public function testRemove() {
$this->_coll[] = 'one';
$this->_coll[] = 'two';
$el = $this->_coll
->remove(0);
$this
->assertEquals('one', $el);
$this
->assertEquals($this->_coll
->contains('one'), false);
$this
->assertNull($this->_coll
->remove(0));
}