public function testReferrer()
{
$request = new Request();
$this->assertNull($request->referrer());
$request = new Request();
$this->assertEquals('MY_REF', $request->userAgent('MY_REF'));
$request = new Request();
$server = ['HTTP_REFERER' => 'http://www.cubex.io'];
$request->initialize([], [], [], [], [], $server);
$this->assertEquals('http://www.cubex.io', $request->referrer());
}
