def METHOD_NAME(self):
    set_attr_on_json_field(
        self.instance, 'config.value_display.plot.width.units', 'in')
    self.plot.convert_to_display_units()
    self.plot.width = 12
    self.plot.convert_to_database_units()
    self.plot.save_with_user(self.user)
    updated_plot = Plot.objects.get(pk=self.plot.pk)
    self.assertAlmostEqual(1, updated_plot.width)