new file mode 100644
--- /dev/null
+++ b/scgi_cache.t
@@ -0,0 +1,147 @@
+#!/usr/bin/perl
+
+# (C) Maxim Dounin
+
+# Tests for scgi_cache.
+
+###############################################################################
+
+use warnings;
+use strict;
+
+use Test::More;
+use Socket qw/ CRLF /;
+
+BEGIN { use FindBin; chdir($FindBin::Bin); }
+
+use lib 'lib';
+use Test::Nginx;
+
+###############################################################################
+
+select STDERR; $| = 1;
+select STDOUT; $| = 1;
+
+eval { require SCGI; };
+plan(skip_all => 'SCGI not installed') if $@;
+
+my $t = Test::Nginx->new()->has(qw/http scgi cache/)->plan(10)
+	->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    scgi_cache_path  %%TESTDIR%%/cache  keys_zone=one:1m;
+    scgi_cache_key   $request_uri;
+
+    add_header       X-Cache-Status  $upstream_cache_status;
+
+    server {
+        listen       127.0.0.1:8080;
+        server_name  localhost;
+
+        location / {
+            scgi_pass 127.0.0.1:8081;
+            scgi_param SCGI 1;
+            scgi_param REQUEST_URI $uri;
+            scgi_cache one;
+        }
+    }
+}
+
+EOF
+
+$t->run_daemon(\&scgi_daemon);
+$t->run();
+
+###############################################################################
+
+like(http_get('/len'), qr/MISS/, 'length');
+like(http_get('/len'), qr/HIT/, 'length cached');
+
+like(http_get('/nolen'), qr/MISS/, 'no length');
+like(http_get('/nolen'), qr/HIT/, 'no length cached');
+
+like(http_get('/len/empty'), qr/MISS/, 'empty length');
+
+TODO: {
+local $TODO = 'not yet';
+
+like(http_get('/len/empty'), qr/HIT/, 'empty length cached');
+}
+
+like(http_get('/nolen/empty'), qr/MISS/, 'empty no length');
+like(http_get('/nolen/empty'), qr/HIT/, 'empty no length cached');
+
+like(http_get('/unfinished'), qr/MISS/, 'unfinished');
+like(http_get('/unfinished'), qr/MISS/, 'unfinished not cached');
+
+###############################################################################
+
+sub scgi_daemon {
+	my $server = IO::Socket::INET->new(
+		Proto => 'tcp',
+		LocalHost => '127.0.0.1:8081',
+		Listen => 5,
+		Reuse => 1
+	)
+		or die "Can't create listening socket: $!\n";
+
+	my $scgi = SCGI->new($server, blocking => 1);
+	my %count;
+
+	while (my $request = $scgi->accept()) {
+		$request->read_env();
+
+		my $uri = $request->env->{REQUEST_URI} || '';
+		my $c = $request->connection();
+
+		$count{$uri} ||= 0;
+		$count{$uri}++;
+
+		if ($uri eq '/len') {
+			$c->print(
+				"Content-Length: 9" . CRLF .
+				"Content-Type: text/html" . CRLF .
+				"Cache-Control: max-age=300" . CRLF . CRLF .
+				"test body"
+			);
+
+		} elsif ($uri eq '/nolen') {
+			$c->print(
+				"Content-Type: text/html" . CRLF .
+				"Cache-Control: max-age=300" . CRLF . CRLF .
+				"test body"
+			);
+
+		} elsif ($uri eq '/len/empty') {
+			$c->print(
+				"Content-Length: 0" . CRLF .
+				"Content-Type: text/html" . CRLF .
+				"Cache-Control: max-age=300" . CRLF . CRLF
+			);
+
+		} elsif ($uri eq '/nolen/empty') {
+			$c->print(
+				"Content-Type: text/html" . CRLF .
+				"Cache-Control: max-age=300" . CRLF . CRLF
+			);
+
+		} elsif ($uri eq '/unfinished') {
+			$c->print(
+				"Content-Length: 10" . CRLF .
+				"Content-Type: text/html" . CRLF .
+				"Cache-Control: max-age=300" . CRLF . CRLF
+			);
+		}
+	}
+}
+
+###############################################################################