function testToArray()
{
$stack = new LinkedStack();
for ($i = 0; $i < 3; $i++) {
$stack->push($i);
}
$array = $stack->toArray();
$this->assertTrue(is_array($array));
$this->assertCount(3, $array);
$i = 2;
foreach ($array as $item) {
$this->assertEquals($i--, $item);
}
}