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diff --git a/t/op/grent.t b/t/op/grent.t
index a04b51b..3611c1b 100755
--- a/t/op/grent.t
+++ b/t/op/grent.t
@@ -2,34 +2,115 @@
 
 BEGIN {
     chdir 't' if -d 't';
-    @INC = "../lib" if -d "../lib";
-    eval { require Config; import Config; };
+    @INC = '../lib';
+    require './test.pl';
+}
 
-    my $GR = "/etc/group";
+eval {my @n = getgrgid 0};
+if ($@ =~ /(The \w+ function is unimplemented)/) {
+    skip_all "getgrgid unimplemented";
+}
+
+eval { require Config; import Config; };
+my $reason;
+if ($Config{'i_grp'} ne 'define') {
+	$reason = '$Config{i_grp} not defined';
+}
+elsif (not -f "/etc/group" ) { # Play safe.
+	$reason = 'no /etc/group file';
+}
+
+if (not defined $where) {	# Try NIS.
+    foreach my $ypcat (qw(/usr/bin/ypcat /bin/ypcat /etc/ypcat)) {
+        if (-x $ypcat &&
+            open(GR, "$ypcat group 2>/dev/null |") &&
+            defined(<GR>)) 
+        {
+            print "# `ypcat group` worked\n";
+
+            # Check to make sure we're really using NIS.
+            if( open(NSSW, "/etc/nsswitch.conf" ) ) {
+                my($group) = grep /^\s*group:/, <NSSW>;
+
+                # If there's no group line, assume it default to compat.
+                if( !$group || $group !~ /(nis|compat)/ ) {
+                    print "# Doesn't look like you're using NIS in ".
+                          "/etc/nsswitch.conf\n";
+                    last;
+                }
+            }
+            $where = "NIS group - $ypcat";
+            undef $reason;
+            last;
+        }
+    }
+}
 
-    if ($Config{'i_grp'} ne 'define' or not -f $GR or not open(GR, $GR)) {
-	print "1..0\n";
-	exit 0;
+if (not defined $where) {	# Try NetInfo.
+    foreach my $nidump (qw(/usr/bin/nidump)) {
+        if (-x $nidump &&
+            open(GR, "$nidump group . 2>/dev/null |") &&
+            defined(<GR>)) 
+        {
+            $where = "NetInfo group - $nidump";
+            undef $reason;
+            last;
+        }
     }
 }
 
-print "1..1\n";
+if (not defined $where) {	# Try local.
+    my $GR = "/etc/group";
+    if (-f $GR && open(GR, $GR) && defined(<GR>)) {
+        undef $reason;
+        $where = "local $GR";
+    }
+}
+
+if ($reason) {
+    skip_all $reason;
+}
+
+
+# By now the GR filehandle should be open and full of juicy group entries.
+
+plan tests => 3;
 
 # Go through at most this many groups.
-my $max = 25; #
+# (note that the first entry has been read away by now)
+my $max = 25;
 
-my $n = 0;
-my $not;
+my $n   = 0;
 my $tst = 1;
+my %perfect;
+my %seen;
+
+print "# where $where\n";
+
+ok( setgrent(), 'setgrent' ) || print "# $!\n";
 
-$not = 0;
 while (<GR>) {
-    last if $n == $max;
     chomp;
-    @s = split /:/;
+    # LIMIT -1 so that groups with no users don't fall off
+    my @s = split /:/, $_, -1;
+    my ($name_s,$passwd_s,$gid_s,$members_s) = @s;
+    if (@s) {
+	push @{ $seen{$name_s} }, $.;
+    } else {
+	warn "# Your $where line $. is empty.\n";
+	next;
+    }
+    if ($n == $max) {
+	local $/;
+	my $junk = <GR>;
+	last;
+    }
+    # In principle we could whine if @s != 4 but do we know enough
+    # of group file formats everywhere?
     if (@s == 4) {
-	my ($name_s,$passwd_s,$gid_s,$members_s) = @s;
-	$members_s =~ s/ /,/g;
+	$members_s =~ s/\s*,\s*/,/g;
+	$members_s =~ s/\s+$//;
+	$members_s =~ s/^\s+//;
 	@n = getgrgid($gid_s);
 	# 'nogroup' et al.
 	next unless @n;
@@ -40,18 +121,68 @@ while (<GR>) {
 	    ($name,$passwd,$gid,$members) = @n;
 	    next if $name_s ne $name;
 	}
-	$members =~ s/ /,/g;
-	$not = 1, last
-	    if $name    ne $name_s    or
-# Shadow passwords confuse this.
-#              $passwd  ne $passwd_s  or
-               $gid     ne $gid_s     or
-               $members ne $members_s;
+	# NOTE: group names *CAN* contain whitespace.
+	$members =~ s/\s+/,/g;
+	# what about different orders of members?
+	$perfect{$name_s}++
+	    if $name    eq $name_s    and
+# Do not compare passwords: think shadow passwords.
+# Not that group passwords are used much but better not assume anything.
+               $gid     eq $gid_s     and
+               $members eq $members_s;
     }
     $n++;
 }
 
-print "not " if $not;
-print "ok ", $tst++, "\n";
+endgrent();
+
+print "# max = $max, n = $n, perfect = ", scalar keys %perfect, "\n";
+
+if (keys %perfect == 0 && $n) {
+    $max++;
+    print <<EOEX;
+#
+# The failure of op/grent test is not necessarily serious.
+# It may fail due to local group administration conventions.
+# If you are for example using both NIS and local groups,
+# test failure is possible.  Any distributed group scheme
+# can cause such failures.
+#
+# What the grent test is doing is that it compares the $max first
+# entries of $where
+# with the results of getgrgid() and getgrnam() call.  If it finds no
+# matches at all, it suspects something is wrong.
+# 
+EOEX
+
+    fail();
+    print "#\t (not necessarily serious: run t/op/grent.t by itself)\n";
+} else {
+    pass();
+}
+
+# Test both the scalar and list contexts.
+
+my @gr1;
+
+setgrent();
+for (1..$max) {
+    my $gr = scalar getgrent();
+    last unless defined $gr;
+    push @gr1, $gr;
+}
+endgrent();
+
+my @gr2;
+
+setgrent();
+for (1..$max) {
+    my ($gr) = (getgrent());
+    last unless defined $gr;
+    push @gr2, $gr;
+}
+endgrent();
+
+is("@gr1", "@gr2");
 
 close(GR);