header = new class() extends HeaderAbstract { public function generate(int $statusCode) : void { } public function getProtocolVersion() : string { return '1'; } public function set(string $key, string $value, bool $overwrite = false) : bool { return true; } public function get(string $key) : array { return []; } public function has(string $key) : bool { return true; } }; } public function testSetGet() : void { $this->header->setStatusCode(2); self::assertEquals(2, $this->header->getStatusCode()); } }