new_contents: import unittest
  import importlib
  
  ENGINES = [
      'lammps',
      'openfoam',
      'jyulb']
  
  class TestEngineImport(unittest.TestCase):
  
      def test_engine_import(self):
          for engine in ENGINES:
              importlib.import_module('simphony.engine',engine)
  
subject: add basic integration test