public function testArrayAccess() {
$this->_coll[] = 'one';
$this->_coll[] = 'two';
$this
->assertEquals($this->_coll[0], 'one');
$this
->assertEquals($this->_coll[1], 'two');
unset($this->_coll[0]);
$this
->assertEquals($this->_coll
->count(), 1);
}