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diff --git a/t/lib/open3.t b/t/lib/open3.t
index e69de29..bf042bf 100755
--- a/t/lib/open3.t
+++ b/t/lib/open3.t
@@ -0,0 +1,150 @@
+#!./perl -w
+
+BEGIN {
+    chdir 't' if -d 't';
+    unshift @INC, '../lib';
+    require Config; import Config;
+    if (!$Config{'d_fork'}
+       # open2/3 supported on win32 (but not Borland due to CRT bugs)
+       && ($^O ne 'MSWin32' || $Config{'cc'} =~ /^bcc/i))
+    {
+	print "1..0\n";
+	exit 0;
+    }
+    # make warnings fatal
+    $SIG{__WARN__} = sub { die @_ };
+}
+
+use strict;
+use IO::Handle;
+use IPC::Open3;
+#require 'open3.pl'; use subs 'open3';
+
+my $perl = $^X;
+
+sub ok {
+    my ($n, $result, $info) = @_;
+    if ($result) {
+	print "ok $n\n";
+    }
+    else {
+	print "not ok $n\n";
+	print "# $info\n" if $info;
+    }
+}
+
+sub cmd_line {
+	if ($^O eq 'MSWin32') {
+		my $cmd = shift;
+		$cmd =~ tr/\r\n//d;
+		$cmd =~ s/"/\\"/g;
+		return qq/"$cmd"/;
+	}
+	else {
+		return $_[0];
+	}
+}
+
+my ($pid, $reaped_pid);
+STDOUT->autoflush;
+STDERR->autoflush;
+
+print "1..22\n";
+
+# basic
+ok 1, $pid = open3 'WRITE', 'READ', 'ERROR', $perl, '-e', cmd_line(<<'EOF');
+    $| = 1;
+    print scalar <STDIN>;
+    print STDERR "hi error\n";
+EOF
+ok 2, print WRITE "hi kid\n";
+ok 3, <READ> =~ /^hi kid\r?\n$/;
+ok 4, <ERROR> =~ /^hi error\r?\n$/;
+ok 5, close(WRITE), $!;
+ok 6, close(READ), $!;
+ok 7, close(ERROR), $!;
+$reaped_pid = waitpid $pid, 0;
+ok 8, $reaped_pid == $pid, $reaped_pid;
+ok 9, $? == 0, $?;
+
+# read and error together, both named
+$pid = open3 'WRITE', 'READ', 'READ', $perl, '-e', cmd_line(<<'EOF');
+    $| = 1;
+    print scalar <STDIN>;
+    print STDERR scalar <STDIN>;
+EOF
+print WRITE "ok 10\n";
+print scalar <READ>;
+print WRITE "ok 11\n";
+print scalar <READ>;
+waitpid $pid, 0;
+
+# read and error together, error empty
+$pid = open3 'WRITE', 'READ', '', $perl, '-e', cmd_line(<<'EOF');
+    $| = 1;
+    print scalar <STDIN>;
+    print STDERR scalar <STDIN>;
+EOF
+print WRITE "ok 12\n";
+print scalar <READ>;
+print WRITE "ok 13\n";
+print scalar <READ>;
+waitpid $pid, 0;
+
+# dup writer
+ok 14, pipe PIPE_READ, PIPE_WRITE;
+$pid = open3 '<&PIPE_READ', 'READ', '',
+		    $perl, '-e', cmd_line('print scalar <STDIN>');
+close PIPE_READ;
+print PIPE_WRITE "ok 15\n";
+close PIPE_WRITE;
+print scalar <READ>;
+waitpid $pid, 0;
+
+# dup reader
+$pid = open3 'WRITE', '>&STDOUT', 'ERROR',
+		    $perl, '-e', cmd_line('print scalar <STDIN>');
+print WRITE "ok 16\n";
+waitpid $pid, 0;
+
+# dup error:  This particular case, duping stderr onto the existing
+# stdout but putting stdout somewhere else, is a good case because it
+# used not to work.
+$pid = open3 'WRITE', 'READ', '>&STDOUT',
+		    $perl, '-e', cmd_line('print STDERR scalar <STDIN>');
+print WRITE "ok 17\n";
+waitpid $pid, 0;
+
+# dup reader and error together, both named
+$pid = open3 'WRITE', '>&STDOUT', '>&STDOUT', $perl, '-e', cmd_line(<<'EOF');
+    $| = 1;
+    print STDOUT scalar <STDIN>;
+    print STDERR scalar <STDIN>;
+EOF
+print WRITE "ok 18\n";
+print WRITE "ok 19\n";
+waitpid $pid, 0;
+
+# dup reader and error together, error empty
+$pid = open3 'WRITE', '>&STDOUT', '', $perl, '-e', cmd_line(<<'EOF');
+    $| = 1;
+    print STDOUT scalar <STDIN>;
+    print STDERR scalar <STDIN>;
+EOF
+print WRITE "ok 20\n";
+print WRITE "ok 21\n";
+waitpid $pid, 0;
+
+# command line in single parameter variant of open3
+# for understanding of Config{'sh'} test see exec description in camel book
+my $cmd = 'print(scalar(<STDIN>))';
+$cmd = $Config{'sh'} =~ /sh/ ? "'$cmd'" : cmd_line($cmd);
+eval{$pid = open3 'WRITE', '>&STDOUT', 'ERROR', "$perl -e " . $cmd; };
+if ($@) {
+	print "error $@\n";
+	print "not ok 22\n";
+}
+else {
+	print WRITE "ok 22\n";
+	waitpid $pid, 0;
+}