Issue #20804: The unittest.mock.sentinel attributes now preserve their

identity when they are copied or pickled.

2 files changed, 11 insertions, 0 deletions

diff --git a/Doc/library/unittest.mock.rst b/Doc/library/unittest.mock.rst
index 3cc22fdde7..ca5c2bc787 100644
--- a/Doc/library/unittest.mock.rst
+++ b/Doc/library/unittest.mock.rst
@@ -1831,6 +1831,10 @@ sentinel
     the same attribute will always return the same object. The objects
     returned have a sensible repr so that test failure messages are readable.
 
+   .. versionchanged:: 3.7
+      The ``sentinel`` attributes now preserve their identity when they are
+      :mod:`copied <copy>` or :mod:`pickled <pickle>`.
+
 Sometimes when testing you need to test that a specific object is passed as an
 argument to another method, or returned. It can be common to create named
 sentinel objects to test this. :data:`sentinel` provides a convenient way of
diff --git a/Doc/whatsnew/3.7.rst b/Doc/whatsnew/3.7.rst
index 0d19f25942..a2e6422793 100644
--- a/Doc/whatsnew/3.7.rst
+++ b/Doc/whatsnew/3.7.rst
@@ -93,6 +93,13 @@ New Modules
 Improved Modules
 ================
 
+unittest.mock
+-------------
+
+The :const:`~unittest.mock.sentinel` attributes now preserve their identity
+when they are :mod:`copied <copy>` or :mod:`pickled <pickle>`.
+(Contributed by Serhiy Storchaka in :issue:`20804`.)
+
 
 Optimizations
 =============