From 2f74376e7e42cfdcd5cc19b4e2f3c455d1fa2966 Mon Sep 17 00:00:00 2001
From: Alistair Coles <alistairncoles@gmail.com>
Date: Fri, 7 Mar 2025 12:29:28 +0000
Subject: [PATCH] Make FakeSwiftCall.DUMMY_VALUE a bespoke singleton

In test assertion failure messages the DUMMY_VALUE would be shown as
<object object ...> which is not immediately recognisable as the dummy
value..

This change makes the DUMMY_VALUE show as
<test.unit.common.middleware.helpers.FakeSwiftDummyValue object ...>.

Change-Id: I73fac245c65c48d45e4919c6f15688d482148407
Related-Change: I332ce724aa10287800cbec8ca21aacc3bbd3c22a
---
 test/unit/common/middleware/helpers.py | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/test/unit/common/middleware/helpers.py b/test/unit/common/middleware/helpers.py
index ce0ed8b86c..bd844f4097 100644
--- a/test/unit/common/middleware/helpers.py
+++ b/test/unit/common/middleware/helpers.py
@@ -51,11 +51,21 @@ class LeakTrackingIter(object):
         self.mark_closed(self.key)
 
 
+class FakeSwiftDummyValue:
+    _instance = None
+
+    @classmethod
+    def singleton(cls):
+        if not cls._instance:
+            cls._instance = FakeSwiftDummyValue()
+        return cls._instance
+
+
 class FakeSwiftCall(object):
     """
     Encapsulate properties of a request captured by FakeSwift.
     """
-    DUMMY_VALUE = object()
+    DUMMY_VALUE = FakeSwiftDummyValue.singleton()
 
     def __init__(self, req):
         self.req = req