/**
* @dataProvider provideCases
*/
function testCases(array $insert, callable $filter, array $expect, array $expectPreserveKeys)
{
$iterator = new ArrayIterator($insert);
$filtered = $iterator->filter($filter);
$this->assertCount(count($expect), $filtered);
$this->assertEquals($expect, $filtered->values()->toArray());
$this->assertEquals($expectPreserveKeys, $filtered->toArray());
}
function testFilter()
{
$iterator = new ArrayIterator([0]);
$this->assertInstanceOf('Collections\\FilteringIterator', $iterator->filter(function () {
}));
}