/**
*/
public function testControlCharacters()
{
$this->assertEquals('', Text::controlCharacterPHP2OOXML());
$this->assertEquals('aeiou', Text::controlCharacterPHP2OOXML('aeiou'));
$this->assertEquals('àéîöù', Text::controlCharacterPHP2OOXML('àéîöù'));
$value = rand(0, 8);
$this->assertEquals('_x' . sprintf('%04s', strtoupper(dechex($value))) . '_', Text::controlCharacterPHP2OOXML(chr($value)));
$this->assertEquals('', Text::controlCharacterOOXML2PHP(''));
$this->assertEquals(chr(0x8), Text::controlCharacterOOXML2PHP('_x0008_'));
}