diff --git a/t/00-filter.t b/t/00-filter.t
index 1e48098..dc5222e 100644
--- a/t/00-filter.t
+++ b/t/00-filter.t
@@ -1,8 +1,279 @@
-use Test::Nginx::Socket::Lua;
+use Test::Nginx::Socket;
+use File::Basename;
+use lib 'lib';
+
+my $dirname = dirname(__FILE__);
+$ENV{'TEST_NGINX_PERL_PATH'}="$ENV{'PWD'}/$dirname";
 
 no_long_string();
+log_level 'debug';
+repeat_each(3);
+plan tests => repeat_each() * (blocks() * 3) + 45;
 run_tests();
 
+
 __DATA__
 
 
+=== TEST 1: zstd off
+--- config
+	location /filter {
+		zstd off;
+		proxy_pass http://127.0.0.1:$TEST_NGINX_SERVER_PORT/test;
+	}
+	location /test {
+		root $TEST_NGINX_PERL_PATH/suite/;
+	}
+--- request
+GET /filter
+--- response_headers
+Content-Length: 59738
+!Content-Encoding
+--- no_error_log
+[error]
+
+
+=== TEST 2: zstd off (with accept-encoding header)
+--- config
+    location /filter {
+        zstd off;
+        proxy_pass http://127.0.0.1:$TEST_NGINX_SERVER_PORT/test;
+    }
+    location /test {
+        root $TEST_NGINX_PERL_PATH/suite/;
+    }
+--- request
+GET /filter
+Accept-Encoding: gzip,zstd
+--- response_headers
+Content-Length: 59738
+!Content-Encoding
+--- no_error_log
+[error]
+
+
+
+=== TEST 3: zstd on
+--- config
+    location /filter {
+        zstd on;
+		zstd_types text/plain;
+        proxy_pass http://127.0.0.1:$TEST_NGINX_SERVER_PORT/test;
+    }
+    location /test {
+        root $TEST_NGINX_PERL_PATH/suite/;
+    }
+--- request
+GET /filter
+--- more_headers
+Accept-Encoding: gzip, zstd
+--- response_headers
+!Content-Length
+Transfer-Encoding: chunked
+Content-Encoding: zstd
+--- no_error_log
+[error]
+
+
+
+=== TEST 4: zstd on (without accept-encoding header)
+--- config
+    location /filter {
+        zstd on;
+		zstd_types text/plain;
+        proxy_pass http://127.0.0.1:$TEST_NGINX_SERVER_PORT/test;
+    }
+    location /test {
+        root $TEST_NGINX_PERL_PATH/suite/;
+    }
+--- request
+GET /filter
+--- response_headers
+Content-Length: 59738
+!Content-Encoding
+--- no_error_log
+[error]
+
+
+
+=== TEST 5: zstd on (without zstd component in accept-encoding header)
+--- config
+    location /filter {
+        zstd on;
+		zstd_types text/plain;
+        proxy_pass http://127.0.0.1:$TEST_NGINX_SERVER_PORT/test;
+    }
+    location /test {
+        root $TEST_NGINX_PERL_PATH/suite/;
+    }
+--- request
+GET /filter
+--- more_headers
+Accept-Encoding: gzip, br
+--- response_headers
+Content-Length: 59738
+!Content-Encoding
+--- no_error_log
+[error]
+
+
+
+=== TEST 6: zstd zstd_min_length (greater than min_length)
+--- config
+    location /filter {
+        zstd on;
+		zstd_min_length 1024;
+		zstd_types text/plain;
+        proxy_pass http://127.0.0.1:$TEST_NGINX_SERVER_PORT/test;
+    }
+    location /test {
+        root $TEST_NGINX_PERL_PATH/suite/;
+    }
+--- request
+GET /filter
+--- more_headers
+Accept-Encoding: zstd, br
+--- response_headers
+!Content-Length
+Transfer-Encoding: chunked
+Content-Encoding: zstd
+Content-type: text/plain
+--- no_error_log
+[error]
+
+
+
+=== TEST 7: zstd zstd_min_length (less than length)
+--- config
+    location /filter {
+        zstd on;
+		zstd_types text/plain;
+        zstd_min_length 60k;
+        proxy_pass http://127.0.0.1:$TEST_NGINX_SERVER_PORT/test;
+    }
+    location /test {
+        root $TEST_NGINX_PERL_PATH/suite/;
+    }
+--- request
+GET /filter
+--- more_headers
+Accept-Encoding: zstd, br
+--- response_headers
+Content-Length: 59738
+!Content-Encoding
+--- no_error_log
+[error]
+
+=== TEST 8 zstd & gzip
+--- config
+    location /filter {
+        zstd on;
+        zstd_min_length 1024;
+        zstd_types text/plain;
+
+		gzip on;
+		gzip_min_length 1024;
+		gzip_types text/plain;
+        proxy_pass http://127.0.0.1:$TEST_NGINX_SERVER_PORT/test;
+    }
+    location /test {
+        root $TEST_NGINX_PERL_PATH/suite/;
+    }
+--- request
+GET /filter
+--- more_headers
+Accept-Encoding: zstd, gzip, br
+--- response_headers
+!Content-Length
+Transfer-Encoding: chunked
+Content-Encoding: zstd
+Content-type: text/plain
+--- no_error_log
+[error]
+
+=== TEST 9 zstd & gzip (Accept-Encoding start with gzip)
+--- config
+    location /filter {
+        zstd on;
+        zstd_min_length 1024;
+        zstd_types text/plain;
+
+        gzip on;
+        gzip_min_length 1024;
+        gzip_types text/plain;
+        proxy_pass http://127.0.0.1:$TEST_NGINX_SERVER_PORT/test;
+    }
+    location /test {
+        root $TEST_NGINX_PERL_PATH/suite/;
+    }
+--- request
+GET /filter
+--- more_headers
+Accept-Encoding: gzip, zstd, br
+--- response_headers
+!Content-Length
+Transfer-Encoding: chunked
+Content-Encoding: zstd
+Content-type: text/plain
+--- no_error_log
+[error]
+
+=== TEST 10 zstd & gzip (hit gzip)
+--- config
+    location /filter {
+        zstd on;
+        zstd_min_length 60k;
+        zstd_types text/plain;
+
+        gzip on;
+        gzip_min_length 1024;
+        gzip_types text/plain;
+        proxy_pass http://127.0.0.1:$TEST_NGINX_SERVER_PORT/test;
+    }
+    location /test {
+        root $TEST_NGINX_PERL_PATH/suite/;
+    }
+--- request
+GET /filter
+--- more_headers
+Accept-Encoding: zstd, gzip, br
+--- response_headers
+!Content-Length
+Transfer-Encoding: chunked
+Content-Encoding: gzip
+Content-type: text/plain
+--- no_error_log
+[error]
+
+=== TEST 11 zstd on (file does not exist)
+--- config
+    location /filter {
+        zstd on;
+	zstd_types text/plain;
+        proxy_pass http://127.0.0.1:$TEST_NGINX_SERVER_PORT/test2;
+    }
+    location /test {
+        root $TEST_NGINX_PERL_PATH/suite/;
+    }
+--- request
+GET /filter
+--- more_headers
+Accept-Encoding: gzip, br
+--- error_code: 404
+
+
+
+=== TEST 12 zstd off (file does not exist)
+--- config
+    location /filter {
+        zstd off;
+        proxy_pass http://127.0.0.1:$TEST_NGINX_SERVER_PORT/test2;
+    }
+    location /test {
+        root $TEST_NGINX_PERL_PATH/suite/;
+    }
+--- request
+GET /filter
+--- more_headers
+Accept-Encoding: gzip, br
+--- error_code: 404