public function testAlpha()
{
$object = new Color();
$this->assertInstanceOf('PhpOffice\\PhpPresentation\\Style\\Color', $object->setARGB());
$this->assertEquals(100, $object->getAlpha());
$this->assertInstanceOf('PhpOffice\\PhpPresentation\\Style\\Color', $object->setARGB(Color::COLOR_BLUE));
$this->assertEquals(100, $object->getAlpha());
$this->assertInstanceOf('PhpOffice\\PhpPresentation\\Style\\Color', $object->setARGB('AA0000FF'));
$this->assertEquals(66.67, $object->getAlpha());
}