text: import unittest
  
  import sbol2
  
  
  class TestError(unittest.TestCase):
  
      def test_sbol_error_warning(self):
          # There are lots of places where the SBOLError constructor is
          # called with arguments in the wrong order. A warning has been
          # added to note these occurrences until they can be fixed.
          with self.assertWarns(RuntimeWarning):
              sbol2.SBOLError(sbol2.SBOLErrorCode.NOT_FOUND_ERROR,
                              'Item not found')
  
      def test_what(self):
          msg = 'Item not found'
          error = sbol2.SBOLError(msg, sbol2.SBOLErrorCode.NOT_FOUND_ERROR)
          self.assertEqual(error.what(), msg)
  
      def test_error_code(self):
          msg = 'Item not found'
          code = sbol2.SBOLErrorCode.NOT_FOUND_ERROR
          error = sbol2.SBOLError(msg, code)
          self.assertEqual(error.error_code(), code)
  