### Question:
IntegerToDoubleConverter implements Converter<Integer, Double> { @Override public Double toWidgetValue(Integer modelValue) { return modelValue != null ? modelValue.doubleValue() : null; }  @Override Class<Integer> getModelType(); @Override Class<Double> getComponentType(); @Override Integer toModelValue(Double widgetValue); @Override Double toWidgetValue(Integer modelValue);  }### Answer:
@Test public void testToWidgetValue() { Double widgetValue = converter.toWidgetValue(INTEGER_VALUE); assertEquals(DOUBLE_VALUE, widgetValue); }