From b742384313630b4aa814c576b221454146ef0ebd Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Mon, 24 Aug 2020 21:23:08 -0400
Subject: [PATCH] test: improve expect.toHaveBeenWarned() message

---
 scripts/setupJestEnv.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/scripts/setupJestEnv.ts b/scripts/setupJestEnv.ts
index 381a404f76f..cccca10d57c 100644
--- a/scripts/setupJestEnv.ts
+++ b/scripts/setupJestEnv.ts
@@ -12,7 +12,10 @@ expect.extend({
       return {
         pass: false,
         message: () =>
-          `expected "${received}" to have been warned.\n\nActual messages:\n\n - ${msgs}`
+          `expected "${received}" to have been warned` +
+          (msgs.length
+            ? `.\n\nActual messages:\n\n - ${msgs}`
+            : ` but no warning was recorded.`)
       }
     }
   },