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diff --git a/t/op/read.t b/t/op/read.t
index 2746970..99a6216 100755
--- a/t/op/read.t
+++ b/t/op/read.t
@@ -2,18 +2,100 @@
 
 # $RCSfile: read.t,v $$Revision: 4.1 $$Date: 92/08/07 18:28:17 $
 
-print "1..4\n";
+BEGIN {
+    chdir 't';
+    @INC = '../lib';
+    require './test.pl';
+}
+use strict;
 
+plan tests => 2564;
 
-open(FOO,'op/read.t') || open(FOO,'t/op/read.t') || die "Can't open op.read";
-seek(FOO,4,0);
-$got = read(FOO,$buf,4);
+open(FOO,'op/read.t') || open(FOO,'t/op/read.t') || open(FOO,':op:read.t') || die "Can't open op.read";
+seek(FOO,4,0) or die "Seek failed: $!";
+my $buf;
+my $got = read(FOO,$buf,4);
 
-print ($got == 4 ? "ok 1\n" : "not ok 1\n");
-print ($buf eq "perl" ? "ok 2\n" : "not ok 2 :$buf:\n");
+is ($got, 4);
+is ($buf, "perl");
 
 seek (FOO,0,2) || seek(FOO,20000,0);
 $got = read(FOO,$buf,4);
 
-print ($got == 0 ? "ok 3\n" : "not ok 3\n");
-print ($buf eq "" ? "ok 4\n" : "not ok 4\n");
+is ($got, 0);
+is ($buf, "");
+
+# This is true if Config is not built, or if PerlIO is enabled
+# ie assume that PerlIO is present, unless we know for sure otherwise.
+my $has_perlio = !eval {
+    no warnings;
+    require Config;
+    !$Config::Config{useperlio}
+};
+
+my $tmpfile = 'Op_read.tmp';
+
+END { 1 while unlink $tmpfile }
+
+my (@values, @buffers) = ('', '');
+
+foreach (65, 161, 253, 9786) {
+    push @values, join "", map {chr $_} $_ .. $_ + 4;
+    push @buffers, join "", map {chr $_} $_ + 5 .. $_ + 20;
+}
+my @offsets = (0, 3, 7, 22, -1, -3, -5, -7);
+my @lengths = (0, 2, 5, 10);
+
+foreach my $value (@values) {
+    foreach my $initial_buffer (@buffers) {
+	my @utf8 = 1;
+	if ($value !~ tr/\0-\377//c) {
+	    # It's all 8 bit
+	    unshift @utf8, 0;
+	}
+      SKIP:
+	foreach my $utf8 (@utf8) {
+	    skip "Needs :utf8 layer but no perlio", 2 * @offsets * @lengths
+	      if $utf8 and !$has_perlio;
+
+	    1 while unlink $tmpfile;
+	    open FH, ">$tmpfile" or die "Can't open $tmpfile: $!";
+	    binmode FH, "utf8" if $utf8;
+	    print FH $value;
+	    close FH;
+	    foreach my $offset (@offsets) {
+		foreach my $length (@lengths) {
+		    # Will read the lesser of the length of the file and the
+		    # read length
+		    my $will_read = $value;
+		    if ($length < length $will_read) {
+			substr ($will_read, $length) = '';
+		    }
+		    # Going to trash this so need a copy
+		    my $buffer = $initial_buffer;
+
+		    my $expect = $buffer;
+		    if ($offset > 0) {
+			# Right pad with NUL bytes
+			$expect .= "\0" x $offset;
+			substr ($expect, $offset) = '';
+		    }
+		    substr ($expect, $offset) = $will_read;
+
+		    open FH, $tmpfile or die "Can't open $tmpfile: $!";
+		    binmode FH, "utf8" if $utf8;
+		    my $what = sprintf "%d into %d l $length o $offset",
+			ord $value, ord $buffer;
+		    $what .= ' u' if $utf8;
+		    $got = read (FH, $buffer, $length, $offset);
+		    is ($got, length $will_read, "got $what");
+		    is ($buffer, $expect, "buffer $what");
+		    close FH;
+		}
+	    }
+	}
+    }
+}
+
+
+