bpo-39932: Fix multiprocessing test_heap() (GH-19690)

vstinner · web-flow · commit 857d573257ab · 2020-04-24T00:20:00.000+02:00
bpo-32759, bpo-39932: Fix multiprocessing test_heap(): a new Heap object is now created for each test run. Partial backport of commit e4679cd by Antoine Pitrou.
diff --git a/Lib/test/_test_multiprocessing.py b/Lib/test/_test_multiprocessing.py
@@ -3424,6 +3424,16 @@ class _TestHeap(BaseTestCase):
 
     ALLOWED_TYPES = ('processes',)
 
+    def setUp(self):
+        super().setUp()
+        # Make pristine heap for these tests
+        self.old_heap = multiprocessing.heap.BufferWrapper._heap
+        multiprocessing.heap.BufferWrapper._heap = multiprocessing.heap.Heap()
+
+    def tearDown(self):
+        multiprocessing.heap.BufferWrapper._heap = self.old_heap
+        super().tearDown()
+
     def test_heap(self):
         iterations = 5000
         maxblocks = 50
diff --git a/Misc/NEWS.d/next/Tests/2020-04-23-23-46-08.bpo-39932.6G8rRN.rst b/Misc/NEWS.d/next/Tests/2020-04-23-23-46-08.bpo-39932.6G8rRN.rst
@@ -0,0 +1,2 @@
+Fix multiprocessing test_heap(): a new Heap object is now created for each test
+run.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+Fix multiprocessing test_heap(): a new Heap object is now created for each test`
	`2`	`+run.`