1 files changed, 10 insertions, 0 deletions
diff --git a/spec/ruby/core/false/to_s_spec.rb b/spec/ruby/core/false/to_s_spec.rb
index 40853da88b..c996d87000 100644
--- a/spec/ruby/core/false/to_s_spec.rb
+++ b/spec/ruby/core/false/to_s_spec.rb
@@ -4,4 +4,14 @@ describe "FalseClass#to_s" do
   it "returns the string 'false'" do
     false.to_s.should == "false"
   end
+
+  ruby_version_is "2.7" do
+    it "returns a frozen string" do
+      false.to_s.frozen?.should == true
+    end
+
+    it "always returns the same string" do
+      false.to_s.should equal(false.to_s)
+    end
+  end
 end