1 files changed, 16 insertions, 0 deletions
diff --git a/test/ruby/test_array.rb b/test/ruby/test_array.rb
index 8a8af491c9..49628215b5 100644
--- a/test/ruby/test_array.rb
+++ b/test/ruby/test_array.rb
@@ -1378,6 +1378,22 @@ class TestArray < Test::Unit::TestCase
     end
   end
 
+  def test_sort_bang_with_freeze
+    ary = []
+    o1 = Object.new
+    o1.singleton_class.class_eval {
+      define_method(:<=>) {|v|
+        ary.freeze
+        1
+      }
+    }
+    o2 = o1.dup
+    ary << o1 << o2
+    orig = ary.dup
+    assert_raise(RuntimeError, "frozen during comparison") {ary.sort!}
+    assert_equal(orig, ary, "must not be modified once frozen")
+  end
+
   def test_to_a
     a = @cls[ 1, 2, 3 ]
     a_id = a.__id__