Test: fix pingpong.t to align with stream route validation and add cleanup. Fixed status code check in pingpong test to ensure correct error message is output when 400 error is returned

1. Update TEST 15 to expect 400 when creating a route with a non-existent superior_id, reflecting the new validation logic.
2. Add TEST 22 to clean up created stream routes after tests to prevent Etcd data pollution affecting subsequent tests (e.g., redis.t).

Signed-off-by: Orician <[email protected]>

Author: yixianOu

t/admin/stream-routes-subordinate.t

@@ -147,7 +147,7 @@ passed
                     }
                 }]]
             )
-            
+
             local code, body = t('/apisix/admin/stream_routes/5',
                 ngx.HTTP_PUT,
                 [[{

t/xrpc/pingpong.t

@@ -510,9 +510,9 @@ call pingpong's log, ctx unfinished: false
                     }
                 }
             )
-            if code >= 300 then
+            if code ~= 400 then
                 ngx.status = code
-                ngx.say(body)
+                ngx.say("expected 400 for invalid superior_id, got " .. code .. ": " .. body)
                 return
             end
 
@@ -779,3 +779,47 @@ qr/connect to \S+ while prereading client data/
 connect to 127.0.0.3:1995 while prereading client data
 connect to 127.0.0.1:1995 while prereading client data
 --- stream_conf_enable
+
+=== TEST 22: cleanup
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin").test
+            
+            -- Delete dependent routes first
+            local code, body = t('/apisix/admin/stream_routes/2', ngx.HTTP_DELETE)
+            if code >= 300 then
+                ngx.status = code
+                ngx.say(body)
+                return
+            end
+
+            local code, body = t('/apisix/admin/stream_routes/3', ngx.HTTP_DELETE)
+            if code >= 300 then
+                ngx.status = code
+                ngx.say(body)
+                return
+            end
+
+            local code, body = t('/apisix/admin/stream_routes/5', ngx.HTTP_DELETE)
+            if code >= 300 then
+                ngx.status = code
+                ngx.say(body)
+                return
+            end
+
+            -- Then delete the superior route
+            local code, body = t('/apisix/admin/stream_routes/1', ngx.HTTP_DELETE)
+            if code >= 300 then
+                ngx.status = code
+                ngx.say(body)
+                return
+            end
+
+            ngx.say("passed")
+        }
+    }
+--- request
+GET /t
+--- response_body
+passed