function testIteratorForeach()
{
$stack = new LinkedStack();
$stack->push(1);
$stack->push(2);
$stack->push(3);
$stack->push(4);
$iterator = $stack->getIterator();
$this->assertInstanceOf('Collections\\LinkedStackIterator', $iterator);
$this->assertCount(4, $iterator);
$expectedKey = 0;
$expectedValue = 4;
$iterator->rewind();
for ($i = 0; $i < 4; $i++) {
$this->assertTrue($iterator->valid());
$this->assertEquals($expectedKey++, $iterator->key());
$this->assertEquals($expectedValue--, $iterator->current());
$iterator->next();
}
$this->assertFalse($iterator->valid());
}