public function testClear()
{
$this->assertEquals('lorem ipsum', StringUtils::clear(' lorem <i>ipsum</i> '));
$this->assertEquals('lorem ipsum dolor sit amet', StringUtils::clear(' lorem
ipsum
dolor <i>sit</i>, (amet)'));
$this->assertEquals('lorem ipsum dolor sit amet adipiscing elit', StringUtils::clear(' lorem `ipsum~ dolor !!! @sit #$ % ^ * (am/et) - _adipiscing+ = [ { } ] | \\ : ; " \' >< elit.???'));
$this->assertEquals('lorem, ipsum/dolor sit amet', StringUtils::clear('lorem, ipsum/dolor sit amet ', false));
}