spec for Symbol#name to return _same String instance_

Author: lxxxvi

core/symbol/name_spec.rb

@@ -2,13 +2,17 @@
 
 ruby_version_is "3.0" do
   describe "Symbol#name" do
-    it "returns a string" do
+    it "returns string" do
       :ruby.name.should == "ruby"
       :ルビー.name.should == "ルビー"
-      :"ruby_#{1+2}".name.should == "ruby_3"
     end
 
-    it "returns a frozen string" do
+    it "returns same string instance" do
+      :"ruby_3".name.should.equal?(:ruby_3.name)
+      :"ruby_#{1+2}".name.should.equal?(:ruby_3.name)
+    end
+
+    it "returns frozen string" do
       :symbol.name.should.frozen?
     end
   end