.write_attribute(new DeviceAttribute(attributeName, value));
final String format = "%7.3f";
assertTrue(waitLabelText(label, formatValue(value, format), 5000));
// stop widget and check is disconected
widget.stop();
Sleeper.SECONDS.sleep(2);
assertEquals("+X.XX", label.getText());
// restart and bean show the same value as device
widget.start();