new file mode 100644
--- /dev/null
+++ b/proxy_max_temp_file_size.t
@@ -0,0 +1,84 @@
+#!/usr/bin/perl
+
+# (C) Sergey Kandaurov
+# (C) Nginx, Inc.
+
+# Tests for http proxy module, proxy_max_temp_file_size directive.
+
+###############################################################################
+
+use warnings;
+use strict;
+
+use Test::More;
+
+BEGIN { use FindBin; chdir($FindBin::Bin); }
+
+use lib 'lib';
+use Test::Nginx qw/ :DEFAULT http_content /;
+
+###############################################################################
+
+select STDERR; $| = 1;
+select STDOUT; $| = 1;
+
+my $t = Test::Nginx->new()->has(qw/http proxy/)->plan(4);
+
+$t->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    server {
+        listen       127.0.0.1:8080 sndbuf=32k;
+        server_name  localhost;
+
+        proxy_buffer_size 4k;
+        proxy_buffers 8 4k;
+
+        location / {
+            proxy_max_temp_file_size 4k;
+            proxy_pass http://127.0.0.1:8081/;
+        }
+
+        location /off/ {
+            proxy_max_temp_file_size 0;
+            proxy_pass http://127.0.0.1:8081/;
+        }
+    }
+
+    server {
+        listen       127.0.0.1:8081;
+        server_name  localhost;
+
+        location / { }
+    }
+}
+
+EOF
+
+$t->write_file('1', 'X' x (1024 * 1024));
+$t->run();
+
+###############################################################################
+
+# test that the response is wholly proxied when all event pipe buffers are full
+
+my $body = http_content(http_get('/1', sleep => 0.4));
+like($body, qr/^X+$/m, 'no pipe bufs - body');
+is(length($body), 1024 * 1024, 'no pipe bufs - body length');
+
+# also with disabled proxy temp file
+
+$body = http_content(http_get('/off/1', sleep => 0.4));
+like($body, qr/^X+$/m, 'no temp file - body');
+is(length($body), 1024 * 1024, 'no temp file - body length');
+
+###############################################################################