From d94104b5644df764752d98783e1d35837da238b4 Mon Sep 17 00:00:00 2001
From: Sampo Kuokkanen <sampo.kuokkanen@gmail.com>
Date: Sun, 3 May 2026 18:11:47 +0900
Subject: [PATCH] Add specs for original_name with define_method

Verify that Method#original_name and UnboundMethod#original_name return the source UnboundMethod's name when a method is created via define_method, and that the original name is preserved through define_method and aliasing.
---
 core/method/original_name_spec.rb        | 15 +++++++++++++++
 core/unboundmethod/original_name_spec.rb | 15 +++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/core/method/original_name_spec.rb b/core/method/original_name_spec.rb
index 676fdaedb4..71cfb65656 100644
--- a/core/method/original_name_spec.rb
+++ b/core/method/original_name_spec.rb
@@ -19,4 +19,19 @@
     obj.method(:baz).original_name.should == :foo
     obj.method(:baz).unbind.bind(obj).original_name.should == :foo
   end
+
+  it "returns the source UnboundMethod's name (not the name given to define_method)" do
+    klass = Class.new { define_method(:my_inspect, ::Kernel.instance_method(:inspect)) }
+    klass.new.method(:my_inspect).original_name.should == :inspect
+  end
+
+  it "preserves the source method's name through define_method and alias" do
+    source = Class.new { def my_method; end }
+    klass = Class.new(source) do
+      define_method(:renamed, source.instance_method(:my_method))
+      alias aliased renamed
+    end
+    klass.new.method(:renamed).original_name.should == :my_method
+    klass.new.method(:aliased).original_name.should == :my_method
+  end
 end
diff --git a/core/unboundmethod/original_name_spec.rb b/core/unboundmethod/original_name_spec.rb
index 7280dcb2b4..e50ce28dd7 100644
--- a/core/unboundmethod/original_name_spec.rb
+++ b/core/unboundmethod/original_name_spec.rb
@@ -19,4 +19,19 @@
     obj.method(:baz).unbind.original_name.should == :foo
     UnboundMethodSpecs::Methods.instance_method(:baz).original_name.should == :foo
   end
+
+  it "returns the source UnboundMethod's name (not the name given to define_method)" do
+    klass = Class.new { define_method(:my_inspect, ::Kernel.instance_method(:inspect)) }
+    klass.instance_method(:my_inspect).original_name.should == :inspect
+  end
+
+  it "preserves the source method's name through define_method and alias" do
+    source = Class.new { def my_method; end }
+    klass = Class.new(source) do
+      define_method(:renamed, source.instance_method(:my_method))
+      alias aliased renamed
+    end
+    klass.instance_method(:renamed).original_name.should == :my_method
+    klass.instance_method(:aliased).original_name.should == :my_method
+  end
 end