new file mode 100644
--- /dev/null
+++ b/debug_connection_unix.t
@@ -0,0 +1,73 @@
+#!/usr/bin/perl
+
+# (C) Nginx, Inc.
+
+# Tests for debug_connection with unix socket.
+
+###############################################################################
+
+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 $t = Test::Nginx->new()->has(qw/http --with-debug unix proxy/);
+
+$t->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+    debug_connection unix:;
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    error_log %%TESTDIR%%/debug1.log alert;
+    error_log %%TESTDIR%%/debug2.log alert;
+
+    server {
+        listen       127.0.0.1:8080;
+        listen       unix:%%TESTDIR%%/unix.sock;
+        server_name  localhost;
+
+        location /debug {
+            proxy_pass http://unix:%%TESTDIR%%/unix.sock:/;
+        }
+    }
+}
+
+EOF
+
+$t->try_run('no unix support')->plan(5);
+
+###############################################################################
+
+http_get('/');
+
+select undef, undef, undef, 0.1;
+is($t->read_file('debug1.log'), '', 'no debug_connection file 1');
+is($t->read_file('debug2.log'), '', 'no debug_connection file 2');
+
+http_get('/debug');
+
+select undef, undef, undef, 0.1;
+like($t->read_file('debug1.log'), qr/\[debug\]/, 'debug_connection file 1');
+like($t->read_file('debug2.log'), qr/\[debug\]/, 'debug_connection file 2');
+is($t->read_file('debug1.log'), $t->read_file('debug2.log'),
+	'debug_connection file1 file2 match');
+
+###############################################################################