add test for clickhouse-logger to show that different endpoints will …

…be chosen randomly

t/plugin/clickhouse-logger.t

@@ -214,7 +214,38 @@ passed
 
 
 
-=== TEST 6: access local server
+=== TEST 6: to show that different endpoints will be chosen randomly
+--- config
+    location /t {
+        content_by_lua_block {
+            local code_count = {}
+            local t = require("lib.test_admin").test
+            for i = 1, 12 do
+                local code, body = t('/opentracing', ngx.HTTP_GET)
+                if code ~= 200 then
+                    ngx.say("code: ", code, " body: ", body)
+                end
+                code_count[code] = (code_count[code] or 0) + 1
+            end
+
+            local code_arr = {}
+            for code, count in pairs(code_count) do
+                table.insert(code_arr, {code = code, count = count})
+            end
+
+            ngx.say(require("toolkit.json").encode(code_arr))
+            ngx.exit(200)
+        }
+    }
+--- response_body
+[{"code":200,"count":12}]
+--- error_log
+sending a batch logs to http://127.0.0.1:1980/clickhouse_logger_server
+sending a batch logs to http://127.0.0.1:10420/clickhouse-logger/test1
+
+
+
+=== TEST 7: access local server
 --- request
 GET /opentracing
 --- response_body