function testTags()
{
$string = "<b>a</b><em>b</em>c<img />";
$this->assertEqual(FilterComponent::tags($string), 'abc');
$this->assertEqual(FilterComponent::tags($string, array('b')), '<b>a</b>bc');
$this->assertEqual(FilterComponent::tags($string, array('b', 'em', 'img')), '<b>a</b><em>b</em>c<img />');
$this->assertEqual(FilterComponent::tags($string, array('b'), true), 'a<em>b</em>c<img />');
$this->assertEqual(FilterComponent::tags($string, array('img'), true), '<b>a</b><em>b</em>c');
$this->assertEqual(FilterComponent::tags($string, array('b', 'img'), true), 'a<em>b</em>c');
}
