Calculator::add PHP Méthode

    public function add($a, $b)
    {
        return $a + $b;
    }

 public function testAdd()
 {
     $calc = new Calculator();
     $sum = $calc->add(array(2, 3, 4, 5));
     $this->assertEquals(14, $sum);
     //check if 2+3+4+5 is equal to 14
 }