"264d73", "913399" => "6d2673" ); foreach ($expected as $original => $darker) { $color = new Color($original); Assert::same($darker, $color->darken(), 'Incorrect darker color returned.'); } $expected = array( "336699" => "4080bf", "913399" => "b540bf" ); foreach ($expected as $original => $lighter) { $color = new Color($original); Assert::same($lighter, $color->lighten(), "Incorrect lighter color returned."); }