/*
 * © 2017 Stratio Big Data Inc., Sucursal en España.
 *
 * This software is licensed under the Apache License, Version 2.0.
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the terms of the License for more details.
 *
 * SPDX-License-Identifier: Apache-2.0.
 */
import { StPaginationService } from './st-pagination.service';

function generateItems(n: Number): any[] {
   let items: any[] = [];

   for (let i = 1; i <= n; i++) {
      items.push({
         label: 'Example' + i,
         value: i
      });
   }

   return items;
}

describe('StPaginationService', () => {

   let service: StPaginationService;

   beforeEach(() => {
      service = new StPaginationService();
   });

   it('should split list of items', () => {
      let items = generateItems(200);
      items = service.newPage(items, 1, 20);
      expect(items.length).toBe(20);
   });

   it('should change the page and first item value should be 20', () => {
      let items = generateItems(200);
      items = service.newPage(items, 2, 20);
      expect(items[0].value).toBe(21);
   });

   it('should show the last items of the list', () => {
      let items = generateItems(200);
      items = service.newPage(items, 50, 20);
      expect(items[items.length - 1].value).toBe(200);
   });

   it('should show all list of items when perPage is equal or mayor that items length', () => {
      let items = generateItems(200);
      items = service.newPage(items, 50, 300);
      expect(items.length).toBe(200);
   });
});