add a test for [ruby-dev:34581].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@16278 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_array.rb

@@ -1513,4 +1513,11 @@ class TestArray < Test::Unit::TestCase
       a.product(a, a, a, a, a, a, a, a, a, a) {}
     end
   end
+
+  class Array2 < Array
+  end
+
+  def test_array_subclass
+    assert_equal(Array2, Array2[1,2,3].uniq.class, "[ruby-dev:34581]")
+  end
 end