/**
   * Test persistence of display model's properties
   *
   * @throws Exception on error
   */
  @Test
  public void testDisplayModelPersistence() throws Exception {
    final DisplayModel model = new DisplayModel();
    model.getProperty("width").setValueFromObject(400);
    model.getProperty("height").setValueFromObject(800);

    final Widget widget = new Widget("base");
    widget.setPropertyValue(widgetName, "Test");
    widget.getProperty("x").setValueFromObject(42);
    model.addChild(widget);

    final ByteArrayOutputStream out = new ByteArrayOutputStream();
    try (final ModelWriter writer = new ModelWriter(out); ) {
      writer.writeModel(model);
    }
    final String xml = out.toString();
    System.out.println(xml);

    final ModelReader reader = new ModelReader(new ByteArrayInputStream(xml.getBytes()));
    final DisplayModel readback = reader.readModel();

    assertThat(readback.getPropertyValue(CommonWidgetProperties.positionWidth), equalTo(400));
    assertThat(readback.getPropertyValue(CommonWidgetProperties.positionHeight), equalTo(800));
    assertThat(readback.getChildren().size(), equalTo(1));
    assertThat(
        readback.getChildren().get(0).getPropertyValue(CommonWidgetProperties.positionX),
        equalTo(42));
  }
  /**
   * Writing widgets as XML
   *
   * @throws Exception on error
   */
  @Test
  public void testWidgetWriting() throws Exception {
    final ByteArrayOutputStream stream = new ByteArrayOutputStream();
    try (final ModelWriter writer = new ModelWriter(stream); ) {
      final Widget widget = new CustomWidget();
      widget.setPropertyValue(widgetName, "Demo");
      widget.getProperty(CustomWidget.miscZeroTen).setValue(7);
      writer.writeWidget(widget);

      final GroupWidget group = new GroupWidget();
      group.setPropertyValue(widgetName, "My Group");

      final Widget child = new Widget("base");
      child.setPropertyValue(widgetName, "Jänner");
      group.addChild(child);

      writer.writeWidget(group);
    }

    final String xml = stream.toString();
    System.out.println(xml);

    final String desired = getExampleFile();
    assertThat(xml.replace("\r", ""), equalTo(desired));
  }
  /**
   * Write and read multi-line string property
   *
   * @throws Exception on error
   */
  @Test
  public void testMultilineString() throws Exception {
    final WidgetPropertyDescriptor<String> prop = widgetName;
    final String written_value = "Line 1\n" + "Line 2\n" + "Line 3";

    final ByteArrayOutputStream out = new ByteArrayOutputStream();
    try (final ModelWriter writer = new ModelWriter(out); ) {
      final Widget widget = new Widget("base");
      widget.setPropertyValue(prop, "StringTest");
      assertThat(widget.getProperty(prop), instanceOf(StringWidgetProperty.class));
      widget.getProperty(prop).setValue(written_value);
      writer.writeWidget(widget);
    }
    checkReadback(out.toString(), prop, written_value);

    // Same text
    String xml =
        "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
            + "<display version=\"1.0.0\">\n"
            + "  <widget type=\"base\" version=\"1.0.0\">\n"
            + "    <name>Line 1\n"
            + "Line 2\n"
            + "Line 3</name>\n"
            + "    <x>0</x>\n"
            + "    <y>0</y>\n"
            + "  </widget>\n"
            + "</display>";
    checkReadback(xml, prop, written_value);

    // .. with Unicode for the newlines
    xml =
        "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
            + "<display version=\"1.0.0\">\n"
            + "  <widget type=\"base\" version=\"1.0.0\">\n"
            + "    <name>Line 1&#x000A;"
            + "Line 2&#x0A;"
            + "Line 3</name>\n"
            + "    <x>0</x>\n"
            + "    <y>0</y>\n"
            + "  </widget>\n"
            + "</display>";
    checkReadback(xml, prop, written_value);
  }