From f163ad22d3321cb9bb4e6cbaac5a723444641565 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Tue, 22 Mar 2022 14:31:44 -0700
Subject: [PATCH] bpo-2604: Make doctest.DocTestCase reset globs in teardown
 (GH-31932)
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Co-authored-by: Piet Delport
Co-authored-by: Hugo Lopes Tavares
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
(cherry picked from commit 7ba7eae50803b11766421cb8aae1780058a57e2b)

Co-authored-by: Daniël van Noord <13665637+DanielNoord@users.noreply.github.com>
---
 Lib/doctest.py                                   |  3 +++
 Lib/test/test_doctest.py                         | 16 ++++++++++++++++
 .../2022-03-16-18-25-19.bpo-2604.jeopdL.rst      |  1 +
 3 files changed, 20 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2022-03-16-18-25-19.bpo-2604.jeopdL.rst

diff --git a/Lib/doctest.py b/Lib/doctest.py
index b27cbdfed46f..67cc34347bdf 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -2171,6 +2171,7 @@ class DocTestCase(unittest.TestCase):
         unittest.TestCase.__init__(self)
         self._dt_optionflags = optionflags
         self._dt_checker = checker
+        self._dt_globs = test.globs.copy()
         self._dt_test = test
         self._dt_setUp = setUp
         self._dt_tearDown = tearDown
@@ -2187,7 +2188,9 @@ class DocTestCase(unittest.TestCase):
         if self._dt_tearDown is not None:
             self._dt_tearDown(test)
 
+        # restore the original globs
         test.globs.clear()
+        test.globs.update(self._dt_globs)
 
     def runTest(self):
         test = self._dt_test
diff --git a/Lib/test/test_doctest.py b/Lib/test/test_doctest.py
index 9703f871ad64..1098a7b9f471 100644
--- a/Lib/test/test_doctest.py
+++ b/Lib/test/test_doctest.py
@@ -3126,6 +3126,22 @@ def test_no_trailing_whitespace_stripping():
     """
 
 
+def test_run_doctestsuite_multiple_times():
+    """
+    It was not possible to run the same DocTestSuite multiple times
+    http://bugs.python.org/issue2604
+    http://bugs.python.org/issue9736
+
+    >>> import unittest
+    >>> import test.sample_doctest
+    >>> suite = doctest.DocTestSuite(test.sample_doctest)
+    >>> suite.run(unittest.TestResult())
+    <unittest.result.TestResult run=9 errors=0 failures=4>
+    >>> suite.run(unittest.TestResult())
+    <unittest.result.TestResult run=9 errors=0 failures=4>
+    """
+
+
 def load_tests(loader, tests, pattern):
     tests.addTest(doctest.DocTestSuite(doctest))
     tests.addTest(doctest.DocTestSuite())
diff --git a/Misc/NEWS.d/next/Library/2022-03-16-18-25-19.bpo-2604.jeopdL.rst b/Misc/NEWS.d/next/Library/2022-03-16-18-25-19.bpo-2604.jeopdL.rst
new file mode 100644
index 000000000000..c0fd000b2c66
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2022-03-16-18-25-19.bpo-2604.jeopdL.rst
@@ -0,0 +1 @@
+Fix bug where doctests using globals would fail when run multiple times.
-- 
2.47.3