new file mode 100644
--- /dev/null
+++ b/t/delay_body.t
@@ -0,0 +1,112 @@
+#!/usr/bin/perl
+
+# (C) Maxim Dounin
+
+# Tests for delay body filter module.
+
+###############################################################################
+
+use warnings;
+use strict;
+
+use Test::More;
+use Test::Nginx;
+
+use Socket qw/ CRLF /;
+
+###############################################################################
+
+select STDERR; $| = 1;
+select STDOUT; $| = 1;
+
+my $t = Test::Nginx->new()->has(qw/http proxy rewrite/)
+	->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    server {
+        listen       127.0.0.1:8080;
+        server_name  localhost;
+        location / {
+            delay_body 1s;
+            add_header X-Time $request_time;
+            proxy_pass http://127.0.0.1:8080/empty;
+        }
+        location /empty {
+            return 200 "test response body\n";
+        }
+    }
+}
+
+EOF
+
+$t->try_run('no delay_body')->plan(4);
+
+###############################################################################
+
+like(get_body('/', '123456'), qr/200 OK.*X-Time: 1/ms, 'delay');
+like(get_body('/empty', '123456'), qr/200 OK.*X-Time: 0/ms, 'no delay');
+
+# pipelining
+
+like(get_body('/', '123456', '12345X'),
+	qr/200 OK.*X-Time: 1.*200 OK.*X-Time: 1/ms,
+	'pipelining delay');
+
+# pipelining with chunked
+
+like(get_chunked('/', '123456', '12345X'),
+	qr/200 OK.*X-Time: 1.*200 OK.*X-Time: 1/ms,
+	'pipelining chunked delay');
+
+###############################################################################
+
+sub get_body {
+	my $uri = shift;
+	my $last = pop;
+	return http( join '', (map {
+		my $body = $_;
+		"GET $uri HTTP/1.1" . CRLF
+		. "Host: localhost" . CRLF
+		. "Content-Length: " . (length $body) . CRLF . CRLF
+		. $body
+	} @_),
+		"GET $uri HTTP/1.1" . CRLF
+		. "Host: localhost" . CRLF
+		. "Connection: close" . CRLF
+		. "Content-Length: " . (length $last) . CRLF . CRLF
+		. $last
+	);
+}
+
+sub get_chunked {
+	my $uri = shift;
+	my $last = pop;
+	return http( join '', (map {
+		my $body = $_;
+		"GET $uri HTTP/1.1" . CRLF
+		. "Host: localhost" . CRLF
+		. "Transfer-Encoding: chunked" . CRLF . CRLF
+		. sprintf("%x", length $body) . CRLF
+		. $body . CRLF
+		. "0" . CRLF . CRLF
+	} @_),
+		"GET $uri HTTP/1.1" . CRLF
+		. "Host: localhost" . CRLF
+		. "Connection: close" . CRLF
+		. "Transfer-Encoding: chunked" . CRLF . CRLF
+		. sprintf("%x", length $last) . CRLF
+		. $last . CRLF
+		. "0" . CRLF . CRLF
+	);
+}
+
+###############################################################################