@Test
  public void testResetArea() throws Exception {
    areaPicker.setArea(Area.fromRaiNganSqaureWa(2, 0, 30));

    areaPicker.setArea(Area.fromSquareMeter(0));

    assertEquals("", areaPicker.getText());
  }
  @Test
  public void testShowOnlyRai() throws Exception {
    areaPicker.setArea(Area.fromRaiNganSqaureWa(2, 0, 0));

    assertEquals("2 ไร่", areaPicker.getText());
  }
  @Test
  public void testShowAreaRaiNganSquareWa() throws Exception {
    areaPicker.setArea(Area.fromRaiNganSqaureWa(3, 3, 40));

    assertEquals("3 ไร่ 3 งาน 40 ตารางวา", areaPicker.getText());
  }
 @Test
 public void testShowDefaultMessage() throws Exception {
   assertEquals("", areaPicker.getText());
 }
 @Test
 public void testHint() throws Exception {
   assertEquals(AreaPicker.HINT_MESSAGE, areaPicker.getHint());
 }