def METHOD_NAME(self):
    self.widget.output_metas = False
    data = Orange.data.Table("iris.tab")
    self.send_signal(self.widget.Inputs.data, data)
    self.widget.add_preprocessor(self.widget.PREPROCESSORS[0])
    self.widget.commit.now()
    out_data = self.get_output(self.widget.Outputs.preprocessed_data)
    self.assertEqual(1, len(out_data.domain.attributes))
    self.assertEqual(0, len(out_data.domain.metas))
    preprocessor = self.get_output(self.widget.Outputs.preprocessor)
    out_data = preprocessor(data)
    preprocessed = preprocessor(data)
    self.assertEqual(1, len(preprocessed.domain.attributes))
    self.assertEqual(0, len(out_data.domain.metas))