Add Mock.assert_called()

Issue #26323: Add assert_called() and assert_called_once() methods to
unittest.mock.Mock.
diff --git a/Misc/ACKS b/Misc/ACKS
index 0a67f39..a19e113 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1267,6 +1267,7 @@
 Constantina S.
 Patrick Sabin
 Sébastien Sablé
+Amit Saha
 Suman Saha
 Hajime Saitou
 George Sakkis
diff --git a/Misc/NEWS b/Misc/NEWS
index 45d8f2e..1e87de8 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -201,6 +201,9 @@
 Library
 -------
 
+- Issue #26323: Add Mock.assert_called() and Mock.assert_called_once()
+  methods to unittest.mock. Patch written by Amit Saha.
+
 - Issue #20589: Invoking Path.owner() and Path.group() on Windows now raise
   NotImplementedError instead of ImportError.