useErrors = libxml_use_internal_errors(true); } protected function tearDown(): void { libxml_use_internal_errors($this->useErrors); } public function testLoadInvalidString(): void { $html = ''; (new Html())->loadFromString($html); self::assertNotEmpty(libxml_get_errors()); } public function testLoadValidString(): void { $html = ''; (new Html())->loadFromString($html); self::assertEmpty(libxml_get_errors()); } }