1 files changed, 12 insertions, 0 deletions
diff --git a/spec/ruby/library/rbconfig/rbconfig_spec.rb b/spec/ruby/library/rbconfig/rbconfig_spec.rb
index 7c3fbf6c58..35b465d106 100644
--- a/spec/ruby/library/rbconfig/rbconfig_spec.rb
+++ b/spec/ruby/library/rbconfig/rbconfig_spec.rb
@@ -23,6 +23,18 @@ describe 'RbConfig::CONFIG' do
       File.should.exist?("#{archdir}/etc.#{RbConfig::CONFIG['DLEXT']}")
     end
   end
+
+  it "contains no frozen strings even with --enable-frozen-string-literal" do
+    ruby_exe(<<-RUBY, options: '--enable-frozen-string-literal').should == "Done\n"
+      require 'rbconfig'
+      RbConfig::CONFIG.each do |k, v|
+        if v.frozen?
+          puts "\#{k} Failure"
+        end
+      end
+      puts 'Done'
+    RUBY
+  end
 end
 
 describe "RbConfig::TOPDIR" do