spacewander commented on a change in pull request #4515:
URL: https://github.com/apache/apisix/pull/4515#discussion_r668430011



##########
File path: t/stream-plugin/limit-conn.t
##########
@@ -0,0 +1,191 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+use t::APISIX 'no_plan';
+
+repeat_each(1);
+no_long_string();
+no_shuffle();
+no_root_location();
+
+
+add_block_preprocessor(sub {
+    my ($block) = @_;
+
+    if (!$block->error_log && !$block->no_error_log) {
+        $block->set_value("no_error_log", "[error]\n[alert]");
+    }
+
+    my $config = $block->config // <<_EOC_;
+    location /hit {
+        content_by_lua_block {
+            local sock = ngx.socket.tcp()
+            local ok, err = sock:connect("127.0.0.1", 1985)
+            if not ok then
+                ngx.log(ngx.ERR, "failed to connect: ", err)
+                return ngx.exit(503)
+            end
+
+            local bytes, err = sock:send("mmm")
+            if not bytes then
+                ngx.log(ngx.ERR, "send stream request error: ", err)
+                return ngx.exit(503)
+            end
+            local data, err = sock:receive("*a")
+            if not data then
+                sock:close()
+                return ngx.exit(503)
+            end
+            ngx.print(data)
+        }
+    }
+
+    location /test_concurrency {
+        content_by_lua_block {
+            local reqs = {}
+            for i = 1, 5 do
+                reqs[i] = { "/hit" }
+            end
+            local resps = { ngx.location.capture_multi(reqs) }
+            for i, resp in ipairs(resps) do
+                ngx.say(resp.status)
+            end
+        }
+    }
+_EOC_
+
+    $block->set_value("config", $config);
+
+    my $stream_upstream_code = $block->stream_upstream_code // <<_EOC_;
+            local sock = ngx.req.socket()
+            local data = sock:receive("1")
+            ngx.sleep(0.2)
+            ngx.say("hello world")
+_EOC_
+    $block->set_value("stream_upstream_code", $stream_upstream_code);
+});
+
+run_tests;
+
+__DATA__
+
+=== TEST 1: set route
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin").test
+            local code, body = t('/apisix/admin/upstreams/1',
+                ngx.HTTP_PUT,
+                [[{
+                    "nodes": {
+                        "127.0.0.1:1995": 1
+                    },
+                    "type": "roundrobin"
+                }]]
+                )
+
+            if code >= 300 then

Review comment:
       `code >= 300` acts as `err != nil`, since it is so widely used, we can 
keep using it.




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