diff --git a/tests/fixtures/smoke-testing.ts b/tests/fixtures/smoke-testing.ts
index eb09da28bd1f5aaf135e5668035ffb108ae3e0c1..eff6c877578a6dae30d642608368fd19ae65b88d 100644
--- a/tests/fixtures/smoke-testing.ts
+++ b/tests/fixtures/smoke-testing.ts
@@ -59,9 +59,10 @@ async function main () {
     await Promise.all(
       botList.map(bot => bot.start()),
     )
-    botList.forEach(
-      bot => console.info(`Wechaty v${bot.version()} smoking test passed.`),
-    )
+    for (const bot of botList) {
+      console.info(`Wechaty v${bot.version()} smoking test passed.`)
+      console.info('listenerCount(message) is', bot.listenerCount('message'))
+    }
   } catch (e) {
     console.error(e)
     // Error!