public function testCaseSensitivity()
{
$node = new Node(null, true);
$node->get('A', true)->add(array('upper'));
$node->get('a', true)->add(array('lower'));
$this->assertArraySubset(['upper'], $node->get('A')->getValues());
$this->assertArraySubset(['lower'], $node->get('a')->getValues());
$this->assertTrue($node->has('A'));
$this->assertTrue($node->has('a'));
$node->removeAttribute('a');
$this->assertArraySubset(['upper'], $node->get('A')->getValues());
$this->assertEmpty($node->get('a'));
// default is no case sensitivity
$node = new Node();
$node->get('A', true)->add(array('upper'));
$node->get('a', true)->add(array('lower'));
// both will be lower
$this->assertArraySubset(['upper', 'lower'], $node->get('A')->getValues());
$this->assertArraySubset(['upper', 'lower'], $node->get('a')->getValues());
$node->removeAttribute('A');
$this->assertFalse($node->has('A'));
$this->assertFalse($node->has('a'));
}