new file mode 100644
--- /dev/null
+++ b/stream_ssl_preread.t
@@ -0,0 +1,206 @@
+#!/usr/bin/perl
+
+# (C) Sergey Kandaurov
+# (C) Nginx, Inc.
+
+# Tests for stream_ssl_preread module.
+
+###############################################################################
+
+use warnings;
+use strict;
+
+use Test::More;
+
+BEGIN { use FindBin; chdir($FindBin::Bin); }
+
+use lib 'lib';
+use Test::Nginx;
+
+###############################################################################
+
+select STDERR; $| = 1;
+select STDOUT; $| = 1;
+
+my $t = Test::Nginx->new()->has(qw/stream stream_map stream_ssl_preread/)
+	->has(qw/http http_ssl stream_ssl/)->has_daemon('openssl')
+	->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+stream {
+    log_format status $status;
+
+    map $ssl_preread_server_name $name {
+        ""       127.0.0.1:8093;
+        default  $ssl_preread_server_name;
+    }
+
+    upstream foo {
+        server 127.0.0.1:8091;
+    }
+
+    upstream bar {
+        server 127.0.0.1:8092;
+    }
+
+    ssl_preread  on;
+
+    server {
+        listen       127.0.0.1:8080;
+        proxy_pass   $name;
+    }
+
+    server {
+        listen       127.0.0.1:8081;
+        proxy_pass   $name;
+        ssl_preread  off;
+    }
+
+    ssl_certificate_key localhost.key;
+    ssl_certificate localhost.crt;
+
+    server {
+        listen       127.0.0.1:8082 ssl;
+        proxy_pass   $name;
+        proxy_ssl    on;
+    }
+
+    server {
+        listen       127.0.0.1:8083;
+        proxy_pass   $name;
+
+        preread_timeout      2s;
+        preread_buffer_size  42;
+
+        access_log %%TESTDIR%%/status.log status;
+    }
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    ssl_certificate_key localhost.key;
+    ssl_certificate localhost.crt;
+
+    server {
+        listen       127.0.0.1:8091 ssl;
+        listen       127.0.0.1:8092 ssl;
+        listen       127.0.0.1:8093 ssl;
+        server_name  localhost;
+
+        location / {
+            add_header X-Port $server_port always;
+        }
+    }
+}
+
+EOF
+
+eval { require IO::Socket::SSL; die if $IO::Socket::SSL::VERSION < 1.56; };
+plan(skip_all => 'IO::Socket::SSL version >= 1.56 required') if $@;
+
+eval {
+	if (IO::Socket::SSL->can('can_client_sni')) {
+		IO::Socket::SSL->can_client_sni() or die;
+	}
+};
+plan(skip_all => 'IO::Socket::SSL with OpenSSL SNI support required') if $@;
+
+eval {
+	my $ctx = Net::SSLeay::CTX_new() or die;
+	my $ssl = Net::SSLeay::new($ctx) or die;
+	Net::SSLeay::set_tlsext_host_name($ssl, 'example.org') == 1 or die;
+};
+plan(skip_all => 'Net::SSLeay with OpenSSL SNI support required') if $@;
+
+$t->plan(9);
+
+$t->write_file('openssl.conf', <<EOF);
+[ req ]
+default_bits = 2048
+encrypt_key = no
+distinguished_name = req_distinguished_name
+[ req_distinguished_name ]
+EOF
+
+my $d = $t->testdir();
+
+foreach my $name ('localhost') {
+	system('openssl req -x509 -new '
+		. "-config '$d/openssl.conf' -subj '/CN=$name/' "
+		. "-out '$d/$name.crt' -keyout '$d/$name.key' "
+		. ">>$d/openssl.out 2>&1") == 0
+		or die "Can't create certificate for $name: $!\n";
+}
+
+$t->run();
+
+###############################################################################
+
+my ($p1, $p2, $p3) = (port(8091), port(8092), port(8093));
+
+like(https_get_host('foo'), qr/$p1/, 'sni');
+like(https_get_host('foo'), qr/$p1/, 'sni again');
+
+like(https_get_host('bar'), qr/$p2/, 'sni 2');
+like(https_get_host('bar'), qr/$p2/, 'sni 2 again');
+
+# fallback to an empty value for some reason
+
+like(https_get_host('foo', ''), qr/$p3/, 'no sni');
+like(https_get_host('foo', 'foo', 8081), qr/$p3/, 'no preread');
+like(https_get_host('foo', 'foo', 8082), qr/$p3/, 'no handshake');
+
+is(https_get_host('foo', 'foo', 8083), undef, 'preread buffer full');
+
+$t->stop();
+
+is($t->read_file('status.log'), "400\n", 'preread buffer full - log');
+
+###############################################################################
+
+sub get_ssl_socket {
+	my ($host, $port) = @_;
+	my $s;
+
+	eval {
+		local $SIG{ALRM} = sub { die "timeout\n" };
+		local $SIG{PIPE} = sub { die "sigpipe\n" };
+		alarm(2);
+		$s = IO::Socket::SSL->new(
+			Proto => 'tcp',
+			PeerAddr => '127.0.0.1:' . port($port || 8080),
+			SSL_hostname => $host,
+			SSL_verify_mode => IO::Socket::SSL::SSL_VERIFY_NONE(),
+			SSL_error_trap => sub { die $_[1] }
+		);
+		alarm(0);
+	};
+	alarm(0);
+
+	if ($@) {
+		log_in("died: $@");
+		return undef;
+	}
+
+	return $s;
+}
+
+sub https_get_host {
+	my ($host, $sni, $port) = @_;
+	my $s = get_ssl_socket(defined $sni ? $sni : $host, $port) or return;
+
+	return http(<<EOF, socket => $s);
+GET / HTTP/1.0
+Host: $host
+
+EOF
+}
+
+###############################################################################