diff --git a/t/12-max-readers.t b/t/12-max-readers.t
new file mode 100644
index 0000000..0391e25
--- /dev/null
+++ b/t/12-max-readers.t
@@ -0,0 +1,58 @@
+# vim:set ft= ts=4 sw=4 et:
+
+use Test::Nginx::Socket::Lua;
+use Cwd qw(cwd);
+
+repeat_each(2);
+
+plan tests => repeat_each() * blocks() * 5;
+
+my $pwd = cwd();
+
+our $MainConfig = qq{
+    lmdb_environment_path /tmp/test.mdb;
+    lmdb_map_size 5m;
+};
+
+our $HttpConfig = qq{
+    lua_package_path "$pwd/lib/?.lua;;";
+
+    init_worker_by_lua_block {
+        local lmdb_set = require("resty.lmdb").set
+        lmdb_set("worker" .. ngx.worker.id(), tostring(ngx.worker.id()))
+    }
+};
+
+no_long_string();
+#no_diff();
+
+master_process_enabled('on');
+workers(200);
+
+run_tests();
+
+__DATA__
+
+=== TEST 1: simple set() / get()
+--- http_config eval: $::HttpConfig
+--- main_config eval: $::MainConfig
+--- config
+    location = /t {
+        content_by_lua_block {
+            local l = require("resty.lmdb")
+
+            ngx.say(l.set("test", "value"))
+            ngx.say(l.get("test"))
+            ngx.say(l.get("test_not_exist"))
+        }
+    }
+--- request
+GET /t
+--- response_body
+true
+value
+nil
+--- no_error_log
+[error]
+[warn]
+[crit]