new file mode 100644
--- /dev/null
+++ b/error_log.t
@@ -0,0 +1,197 @@
+#!/usr/bin/perl
+
+# (C) Nginx, Inc
+
+# Tests for error_log.
+# Various log levels emitted with limit_req_log_level.
+
+###############################################################################
+
+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 limit_req/);
+
+plan(skip_all => 'not yet') unless $t->has_version('1.5.2');
+
+$t->plan(25)->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    limit_req_zone $binary_remote_addr zone=one:10m rate=1r/m;
+    limit_req zone=one;
+
+    server {
+        listen       127.0.0.1:8080;
+        server_name  localhost;
+
+        location /debug {
+            error_log %%TESTDIR%%/e_debug_debug.log debug;
+            error_log %%TESTDIR%%/e_debug_info.log info;
+            error_log stderr debug;
+        }        
+        location /info {
+            limit_req_log_level info;
+            error_log %%TESTDIR%%/e_info_debug.log debug;
+            error_log %%TESTDIR%%/e_info_info.log info;
+            error_log %%TESTDIR%%/e_info_notice.log notice;
+            error_log stderr info;
+        }
+        location /notice {
+            limit_req_log_level notice;
+            error_log %%TESTDIR%%/e_notice_info.log info;
+            error_log %%TESTDIR%%/e_notice_notice.log notice;
+            error_log %%TESTDIR%%/e_notice_warn.log warn;
+            error_log stderr notice;
+        }
+        location /warn {
+            limit_req_log_level warn;
+            error_log %%TESTDIR%%/e_warn_notice.log notice;
+            error_log %%TESTDIR%%/e_warn_warn.log warn;
+            error_log %%TESTDIR%%/e_warn_error.log error;
+            error_log stderr warn;
+        }
+        location /error {
+            error_log %%TESTDIR%%/e_error_warn.log warn;
+            error_log %%TESTDIR%%/e_error_error.log;
+            error_log %%TESTDIR%%/e_error_alert.log alert;
+            error_log stderr;
+        }
+
+        location /file_low {
+            error_log %%TESTDIR%%/e_multi_low.log warn;
+            error_log %%TESTDIR%%/e_multi_low.log;
+        }
+        location /file_dup {
+            error_log %%TESTDIR%%/e_multi.log;
+            error_log %%TESTDIR%%/e_multi.log;
+        }
+        location /file_high {
+            error_log %%TESTDIR%%/e_multi_high.log emerg;
+            error_log %%TESTDIR%%/e_multi_high.log;
+        }
+
+        location /stderr_low {
+            error_log stderr warn;
+            error_log stderr;
+        }
+        location /stderr_dup {
+            error_log stderr;
+            error_log stderr;
+        }
+        location /stderr_high {
+            error_log stderr emerg;
+            error_log stderr;
+        }
+    }
+}
+
+EOF
+
+open OLDERR, ">&", \*STDERR;
+open STDERR, '>', $t->testdir() . '/stderr' or die "Can't reopen STDERR: $!";
+open my $stderr, '<', $t->testdir() . '/stderr'
+	or die "Can't open stderr file: $!";
+
+$t->run();
+
+open STDERR, ">&", \*OLDERR;
+
+###############################################################################
+
+# charge limit_req
+
+http_get('/');
+
+SKIP: {
+
+skip "no --with-debug", 3 unless $t->has_module('--with-debug');
+
+http_get('/debug');
+isnt(lines($t, 'e_debug_debug.log', '[debug]'), 0, 'file debug debug');
+is(lines($t, 'e_debug_info.log', '[debug]'), 0, 'file debug info');
+isnt(lines($t, 'stderr', '[debug]'), 0, 'stderr debug');
+
+}
+
+http_get('/info');
+is(lines($t, 'e_info_debug.log', '[info]'), 1, 'file info debug');
+is(lines($t, 'e_info_info.log', '[info]'), 1, 'file info info');
+is(lines($t, 'e_info_notice.log', '[info]'), 0, 'file info notice');
+is(lines($t, 'stderr', '[info]'), 1, 'stderr info');
+
+http_get('/notice');
+is(lines($t, 'e_notice_info.log', '[notice]'), 1, 'file notice info');
+is(lines($t, 'e_notice_notice.log', '[notice]'), 1, 'file notice notice');
+is(lines($t, 'e_notice_warn.log', '[notice]'), 0, 'file notice warn');
+is(lines($t, 'stderr', '[notice]'), 1, 'stderr notice');
+
+http_get('/warn');
+is(lines($t, 'e_warn_notice.log', '[warn]'), 1, 'file warn notice');
+is(lines($t, 'e_warn_warn.log', '[warn]'), 1, 'file warn warn');
+is(lines($t, 'e_warn_error.log', '[warn]'), 0, 'file warn error');
+is(lines($t, 'stderr', '[warn]'), 1, 'stderr warn');
+
+http_get('/error');
+is(lines($t, 'e_error_warn.log', '[error]'), 1, 'file error warn');
+is(lines($t, 'e_error_error.log', '[error]'), 1, 'file error error');
+is(lines($t, 'e_error_alert.log', '[error]'), 0, 'file error alert');
+is(lines($t, 'stderr', '[error]'), 1, 'stderr error');
+
+# count log messages emitted with various error_log levels
+
+http_get('/file_low');
+is(lines($t, 'e_multi_low.log', '[error]'), 2, 'file low');
+
+http_get('/file_dup');
+is(lines($t, 'e_multi.log', '[error]'), 2, 'file dup');
+
+http_get('/file_high');
+is(lines($t, 'e_multi_high.log', '[error]'), 1, 'file high');
+
+http_get('/stderr_low');
+is(lines($t, 'stderr', '[error]'), 2, 'stderr low');
+
+http_get('/stderr_dup');
+is(lines($t, 'stderr', '[error]'), 2, 'stderr dup');
+
+http_get('/stderr_high');
+is(lines($t, 'stderr', '[error]'), 1, 'stderr high');
+
+###############################################################################
+
+sub lines {
+	my ($t, $file, $pattern) = @_;
+
+	if ($file eq 'stderr') {
+		return map { $_ =~ /\Q$pattern\E/ } (<$stderr>);
+	}
+
+	my $path = $t->testdir() . '/' . $file;
+	open my $fh, '<', $path or return "$!";
+	my $value = map { $_ =~ /\Q$pattern\E/ } (<$fh>);
+	close $fh;
+	return $value;
+}
+
+###############################################################################