1 files changed, 22 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/object/duplicable_test.rb b/activesupport/test/core_ext/object/duplicable_test.rb
new file mode 100644
index 0000000000..d37f4bd0d8
--- /dev/null
+++ b/activesupport/test/core_ext/object/duplicable_test.rb
@@ -0,0 +1,22 @@
+require 'abstract_unit'
+require 'bigdecimal'
+require 'active_support/core_ext/object/duplicable'
+require 'active_support/core_ext/numeric/time'
+
+class DuplicableTest < ActiveSupport::TestCase
+  RAISE_DUP  = [nil, false, true, :symbol, 1, 2.3, method(:puts)]
+  ALLOW_DUP = ['1', Object.new, /foo/, [], {}, Time.now, Class.new, Module.new]
+  ALLOW_DUP << BigDecimal.new('4.56')
+
+  def test_duplicable
+    RAISE_DUP.each do |v|
+      assert !v.duplicable?
+      assert_raises(TypeError, v.class.name) { v.dup }
+    end
+
+    ALLOW_DUP.each do |v|
+      assert v.duplicable?, "#{ v.class } should be duplicable"
+      assert_nothing_raised { v.dup }
+    end
+  end
+end