From bff335cf7f90a0dc3aeafc199aaa81697d5f122b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adri=C3=A1n=20Chaves?= <adrian@chaves.io>
Date: Mon, 5 Aug 2019 15:47:58 +0200
Subject: [PATCH] Improve the error message in contract failures due to
 multiple missing fields

---
 scrapy/contracts/default.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scrapy/contracts/default.py b/scrapy/contracts/default.py
index 0f6bdbad2..7745959a7 100644
--- a/scrapy/contracts/default.py
+++ b/scrapy/contracts/default.py
@@ -86,4 +86,5 @@ class ScrapesContract(Contract):
             if isinstance(x, (BaseItem, dict)):
                 missing = [arg for arg in self.args if arg not in x]
                 if missing:
-                    raise ContractFail("'%s' field is missing" % " ".join(missing))
+                    raise ContractFail(
+                        "Missing fields: %s" % ", ".join(missing))