public function testWeekendDateFilter(\Pinq\ITraversable $traversable, array $data)
{
$traversable = $traversable->where(function (\DateTime $dateTime) {
return in_array($dateTime->format('D'), ['Sat', 'Sun']);
});
foreach ($traversable as $dateTime) {
$this->assertTrue(in_array($dateTime->format('D'), ['Sat', 'Sun']), 'Must be saturday or sunday');
}
}