[英]How do I create a Mock of a JFrame/JPanel that supports repaint functionality
我的Swing應用程序的單元測試有點問題。 我想要做的是將一個可繪制的對象傳遞給我的JPanel,每次我這樣做都應該重新繪制自己。
對於基本場景來說,現在我的單元測試:
public class GraphicViewImplTest {
private JFrame frame;
private GraphicViewImpl view; //This is my JPanel
private GraphicLineSpy firstGraphicLine;
private Line firstLine;
@Before
public void setUp() throws Exception {
frame = new JFrame();
view = new GraphicViewImpl();
frame.add(view);
frame.setVisible(true);
firstLine = new Line();
firstLine.setStart(new Point(11, 12));
firstLine.setEnd(new Point(21, 22));
firstGraphicLine = new GraphicLineSpy(firstLine);
}
@Test
public void whenReceivingLine_shouldPaintLine() {
view.receiveShape(firstGraphicLine);
assertTrue(firstGraphicLine.wasPainted());
}
}
正如您所看到的,我正在將GraphicLineSpy傳遞給我。 GraphicLine類基本上是Line類的裝飾器,它知道如何在Swing中繪制一條線。 GraphicLineSpy會覆蓋GraphicLine的paint方法,只需將標志設置為true,這樣我就可以檢查是否調用了paint方法。
現在開始實現我的GraphicView JPanel:
public class GraphicViewImpl extends JPanel implements GraphicView, Observer {
protected GraphicViewPresenter presenter;
protected List<GraphicShape> graphicShapeList = new LinkedList<>();
@Override
public void receiveShape(GraphicShape graphicShape) {
graphicShapeList.add(graphicShape);
graphicShape.addObserver(this);
repaint();
}
@Override
public void removeShape(GraphicShape graphicShape) {
graphicShapeList.remove(graphicShape);
graphicShape.removeObserver(this);
repaint();
}
public void setPresenter(GraphicViewPresenter presenter) {
this.presenter = presenter;
}
@Override
public void update() {
repaint();
}
@Override
public void paintComponent(Graphics graphics) {
super.paintComponent(graphics);
for (GraphicShape graphicShape : graphicShapeList)
graphicShape.paint(graphics);
}
}
現在,我的問題是,當我運行這些測試時,他們說我的GraphicLine沒有畫。 但是,當我實際運行程序並添加一個新的GraphicLine時,它的工作完全正常,我的所有Shapes都會被繪制。 我在測試設置中遺漏了什么嗎?
而且,這可能是最重要的部分,我想這並不是每次運行我的測試時啟動整個JFrame的最佳解決方案,所以我想知道如何最好地創建一個不會破壞的測試雙整個重繪功能。
提前感謝任何提示!
我想你應該專注於測試,而不是執行的JPanel 你的代碼,因此,你應該模擬出使用框架的Mockito(或任何其它)這些依賴關系:
public class GraphicViewImplTest {
@Rule
public MockitoRule rule = MockitoJUnit.rule();
@Mock
private Graphics2D graphics; // not tested dependency
@Mock
private GraphicShape firstLine; // not tested dependency
private GraphicViewImpl view; //This is my JPanel
@Before
public void setUp() throws Exception {
view = spy(new GraphicViewImpl());
doNothing().when(view).repaint();
}
@Test
public void whenReceivingLine_shouldPaintLine() {
view.receiveShape(firstGraphicLine);
verify(view).repaint();
verify(firstLine,never()).paint(graphics);
view.paintComponent(graphics);
verify(firstLine).paint(graphics);
}
}
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