public function testId()
{
// Create two requests
$request_one = new Request();
$request_two = new Request();
// Make sure the ID's aren't null
$this->assertNotNull($request_one->id());
$this->assertNotNull($request_two->id());
// Make sure that multiple calls yield the same result
$this->assertSame($request_one->id(), $request_one->id());
$this->assertSame($request_one->id(), $request_one->id());
$this->assertSame($request_two->id(), $request_two->id());
$this->assertSame($request_two->id(), $request_two->id());
// Make sure the ID's are unique to each request
$this->assertNotSame($request_one->id(), $request_two->id());
}