From df3b5557d176744967e1fef42c25c765794d2a32 Mon Sep 17 00:00:00 2001
From: Victor Maryama <victor.maryama@typhoon-hil.com>
Date: Wed, 9 Jan 2019 12:51:04 +0100
Subject: [PATCH] Reseting entered state in WarningsRecorder (fixes 4617)

---
 src/_pytest/recwarn.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/_pytest/recwarn.py b/src/_pytest/recwarn.py
index f39f7aee7..da408a892 100644
--- a/src/_pytest/recwarn.py
+++ b/src/_pytest/recwarn.py
@@ -192,6 +192,10 @@ class WarningsRecorder(warnings.catch_warnings):
             warnings.warn = self._saved_warn
         super(WarningsRecorder, self).__exit__(*exc_info)
 
+        # Built-in catch_warnings does not reset entered state so we do it
+        # manually here for this context manager to become reusable
+        self._entered = False
+
 
 class WarningsChecker(WarningsRecorder):
     def __init__(self, expected_warning=None, match_expr=None):