public function testSortById()
{
$curtainDesign = new CurtainDesign();
$curtainColour1 = new CurtainColour();
$curtainColour1->setId(30);
$curtainColour1->setName("two");
$curtainDesign->addCurtainColour($curtainColour1);
$curtainColour3 = new CurtainColour();
$curtainColour3->setId(40);
$curtainColour3->setName("three");
$curtainDesign->addCurtainColour($curtainColour3);
$curtainColour2 = new CurtainColour();
$curtainColour2->setId(1);
$curtainColour2->setName("one");
$curtainDesign->addCurtainColour($curtainColour2);
$sortedColours = $curtainDesign->getSortedCurtainColoursById();
reset($sortedColours);
$this->assertEquals("one", current($sortedColours)->getName());
$this->assertEquals("two", next($sortedColours)->getName());
$this->assertEquals("three", next($sortedColours)->getName());
}
