def METHOD_NAME(self):
    dec = decimal.Decimal('10.345')
    self.assertEqual(dec, D(dec))
    self.assertEqual(dec, D('10.345'))
    self.assertEqual(decimal.Decimal('10034.45'), D('10,034.45'))
    self.assertEqual(decimal.Decimal('-83434309.10'), D('-83,434,309.10'))
    self.assertEqual(decimal.Decimal('-122.34'), D('- 122.34'))
    self.assertEqual(decimal.Decimal(), D(''))
    self.assertEqual(decimal.Decimal(), D(None))