From 2988ea61052b68d8da0fe4f6b4540c30306a1b27 Mon Sep 17 00:00:00 2001
From: Markus Schirp <mbj@schirp-dso.com>
Date: Tue, 15 Oct 2024 00:30:24 +0000
Subject: [PATCH] Fix zombifier on memoized methods

* When mutant runs zombified (for self tests) the `Zombie::Mutant` namespace tests
  the `Mutant` namespace.
* So when the `Zombie::Mutant` runs it has to be able to reference the "regular" `Adamantium` not the
  zombified when testing if a memoized method has to be unwound.
---
 Changelog.md                          | 6 ++++++
 lib/mutant/matcher/method/instance.rb | 6 +++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/Changelog.md b/Changelog.md
index ed2128f27..c167eede4 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,9 @@
+# v0.12.5 unreleased
+
+* [#1458](https://github.com/mbj/mutant/pull/1458)
+
+  Fix zombifier on memoized methods (only relevant for mutant developers).
+
 # v0.12.4 2024-06-30
 
 * [#1455](https://github.com/mbj/mutant/pull/1455)
diff --git a/lib/mutant/matcher/method/instance.rb b/lib/mutant/matcher/method/instance.rb
index 7df4b71de..fde76fb4a 100644
--- a/lib/mutant/matcher/method/instance.rb
+++ b/lib/mutant/matcher/method/instance.rb
@@ -30,8 +30,12 @@ def self.new(scope:, target_method:)
         end
         # rubocop:enable Metrics/MethodLength
 
+        TARGET_MEMOIZER = ::Mutant::Adamantium
+
+        private_constant(*constants(false))
+
         def self.memoized_method?(scope, method_name)
-          scope.raw < Adamantium && scope.raw.memoized?(method_name)
+          scope.raw < TARGET_MEMOIZER && scope.raw.memoized?(method_name)
         end
         private_class_method :memoized_method?