def METHOD_NAME(self):
    """
    Test that a postprocessor data updates when file is changed.
    """
    self.copyfiles(partial=True)
    var = 'air_temp_set_1'
    self._control._groups[0]._toggles[var].CheckBox.setCheckState(QtCore.Qt.Checked)
    self._control._groups[0]._toggles[var].CheckBox.clicked.emit(True)
    self.assertImage('testUpdateData0.png')
    # Reload the data (this would be done via a Timer)
    time.sleep(1) # need to wait a bit for the modified time to change
    self.copyfiles()
    self.assertImage('testUpdateData1.png')