@Test public void testErase() { engine.erase(); Assert.assertTrue("Erase() - Buffer isn't empty", buffer.getText().equals("")); Assert.assertTrue( "Erase() - Selection isn't (0, 0)", selection.getStart() == 0 && selection.getLength() == 0); buffer.setText("test"); engine.erase(); Assert.assertTrue( "Erase() - Buffer content isn't the set text", buffer.getText().equals("test")); Assert.assertTrue( "Erase() - Selection isn't (0, 0)", selection.getStart() == 0 && selection.getLength() == 0); selection.setStart(4); engine.erase(); Assert.assertTrue( "Erase() - Buffer content isn't the set text", buffer.getText().equals("tes")); Assert.assertTrue( "Erase() - Selection isn't (3, 0)", selection.getStart() == 3 && selection.getLength() == 0); selection.setStart(0); selection.setLength(3); engine.erase(); Assert.assertTrue("Erase() - Buffer content isn't the set text", buffer.getText().equals("")); Assert.assertTrue( "Erase() - Selection isn't (0, 0)", selection.getStart() == 0 && selection.getLength() == 0); }