1 files changed, 22 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/duplicable_test.rb b/activesupport/test/core_ext/duplicable_test.rb
new file mode 100644
index 0000000000..7f8c0f7d3b
--- /dev/null
+++ b/activesupport/test/core_ext/duplicable_test.rb
@@ -0,0 +1,22 @@
+require File.dirname(__FILE__) + '/../abstract_unit'
+
+class DuplicableTest < Test::Unit::TestCase
+  NO  = [nil, false, true, :symbol, 1, 2.3, BigDecimal.new('4.56')]
+  YES = ['1', Object.new, /foo/, [], {}]
+
+  def test_duplicable
+    NO.each do |v|
+      assert !v.duplicable?
+      begin
+        v.dup
+        fail
+      rescue Exception
+      end
+    end
+
+    YES.each do |v|
+      assert v.duplicable?
+      assert_nothing_raised { v.dup }
+    end
+  end
+end