Added Hash#deep_dup function which performs deep duplication on given hash

1 files changed, 15 insertions, 0 deletions

diff --git a/activesupport/test/core_ext/hash_ext_test.rb b/activesupport/test/core_ext/hash_ext_test.rb
index 545fed2684..bfcfddad47 100644
--- a/activesupport/test/core_ext/hash_ext_test.rb
+++ b/activesupport/test/core_ext/hash_ext_test.rb
@@ -316,6 +316,21 @@ class HashExtTest < Test::Unit::TestCase
     assert_equal expected, hash_1
   end
 
+  def test_deep_dup
+    hash = { :a => { :b => 'b' } }
+    dup = hash.deep_dup
+    dup[:a][:c] = 'c'
+    assert_equal nil, hash[:a][:c]
+    assert_equal 'c', dup[:a][:c]
+  end
+
+  def test_deep_dup_initialize
+    zero_hash = Hash.new 0
+    hash = { :a => zero_hash }
+    dup = hash.deep_dup
+    assert_equal 0, dup[:a][44]
+  end
+
   def test_store_on_indifferent_access
     hash = HashWithIndifferentAccess.new
     hash.store(:test1, 1)