1 files changed, 9 insertions, 1 deletions
diff --git a/spec/ruby/core/range/dup_spec.rb b/spec/ruby/core/range/dup_spec.rb
index 6c9d0c954a..fab3c3f1b2 100644
--- a/spec/ruby/core/range/dup_spec.rb
+++ b/spec/ruby/core/range/dup_spec.rb
@@ -2,14 +2,22 @@ require_relative '../../spec_helper'
 
 describe "Range#dup" do
   it "duplicates the range" do
-    copy = (1..3).dup
+    original = (1..3)
+    copy = original.dup
     copy.begin.should == 1
     copy.end.should == 3
     copy.should_not.exclude_end?
+    copy.should_not.equal?(original)
 
     copy = ("a"..."z").dup
     copy.begin.should == "a"
     copy.end.should == "z"
     copy.should.exclude_end?
   end
+
+  it "creates an unfrozen range" do
+    (1..2).dup.should_not.frozen?
+    (1..).dup.should_not.frozen?
+    Range.new(1, 2).dup.should_not.frozen?
+  end
 end