Webmozart\Expression\Expr::andX PHP Method

    public static function andX(array $conjuncts)
    {
        return new AndX($conjuncts);
    }

 public function testDomainExpressions()
 {
     $c1 = new Customer();
     $c1->setPremium(true);
     $c2 = new Customer();
     $c2->setBookings(array('booking1', 'booking2'));
     $c3 = new Customer();
     $c3->setPremium(true);
     $c3->setBookings(array('booking1'));
     $customers = array($c1, $c2, $c3);
     $this->assertEquals(array($c1, 2 => $c3), Expr::filter($customers, new IsPremium()));
     $this->assertEquals(array(1 => $c2, 2 => $c3), Expr::filter($customers, new HasPreviousBookings()));
     $this->assertEquals(array(2 => $c3), Expr::filter($customers, Expr::andX(array(new HasPreviousBookings(), new IsPremium()))));
 }