public function testNormalizersClearing() { $collection = new Collection(['X' => 'a', 'y' => 'b', 'Z' => 'C']); $collection->addNormalizer(function (&$value) { $value = strtolower($value); }); $this->assertCount(1, $collection->getNormalizers()); $collection->clearNormalizers(); $this->assertEmpty($collection->getNormalizers()); }