@Test
 public void testFindByNativeTypeAndNameAndVersion() throws PluginNotFoundException {
   assertNotNull(provider.findByNativeTypeAndNameAndVersion("YAWL 2.2", "test", "1.0"));
   try {
     provider.findByNativeTypeAndNameAndVersion("YAWL 2.2", "invalid", "1.0");
     fail();
   } catch (PluginNotFoundException e) {
   }
 }