public function testPagination()
 {
     $pagination = new Pagination();
     $pagination->setCurrent(10);
     $pagination->setTotal(95);
     $pagination->setRPP(10);
     $this->assertEquals(10, $pagination->getNumberOfPages());
     $this->assertEquals(5, $pagination->countCurrentItems());
     $this->assertEquals(91, $pagination->firstItem());
     $this->assertEquals(95, $pagination->lastItem());
     //change to another page
     $pagination->setCurrent(5);
     $this->assertEquals(10, $pagination->countCurrentItems());
     $this->assertEquals(41, $pagination->firstItem());
     $this->assertEquals(50, $pagination->lastItem());
 }