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diff --git a/t/op/sleep.t b/t/op/sleep.t
old mode 100644
new mode 100755
index c26d397..3f5bbe0
--- a/t/op/sleep.t
+++ b/t/op/sleep.t
@@ -1,8 +1,22 @@
 #!./perl
 
-# $Header: sleep.t,v 4.0 91/03/20 01:54:34 lwall Locked $
+BEGIN {
+    chdir 't' if -d 't';
+    @INC = qw(. ../lib);
+}
 
-print "1..1\n";
+require "test.pl";
+plan( tests => 4 );
 
-$x = sleep 2;
-if ($x >= 2 && $x <= 10) {print "ok 1\n";} else {print "not ok 1 $x\n";}
+use strict;
+use warnings;
+
+my $start = time;
+my $sleep_says = sleep 3;
+my $diff = time - $start;
+
+cmp_ok( $sleep_says, '>=', 2,  'Sleep says it slept at least 2 seconds' );
+cmp_ok( $sleep_says, '<=', 10, '... and no more than 10' );
+
+cmp_ok( $diff, '>=', 2,  'Actual time diff is at least 2 seconds' );
+cmp_ok( $diff, '<=', 10, '... and no more than 10' );