@Test
  public void imagePresentTest() {

    // check that all images are not null when there should be an image present
    assertNotNull(myLabelProvider.getColumnImage(myTaskReview1, 0));
    assertNotNull(myLabelProvider.getColumnImage(myTaskReview1, 1));
    assertNotNull(myLabelProvider.getColumnImage(myTaskReview1, 2));
    assertNotNull(myLabelProvider.getColumnImage(myTaskReview1, 3));
  }
  @Test
  public void imageNotPresentTests() {

    // check that all images are null when they should be
    assertNotNull(myLabelProvider.getColumnImage(myTaskReview1, 0));
    assertNotNull(myLabelProvider.getColumnImage(myTaskReview1, 1));
    assertNotNull(myLabelProvider.getColumnImage(myTaskReview1, 2));
    assertNotNull(myLabelProvider.getColumnImage(myTaskReview1, 3));

    assertEquals(
        CommonImages.getImage(CommonImages.OVERLAY_CLEAR),
        myLabelProvider.getColumnImage(myTaskReview1, 0));
    assertEquals(
        CommonImages.getImage(CommonImages.OVERLAY_CLEAR),
        myLabelProvider.getColumnImage(myTaskReview1, 0));
    assertEquals(
        CommonImages.getImage(CommonImages.OVERLAY_CLEAR),
        myLabelProvider.getColumnImage(myTaskReview1, 0));
    assertEquals(
        CommonImages.getImage(CommonImages.OVERLAY_CLEAR),
        myLabelProvider.getColumnImage(myTaskReview1, 0));
  }