1 files changed, 9 insertions, 1 deletions
diff --git a/spec/ruby/core/false/to_s_spec.rb b/spec/ruby/core/false/to_s_spec.rb
index bb2bdb65af..9e24be26a2 100644
--- a/spec/ruby/core/false/to_s_spec.rb
+++ b/spec/ruby/core/false/to_s_spec.rb
@@ -1,7 +1,15 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "FalseClass#to_s" do
   it "returns the string 'false'" do
     false.to_s.should == "false"
   end
+
+  it "returns a frozen string" do
+    false.to_s.should.frozen?
+  end
+
+  it "always returns the same string" do
+    false.to_s.should.equal?(false.to_s)
+  end
 end