From e2a0493e9808288ceae7e8d54e0d19d306f89223 Mon Sep 17 00:00:00 2001
From: Alex Gaynor <alex.gaynor@gmail.com>
Date: Wed, 4 Jul 2018 10:46:36 -0400
Subject: Fixes #4242 -- added an additional assert to make this test more
 resillient (#4308)

---
 tests/hazmat/primitives/test_ec.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tests/hazmat/primitives/test_ec.py b/tests/hazmat/primitives/test_ec.py
index 5c3da5b6..d015e84d 100644
--- a/tests/hazmat/primitives/test_ec.py
+++ b/tests/hazmat/primitives/test_ec.py
@@ -1080,6 +1080,8 @@ class TestECDH(object):
         # At this point fail indicates that one of the underlying keys was
         # changed. This results in a non-matching derived key.
         if vector['fail']:
+            # Errno 8 indicates Z should be changed.
+            assert vector['errno'] == 8
             assert z != vector['Z']
         else:
             assert z == vector['Z']
-- 
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