old_contents: import unittest
  
  
  class TestPluginLoading(unittest.TestCase):
  
      def test_import(self):
          try:
              from simphony.visualization import mayavi_tools
          except ImportError:
              self.fail('Could not import the mayavi visualization')
  
          self.assertTrue(hasattr(mayavi_tools, 'show'))
  
new_contents: import unittest
  
  
  class TestPluginLoading(unittest.TestCase):
  
      def test_import(self):
          try:
              from simphony.visualisation import mayavi_tools
          except ImportError:
              self.fail('Could not import the mayavi visualisation')
  
          self.assertTrue(hasattr(mayavi_tools, 'show'))
  
subject: fix spelling