@Test public void TestGetCellAt() { System.out.println("getCellAt"); Image image = Toolkit.getDefaultToolkit().createImage(getClass().getResource("resources/x-icon.gif")); ImageIcon icon = new ImageIcon(image); icon.setDescription("X"); instance.setValueAt(icon, 0, 0); String expResult = "X"; String result = instance.getCellAt(0, 0); assertEquals(expResult, result); }