/** Some checks for the remove method. */
  @Test
  public void testRemove() {
    DefaultStatisticalCategoryDataset data = new DefaultStatisticalCategoryDataset();

    try {
      data.remove("R1", "R2");
      fail("UnknownKeyException should have been thrown on the unknown key");
    } catch (UnknownKeyException e) {
      assertEquals("Row key (R1) not recognised.", e.getMessage());
    }

    data.add(1.0, 0.5, "R1", "C1");
    assertEquals(new Range(1.0, 1.0), data.getRangeBounds(false));
    assertEquals(new Range(0.5, 1.5), data.getRangeBounds(true));

    data.add(1.4, 0.2, "R2", "C1");

    assertEquals(1.0, data.getRangeLowerBound(false), EPSILON);
    assertEquals(1.4, data.getRangeUpperBound(false), EPSILON);
    assertEquals(0.5, data.getRangeLowerBound(true), EPSILON);
    assertEquals(1.6, data.getRangeUpperBound(true), EPSILON);

    data.remove("R1", "C1");

    assertEquals(1.4, data.getRangeLowerBound(false), EPSILON);
    assertEquals(1.4, data.getRangeUpperBound(false), EPSILON);
    assertEquals(1.2, data.getRangeLowerBound(true), EPSILON);
    assertEquals(1.6, data.getRangeUpperBound(true), EPSILON);
  }