public function testBackground()
{
$style = new OutputFormatterStyle();
$style->setBackground('black');
$this->assertEquals("[40m", $style->getBeginStyle());
$this->assertEquals("[0m", $style->getEndStyle());
$style->setBackground('yellow');
$this->assertEquals("[43m", $style->getBeginStyle());
$this->setExpectedException('InvalidArgumentException');
$style->setBackground('undefined-color');
}
