1 files changed, 6 insertions, 0 deletions
diff --git a/activesupport/test/json/encoding_test.rb b/activesupport/test/json/encoding_test.rb
index 8cf1a54a99..a9590f164f 100644
--- a/activesupport/test/json/encoding_test.rb
+++ b/activesupport/test/json/encoding_test.rb
@@ -270,6 +270,12 @@ class TestJSONEncoding < Test::Unit::TestCase
                  JSON.parse(json_string_and_date))
   end
 
+  def test_nil_true_and_false_represented_as_themselves
+    assert_equal nil,   nil.as_json
+    assert_equal true,  true.as_json
+    assert_equal false, false.as_json
+  end
+
   protected
 
     def object_keys(json_object)