'use strict';

let expect = require('chai').expect;
let assert = require('chai').assert;
let should = require('chai').should();

let sinon = require('sinon');


describe('paging', () => {
    context('correct logic', () => {
        it('should try to save cache only once', () => {
            let cache = require('../lib/cache');
            let paging = require('../lib/paging');
            let cacheMock = sinon.mock(cache);
            cacheMock.expects('put').withArgs('paging').once();

            let result = paging(100, 10, 3, cache);

            cacheMock.verify();
        });

        it('should return correct values on page 1', () => {

            let cache = {
                put: sinon.fake.returns(true),
                has: sinon.fake.returns(false)
            }

            let paging = require('../lib/paging');
            let result = paging(100, 10, 3, cache);

            expect(result).to.be.an('array');

            let labels = result.map((item) => {
                return item.label;
            });

            expect(labels).to.have.ordered.members([1,2,3,4,9,10]);
        });

        it('should call logger', () => {
            let cache = require('../lib/cache');
            let paging = require('../lib/paging');

            sinon.stub(cache,'put').returns(true);
            sinon.stub(cache,'has').withArgs('paging').returns(false);

            let result = paging(100, 10, 3, cache);

            expect(cache.put.called).to.be.equal(true);

            sinon.restore();
        });
    });
})