new file mode 100644
--- /dev/null
+++ b/sub_filter_ssi.t
@@ -0,0 +1,92 @@
+#!/usr/bin/perl
+
+# (C) Maxim Dounin
+
+# Tests for sub filter and subrequests.
+
+###############################################################################
+
+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;
+
+my $t = Test::Nginx->new()->has(qw/http sub ssi xslt/)->plan(2)
+	->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    types {
+        text/html html;
+        text/xml  xml;
+    }
+
+    server {
+        listen       127.0.0.1:8080;
+        server_name  localhost;
+
+        location / {
+            ssi on;
+            sub_filter notfoo bar;
+        }
+
+        location /xslt {
+            ssi on;
+            sub_filter_types *;
+            sub_filter root>foo bar;
+            xslt_stylesheet test.xslt;
+        }
+    }
+}
+
+EOF
+
+$t->write_file('index.html', '<!--#include virtual="/not.html" --> truncated');
+$t->write_file('not.html', 'response is not');
+
+$t->write_file('xslt.html', '<!--#include virtual="/xslt.xml" --> truncated');
+$t->write_file('xslt.xml', '<root>test</root>');
+$t->write_file('test.xslt', <<'EOF');
+
+<xsl:stylesheet version="1.0"
+                xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
+<xsl:output method="html"/>
+<xsl:strip-space elements="*"/>
+<xsl:template match="/">response is not</xsl:template>
+</xsl:stylesheet>
+
+EOF
+
+$t->run();
+
+###############################################################################
+
+TODO: {
+local $TODO = 'not yet';
+
+like(http_get('/index.html'), qr/not truncated/, 'subrequest partial match');
+like(http_get('/xslt.html'), qr/not.*truncated/ms, 'partial match and xslt');
+
+}
+
+###############################################################################