diff --git a/tests/modsecurity-config-merge.t b/tests/modsecurity-config-merge.t
new file mode 100644
index 0000000..92c9698
--- /dev/null
+++ b/tests/modsecurity-config-merge.t
@@ -0,0 +1,235 @@
+#!/usr/bin/perl
+
+# (C) Andrei Belov
+
+# Tests for ModSecurity-nginx connector (configuration merge).
+
+###############################################################################
+
+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 $t = Test::Nginx->new()->has(qw/http proxy/);
+
+$t->write_file_expand('nginx.conf', <<'EOF');
+
+%%TEST_GLOBALS%%
+
+daemon off;
+
+events {
+}
+
+http {
+    %%TEST_GLOBALS_HTTP%%
+
+    modsecurity on;
+    modsecurity_rules '
+        SecRuleEngine On
+        SecRequestBodyAccess On
+        SecRequestBodyLimit 128
+        SecRequestBodyLimitAction Reject
+        SecRule REQUEST_BODY "@rx BAD BODY" "id:11,phase:request,deny,log,status:403"
+    ';
+
+    server {
+        listen       127.0.0.1:%%PORT_8080%%;
+        server_name  localhost;
+
+        location / {
+            proxy_pass http://127.0.0.1:%%PORT_8081%%;
+        }
+
+        location /modsec-disabled {
+            modsecurity_rules '
+                SecRuleEngine Off
+            ';
+            proxy_pass http://127.0.0.1:%%PORT_8081%%;
+        }
+
+        location /nobodyaccess {
+            modsecurity_rules '
+                SecRequestBodyAccess Off
+            ';
+            proxy_pass http://127.0.0.1:%%PORT_8081%%;
+        }
+
+        location /bodylimitprocesspartial {
+            modsecurity_rules '
+                SecRequestBodyLimitAction ProcessPartial
+            ';
+            proxy_pass http://127.0.0.1:%%PORT_8081%%;
+        }
+
+        location /bodylimitincreased {
+            modsecurity_rules '
+                SecRequestBodyLimit 512
+            ';
+            proxy_pass http://127.0.0.1:%%PORT_8081%%;
+        }
+
+        location /server {
+            modsecurity off;
+
+            location /server/modsec-disabled {
+                proxy_pass http://127.0.0.1:%%PORT_8082%%;
+            }
+
+            location /server/nobodyaccess {
+                proxy_pass http://127.0.0.1:%%PORT_8083%%;
+            }
+
+            location /server/bodylimitprocesspartial {
+                proxy_pass http://127.0.0.1:%%PORT_8084%%;
+            }
+
+            location /server/bodylimitincreased {
+                proxy_pass http://127.0.0.1:%%PORT_8085%%;
+            }
+        }
+    }
+
+    server {
+        listen 127.0.0.1:%%PORT_8082%%;
+
+        modsecurity_rules '
+                SecRuleEngine Off
+        ';
+
+        location / {
+            proxy_pass http://127.0.0.1:%%PORT_8081%%;
+        }
+    }
+
+    server {
+        listen 127.0.0.1:%%PORT_8083%%;
+
+        modsecurity_rules '
+                SecRequestBodyAccess Off
+        ';
+
+        location / {
+            proxy_pass http://127.0.0.1:%%PORT_8081%%;
+        }
+    }
+
+    server {
+        listen 127.0.0.1:%%PORT_8084%%;
+
+        modsecurity_rules '
+                SecRequestBodyLimitAction ProcessPartial
+        ';
+
+        location / {
+            proxy_pass http://127.0.0.1:%%PORT_8081%%;
+        }
+    }
+
+    server {
+        listen 127.0.0.1:%%PORT_8085%%;
+
+        modsecurity_rules '
+                SecRequestBodyLimit 512
+        ';
+
+        location / {
+            proxy_pass http://127.0.0.1:%%PORT_8081%%;
+        }
+    }
+}
+EOF
+
+$t->run_daemon(\&http_daemon);
+$t->run()->waitforsocket('127.0.0.1:' . port(8081));
+
+$t->plan(10);
+
+###############################################################################
+
+like(http_get_body('/', 'GOOD BODY'), qr/TEST-OK-IF-YOU-SEE-THIS/, "http level defaults, pass");
+like(http_get_body('/', 'VERY BAD BODY'), qr/403 Forbidden/, "http level defaults, block");
+
+TODO: {
+local $TODO = 'not yet, see https://github.com/SpiderLabs/ModSecurity/pull/1990';
+
+like(http_get_body('/modsec-disabled', 'VERY BAD BODY'), qr/TEST-OK-IF-YOU-SEE-THIS/, "location override for SecRuleEngine, pass");
+like(http_get_body('/nobodyaccess', 'VERY BAD BODY'), qr/TEST-OK-IF-YOU-SEE-THIS/, "location override for SecRequestBodyAccess, pass");
+like(http_get_body('/bodylimitprocesspartial', 'BODY' x 33), qr/TEST-OK-IF-YOU-SEE-THIS/, "location override for SecRequestBodyLimitAction, pass");
+like(http_get_body('/bodylimitincreased', 'BODY' x 64), qr/TEST-OK-IF-YOU-SEE-THIS/, "location override for SecRequestBodyLimit, pass");
+
+like(http_get_body('/server/modsec-disabled', 'VERY BAD BODY'), qr/TEST-OK-IF-YOU-SEE-THIS/, "server override for SecRuleEngine, pass");
+like(http_get_body('/server/nobodyaccess', 'VERY BAD BODY'), qr/TEST-OK-IF-YOU-SEE-THIS/, "server override for SecRequestBodyAccess, pass");
+like(http_get_body('/server/bodylimitprocesspartial', 'BODY' x 33), qr/TEST-OK-IF-YOU-SEE-THIS/, "server override for SecRequestBodyLimitAction, pass");
+like(http_get_body('/server/bodylimitincreased', 'BODY' x 64), qr/TEST-OK-IF-YOU-SEE-THIS/, "server override for SecRequestBodyLimit, pass");
+}
+
+###############################################################################
+
+sub http_daemon {
+	my $server = IO::Socket::INET->new(
+		Proto => 'tcp',
+		LocalHost => '127.0.0.1:' . port(8081),
+		Listen => 5,
+		Reuse => 1
+	)
+		or die "Can't create listening socket: $!\n";
+
+	local $SIG{PIPE} = 'IGNORE';
+
+	while (my $client = $server->accept()) {
+		$client->autoflush(1);
+
+		my $headers = '';
+		my $uri = '';
+
+		while (<$client>) {
+			$headers .= $_;
+			last if (/^\x0d?\x0a?$/);
+		}
+
+		$uri = $1 if $headers =~ /^\S+\s+([^ ]+)\s+HTTP/i;
+
+		print $client <<'EOF';
+HTTP/1.1 200 OK
+Connection: close
+
+EOF
+		print $client "TEST-OK-IF-YOU-SEE-THIS"
+			unless $headers =~ /^HEAD/i;
+
+		close $client;
+	}
+}
+
+sub http_get_body {
+	my $uri = shift;
+	my $last = pop;
+	return http( join '', (map {
+		my $body = $_;
+		"GET $uri HTTP/1.1" . CRLF
+		. "Host: localhost" . CRLF
+		. "Content-Length: " . (length $body) . CRLF . CRLF
+		. $body
+	} @_),
+		"GET $uri HTTP/1.1" . CRLF
+		. "Host: localhost" . CRLF
+		. "Connection: close" . CRLF
+		. "Content-Length: " . (length $last) . CRLF . CRLF
+		. $last
+	);
+}
+
+###############################################################################