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      import nose.tools as nt

      from IPython.utils.dir2 import dir2

      class Base(object):

          x = 1

          z = 23

      def test_base():

          res = dir2(Base())

          assert ('x' in res)

          assert ('z' in res)

          assert ('y' not in res)

          assert ('__class__' in res)

          nt.assert_equal(res.count('x'), 1)

          nt.assert_equal(res.count('__class__'), 1)

      def test_SubClass():

          class SubClass(Base):

              y = 2

          res = dir2(SubClass())

          assert ('y' in res)

          nt.assert_equal(res.count('y'), 1)

          nt.assert_equal(res.count('x'), 1)

      def test_SubClass_with_trait_names_method():

          class SubClass(Base):

              y = 2

              def trait_names(self):

                  return ['t', 'umbrella']

          res = dir2(SubClass())

          assert('trait_names' in res)

          assert('umbrella' in res)

          nt.assert_equal(res[-6:], ['t', 'trait_names','umbrella', 'x','y','z'])

          nt.assert_equal(res.count('t'), 1)

      def test_SubClass_with_trait_names_attr():

          # usecase: trait_names is used in a class describing psychological classification

          class SubClass(Base):

              y = 2

              trait_names = 44

          res = dir2(SubClass())

          assert('trait_names' in res)

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				import nose.tools as nt
				from IPython.utils.dir2 import dir2


				class Base(object):
				x = 1
				z = 23


				def test_base():
				res = dir2(Base())
				assert ('x' in res)
				assert ('z' in res)
				assert ('y' not in res)
				assert ('__class__' in res)
				nt.assert_equal(res.count('x'), 1)
				nt.assert_equal(res.count('__class__'), 1)

				def test_SubClass():

				class SubClass(Base):
				y = 2

				res = dir2(SubClass())
				assert ('y' in res)
				nt.assert_equal(res.count('y'), 1)
				nt.assert_equal(res.count('x'), 1)


				def test_SubClass_with_trait_names_method():

				class SubClass(Base):
				y = 2
				def trait_names(self):
				return ['t', 'umbrella']

				res = dir2(SubClass())
				assert('trait_names' in res)
				assert('umbrella' in res)
				nt.assert_equal(res[-6:], ['t', 'trait_names','umbrella', 'x','y','z'])
				nt.assert_equal(res.count('t'), 1)


				def test_SubClass_with_trait_names_attr():
				# usecase: trait_names is used in a class describing psychological classification

				class SubClass(Base):
				y = 2
				trait_names = 44

				res = dir2(SubClass())
				assert('trait_names' in res)