public function testCategorizeByKey()
{
$this->assertCount(0, ArrayUtils::categorizeByKey($this->_getArrayPreset('empty_array'), 'id'));
$this->assertCount(5, ArrayUtils::categorizeByKey($this->_getArrayPreset('2D_collection_5'), 'id'));
$this->assertCount(3, ArrayUtils::categorizeByKey($this->_getArrayPreset('2D_collection_5'), 'categoryId'));
$byCategoryId = ArrayUtils::categorizeByKey($this->_getArrayPreset('2D_collection_5_named'), 'categoryId');
$this->assertCount(3, $byCategoryId);
$this->assertArrayHasKey(3, $byCategoryId);
$this->assertArrayNotHasKey('sit', $byCategoryId[3]);
$byCategoryIdNamed = ArrayUtils::categorizeByKey($this->_getArrayPreset('2D_collection_5_named'), 'categoryId', true);
$this->assertCount(3, $byCategoryIdNamed);
$this->assertArrayHasKey(3, $byCategoryIdNamed);
$this->assertArrayHasKey('sit', $byCategoryIdNamed[3]);
$this->assertCount(0, ArrayUtils::categorizeByKey($this->_getArrayPreset('2D_collection_5'), 'undefined'));
}
