd = $^O eq 'MSWin32' ? "cmd" : "pwd";
my $pwd_cmd =
    ($^O eq "NetWare") ?
        "cd" :
    ($IsMacOS) ?
        "pwd" :
        (grep { -x && -f } map { "$_/$pwd$Config{exe_ext}" }
	                   split m/$Config{path_sep}/, $ENV{PATH})[0];

$pwd_cmd = 'SHOW DEFAULT' if $IsVMS;
if ($^O eq 'MSWin32') {
    $pwd_cmd =~ s,/,\\,g;
    $pwd_cmd = "$pwd_cmd /c cd";
}
$pwd_cmd =~ s=\\=/=g if ($^O eq 'dos');

SKIP: {
    skip "No native pwd command found to test against", 4 unless $pwd_cmd;

    print "# native pwd = '$pwd_cmd'\n";

    local @ENV{qw(PATH IFS CDPATH ENV BASH_ENV)};
    my ($pwd_cmd_untainted) = $pwd_cmd =~ /^(.+)$/; # Untaint.
    chomp(my $start = `$pwd_cmd_untainted`);

    # Win32's cd returns native C:\ style
    $start =~ s,\\,/,g if ($^O eq 'MSWin32' || $^O eq "NetWare");
    # DCL SHOW DEFAULT has leading spaces
    $start =~ s/^\s+// if $IsVMS;
    SKIP: {
        skip("'$pwd_cmd' failed, nothing to test against", 4) if $?;
        skip("/afs seen, paths unlikely to match", 4) if $start =~ m|/afs/|;

	# Darwin's getcwd(3) (which Cwd.xs:bsd_realpath() uses which
	# Cwd.pm:getcwd uses) has some magic related to the PWD
	# environment variable: if PWD is set to a directory that
	# looks about right (guess: has the same (dev,ino) as the '.'?),
	# the PWD is returned.  However, if that path contains
	# symlinks, the path will not be equal to the one returned by
	# /bin/pwd (which probably uses the usual walking upwards in
	# the path -trick).  This situation is easy to reproduce since
	# /tmp is a symlink to /private/tmp.  Therefore we invalidate
	# the PWD to force getcwd(3) to (re)compute the cwd in full.
	# Admittedly fixing this in the Cwd module would be better
	# long-term solution but deleting $ENV{PWD} should not be
	# done light-heartedly. --jhi
	delete $ENV{PWD} if $^O eq 'darwin';

	my $cwd        = cwd;
	my $getcwd     = getcwd;
	my $fastcwd    = fastcwd;
	my $fastgetcwd = fastgetcwd;

	is($cwd,        $start, 'cwd()');
	is($getcwd,     $start, 'getcwd()');
	is($fastcwd,    $start, 'fastcwd()');
	is($fastgetcwd, $start, 'fastgetcwd()');
    }
}

my @test_dirs = qw{_ptrslt_ _path_ _to_ _a_ _dir_};
my $Test_Dir     = File::Spec->catdir(@test_dirs);

mkpath([$Test_Dir], 0, 0777);
Cwd::chdir $Test_Dir;

foreach my $func (qw(cwd getcwd fastcwd fastgetcwd)) {
  my $result = eval "$func()";
  is $@, '';
  dir_ends_with( $result, $Test_Dir, "$func()" );
}

# Cwd::chdir should also update $ENV{PWD}
dir_ends_with( $ENV{PWD}, $Test_Dir, 'Cwd::chdir() updates $ENV{PWD}' );
my $updir = File::Spec->updir;
Cwd::chdir $updir;
print "#$ENV{PWD}\n";
Cwd::chdir $updir;
print "#$ENV{PWD}\n";
Cwd::chdir $updir;
print "#$ENV{PWD}\n";
Cwd::chdir $updir;
print "#$ENV{PWD}\n";
Cwd::chdir $updir;
print "#$ENV{PWD}\n";

rmtree($test_dirs[0], 0, 0);

{
  my $check = ($IsVMS   ? qr|\b((?i)t)\]$| :
	       $IsMacOS ? qr|\bt:$| :
			  qr|\bt$| );
  
  like($ENV{PWD}, $check);
}

{
  # Make sure abs_path() doesn't trample $ENV{PWD}
  my $start_pwd = $ENV{PWD};
  mkpath([$Test_Dir], 0, 0777);
  Cwd::abs_path($Test_Dir);
  is $ENV{PWD}, $start_pwd;
  rmtree($test_dirs[0], 0, 0);
}

SKIP: {
    skip "no symlinks on this platform", 2+$EXTRA_ABSPATH_TESTS unless $Config{d_symlink};

    mkpath([$Test_Dir], 0, 0777);
    symlink $Test_Dir, "linktest";

    my $abs_path      =  Cwd::abs_path("linktest");
    my $fast_abs_path =  Cwd::fast_abs_path("linktest");
    my $want          =  File::Spec->catdir("t", $Test_Dir);

    like($abs_path,      qr|$want$|);
    like($fast_abs_path, qr|$want$|);
    like(Cwd::_perl_abs_path("linktest"), qr|$want$|) if $EXTRA_ABSPATH_TESTS;

    rmtree($test_dirs[0], 0, 0);
    unlink "linktest";
}

if ($ENV{PERL_CORE}) {
    chdir '../ext/Cwd/t';
    unshift @INC, '../../../lib';
}

# Make sure we can run abs_path() on files, not just directories
my $path = 'cwd.t';
path_ends_with(Cwd::abs_path($path), 'cwd.t', 'abs_path() can be invoked on a file');
path_ends_with(Cwd::fast_abs_path($path), 'cwd.t', 'fast_abs_path() can be invoked on a file');
path_ends_with(Cwd::_perl_abs_path($path), 'cwd.t', '_perl_abs_path() can be invoked on a file')
  if $EXTRA_ABSPATH_TESTS;

$path = File::Spec->catfile(File::Spec->updir, 't', $path);
path_ends_with(Cwd::abs_path($path), 'cwd.t', 'abs_path() can be invoked on a file');
path_ends_with(Cwd::fast_abs_path($path), 'cwd.t', 'fast_abs_path() can be invoked on a file');
path_ends_with(Cwd::_perl_abs_path($path), 'cwd.t', '_perl_abs_path() can be invoked on a file')
  if $EXTRA_ABSPATH_TESTS;


  
SKIP: {
  my $file;
  {
    my $root = Cwd::abs_path(File::Spec->rootdir);	# Add drive letter?
    local *FH;
    opendir FH, $root or skip("Can't opendir($root): $!", 2+$EXTRA_ABSPATH_TESTS);
    ($file) = grep {-f $_ and not -l $_} map File::Spec->catfile($root, $_), readdir FH;
    closedir FH;
  }
  skip "No plain file in root directory to test with", 2+$EXTRA_ABSPATH_TESTS unless $file;
  
  $file = VMS::Filespec::rmsexpand($file) if $^O eq 'VMS';
  is Cwd::abs_path($file), $file, 'abs_path() works on files in the root directory';
  is Cwd::fast_abs_path($file), $file, 'fast_abs_path() works on files in the root directory';
  is Cwd::_perl_abs_path($file), $file, '_perl_abs_path() works on files in the root directory'
    if $EXTRA_ABSPATH_TESTS;
}


#############################################
# These routines give us sort of a poor-man's cross-platform
# directory or path comparison capability.

sub bracketed_form_dir {
  return join '', map "[$_]", 
    grep length, File::Spec->splitdir(File::Spec->canonpath( shift() ));
}

sub dir_ends_with {
  my ($dir, $expect) = (shift, shift);
  my $bracketed_expect = quotemeta bracketed_form_dir($expect);
  like( bracketed_form_dir($dir), qr|$bracketed_expect$|i, (@_ ? shift : ()) );
}

sub bracketed_form_path {
  return join '', map "[$_]", 
    grep length, File::Spec->splitpath(File::Spec->canonpath( shift() ));
}

sub path_ends_with {
  my ($dir, $expect) = (shift, shift);
  my $bracketed_expect = quotemeta bracketed_form_path($expect);
  like( bracketed_form_path($dir), qr|$bracketed_expect$|i, (@_ ? shift : ()) );
}

##</code><code>##

Summary of my perl5 (revision 5 version 8 subversion 8) configuration:
  Platform:
    osname=solaris, osvers=2.9, archname=sun4-solaris
    uname='sunos elctrbz72 5.9 generic_112233-11 sun4u sparc sunw,sun-fire-v210 '
    config_args='-Dprefix=/usr -Dversiononly -Dextras=Bundle::LWP Bundle::DBI DBD::Oracle'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O',
    cppflags='-I/usr/local/include'
    ccversion='Sun C 5.8 2005/10/13', gccversion='', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=4321
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/lib -L/usr/ccs/lib -L/app/bin/SUNWspro/prod/lib/v8plus -L/app/bin/SUNWspro/prod/lib -L/lib -L/usr/local/lib '
    libpth=/opt/sfw/lib /usr/lib /usr/ccs/lib /app/bin/SUNWspro/prod/lib/v8plus /app/bin/SUNWspro/prod/lib /lib /usr/local/lib
    libs=-lsocket -lnsl -ldb -ldl -lm -lc
    perllibs=-lsocket -lnsl -ldl -lm -lc
    libc=/lib/libc.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
    cccdlflags='-KPIC', lddlflags='-G -L/usr/lib -L/usr/ccs/lib -L/app/bin/SUNWspro/prod/lib/v8plus -L/app/bin/SUNWspro/prod/lib -L/lib -L/usr/local/lib'


Characteristics of this binary (from libperl): 
  Compile-time options: PERL_MALLOC_WRAP USE_LARGE_FILES USE_PERLIO
  Built under solaris
  Compiled at Jan 22 2007 11:37:14
  %ENV:
    PERL5LIB="/webfiles/localmods"
  @INC:
    lib
    /webfiles/localmods
    /usr/lib/perl5/5.8.8/sun4-solaris
    /usr/lib/perl5/5.8.8
    /usr/lib/perl5/site_perl/5.8.8/sun4-solaris
    /usr/lib/perl5/site_perl/5.8.8
    /usr/lib/perl5/site_perl
    /webfiles/localmods
    .