public function testRecognizesStaleResult()
{
$result = 'zabaleta4';
$tstamp = 4;
$value = new Value($result, 3);
$this->assertTrue($value->isStale($tstamp));
$value = new Value($result, 4);
$this->assertFalse($value->isStale($tstamp));
$value = new Value($result, 5);
$this->assertFalse($value->isStale($tstamp));
}