targetModel = getProject().getFile(getModelMigrated());
targetDiagram = getProject().getFile(getDiagram());
// migrate the model
assertFalse("the target model should not exist yet", targetModel.exists());
MigrationController a = new MigrationController();
IStatus status = a.migrateModel(sourceModel, targetModel, new NullProgressMonitor());
assertStatusOK(status);
assertTrue("the target model should have been created", targetModel.exists());
// return list of migrators used
return a.getMigratorsUsed();
}