public function testCartesianProductIterable()
{
$product = new ProductIterator(str_split('ABCD'), str_split('xy'));
$dumped = to_array($product);
$this->assertSame([['A', 'x'], ['A', 'y'], ['B', 'x'], ['B', 'y'], ['C', 'x'], ['C', 'y'], ['D', 'x'], ['D', 'y']], $dumped);
$cartesian = new ProductIterator(\range(0, 2));
$cartesian->setRepeat(3);
$dumped = to_array($cartesian);
}
/**
*
*/
public function testCombinations()
{
$combinations = combinations(range(4), 3);
$results = to_array($combinations);
$this->assertSame(4, count($results));
$expected = '012 013 023 123';
$results = array_map(function ($d) {
return join('', $d);
}, $results);
$this->assertSame(preg_split("/[\\s,]+/", $expected), $results);
}