From b893879ff4a050dee9b8cae7bee478811d842c0c Mon Sep 17 00:00:00 2001
From: Nicolas Simonds <github@submedia.net>
Date: Thu, 14 Aug 2025 05:11:10 +0300
Subject: [PATCH] fix: make `dogpile.cache.memory` preserve its init parameters

Make the `MemoryBackend` behave like the others, and stop removing keys from the initialization dict.

Fixes: Issue #273

Closes: #274
Pull-request: https://github.com/sqlalchemy/dogpile.cache/pull/274
Pull-request-sha: 759dc77265470c1f7ffa6b4aebc97812b5f3b4ac

Change-Id: Ifd3f0d88b18a73a0ce287e1a514a6268daf157c4
---
 dogpile/cache/backends/memory.py   | 2 +-
 tests/cache/test_memory_backend.py | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/dogpile/cache/backends/memory.py b/dogpile/cache/backends/memory.py
index f62c9d4..0ace10b 100644
--- a/dogpile/cache/backends/memory.py
+++ b/dogpile/cache/backends/memory.py
@@ -50,7 +50,7 @@ class MemoryBackend(CacheBackend):
     """
 
     def __init__(self, arguments):
-        self._cache = arguments.pop("cache_dict", {})
+        self._cache = arguments.get("cache_dict", {})
 
     def get(self, key):
         return self._cache.get(key, NO_VALUE)
diff --git a/tests/cache/test_memory_backend.py b/tests/cache/test_memory_backend.py
index 48a316f..fda2739 100644
--- a/tests/cache/test_memory_backend.py
+++ b/tests/cache/test_memory_backend.py
@@ -4,6 +4,10 @@
 
 class MemoryBackendTest(_GenericBackendTestSuite):
     backend = "dogpile.cache.memory"
+    config_args = {"arguments": {"cache_dict": {}}}
+
+    def test_config_args_does_not_mutate(self):
+        assert "cache_dict" in self.config_args["arguments"]
 
 
 class MemoryBackendSerializerTest(
@@ -12,5 +16,5 @@ class MemoryBackendSerializerTest(
     pass
 
 
-class MemoryPickleBackendTest(_GenericBackendTestSuite):
+class MemoryPickleBackendTest(MemoryBackendTest):
     backend = "dogpile.cache.memory_pickle"