1 files changed, 18 insertions, 14 deletions
diff --git a/spec/ruby/core/string/uminus_spec.rb b/spec/ruby/core/string/uminus_spec.rb
index 800dca5044..43abf71d50 100644
--- a/spec/ruby/core/string/uminus_spec.rb
+++ b/spec/ruby/core/string/uminus_spec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 require_relative '../../spec_helper'
 
 describe 'String#-@' do
@@ -5,7 +6,7 @@ describe 'String#-@' do
     input  = 'foo'.freeze
     output = -input
 
-    output.should equal(input)
+    output.should.equal?(input)
     output.should.frozen?
   end
 
@@ -14,7 +15,7 @@ describe 'String#-@' do
     output = -input
 
     output.should.frozen?
-    output.should_not equal(input)
+    output.should_not.equal?(input)
     output.should == 'foo'
   end
 
@@ -22,28 +23,31 @@ describe 'String#-@' do
     origin = "this is a string"
     dynamic = %w(this is a string).join(' ')
 
-    origin.should_not equal(dynamic)
-    (-origin).should equal(-dynamic)
+    origin.should_not.equal?(dynamic)
+    (-origin).should.equal?(-dynamic)
   end
 
   it "returns the same object when it's called on the same String literal" do
-    (-"unfrozen string").should equal(-"unfrozen string")
-    (-"unfrozen string").should_not equal(-"another unfrozen string")
+    (-"unfrozen string").should.equal?(-"unfrozen string")
+    (-"unfrozen string").should_not.equal?(-"another unfrozen string")
   end
 
   it "deduplicates frozen strings" do
     dynamic = %w(this string is frozen).join(' ').freeze
 
-    dynamic.should_not equal("this string is frozen".freeze)
+    dynamic.should_not.equal?("this string is frozen".freeze)
 
-    (-dynamic).should equal("this string is frozen".freeze)
-    (-dynamic).should equal(-"this string is frozen".freeze)
+    (-dynamic).should.equal?("this string is frozen".freeze)
+    (-dynamic).should.equal?((-"this string is frozen").freeze)
   end
 
-  ruby_version_is "3.0" do
-    it "interns the provided string if it is frozen" do
-      dynamic = "this string is unique and frozen #{rand}".freeze
-      (-dynamic).should equal(dynamic)
-    end
+  it "does not deduplicate a frozen string when it has instance variables" do
+    dynamic = %w(this string is frozen).join(' ')
+    dynamic.instance_variable_set(:@a, 1)
+    dynamic.freeze
+
+    (-dynamic).should_not.equal?("this string is frozen".freeze)
+    (-dynamic).should_not.equal?((-"this string is frozen").freeze)
+    (-dynamic).should.equal?(-dynamic)
   end
 end