/**
* Tests countBy
*
* @return void
*/
public function testCountBy()
{
$items = [['id' => 1, 'name' => 'foo', 'parent_id' => 10], ['id' => 2, 'name' => 'bar', 'parent_id' => 11], ['id' => 3, 'name' => 'baz', 'parent_id' => 10]];
$collection = new Collection($items);
$grouped = $collection->countBy('parent_id');
$expected = [10 => 2, 11 => 1];
$this->assertEquals($expected, iterator_to_array($grouped));
$this->assertInstanceOf('\\Cake\\Collection\\Collection', $grouped);
$grouped = $collection->countBy(function ($element) {
return $element['parent_id'];
});
$this->assertEquals($expected, iterator_to_array($grouped));
}