@Test
 public void testAddColorAddsColorToAvailablePool() throws Exception {
   GraphColor expected = graphColors[2];
   assertEquals(expected, fixture.getColor());
   fixture.addColor(expected.getPrimary());
   assertEquals(expected, fixture.getColor());
 }
 @Test
 public void testAddColorDoesNotAddNonExistingColor() throws Exception {
   GraphColor expected = graphColors[1];
   GraphColor graphColor = graphColors[2];
   assertEquals(graphColor, fixture.getColor());
   fixture.addColor(graphColor.getBackground());
   assertEquals(expected, fixture.getColor());
 }