'Check if coefficients are on output after apply'

def test_output_coefficients(self):

    self.assertIsNone(self.get_output(self.widget.Outputs.coefficients))
    self.send_signal('Data', self.data)
    self.widget.apply_button.button.click()
    self.assertIsInstance(self.get_output(self.widget.Outputs.coefficients), Table)
