public function testCategorizeByKeyArrayItems()
{
$this->assertCount(0, ObjectUtils::categorizeByKey($this->_provideCollection(0, '_provideArray'), 'id'));
$this->assertCount(5, ObjectUtils::categorizeByKey($this->_provideCollection(5, '_provideArray'), 'id'));
$this->assertCount(5, ObjectUtils::categorizeByKey($this->_provideCollection(123, '_provideArray'), 'categoryId'));
$this->assertCount(0, ObjectUtils::categorizeByKey($this->_provideCollection(123), '_provideArray', 'undefined'));
$namedCollection = ObjectUtils::keyExplode($this->_provideCollection(123, '_provideArray'), 'name');
$byCategoryId = ObjectUtils::categorizeByKey($namedCollection, 'categoryId');
$this->assertCount(5, $byCategoryId);
$this->assertArrayHasKey(3, $byCategoryId);
$this->assertArrayNotHasKey('item.5', $byCategoryId[1]);
// it should be here (if preserved keys), but let's test all just in case
$this->assertArrayNotHasKey('item.5', $byCategoryId[2]);
$this->assertArrayNotHasKey('item.5', $byCategoryId[3]);
$this->assertArrayNotHasKey('item.5', $byCategoryId[4]);
$this->assertArrayNotHasKey('item.5', $byCategoryId[5]);
$byCategoryIdNamed = ObjectUtils::categorizeByKey($namedCollection, 'categoryId', true);
$this->assertCount(5, $byCategoryIdNamed);
$this->assertArrayHasKey(3, $byCategoryIdNamed);
$this->assertArrayHasKey('item.5', $byCategoryIdNamed[1]);
}
