json-server/test/server/utils.js

var assert = require('assert')
var utils = require('../../src/server/utils')

/* global describe, it */

describe('utils', function () {
  describe('toNative', function () {
    it('should convert string to native type', function () {
      // should convert
      assert.strictEqual(utils.toNative('1'), 1)
      assert.strictEqual(utils.toNative('0'), 0)
      assert.strictEqual(utils.toNative('true'), true)
      // should not convert
      assert.strictEqual(utils.toNative(''), '')
      assert.strictEqual(utils.toNative('\t\n'), '\t\n')
      assert.strictEqual(utils.toNative('1 '), '1 ')
      assert.strictEqual(utils.toNative('01'), '01')
      assert.strictEqual(utils.toNative(' 1'), ' 1')
      assert.strictEqual(utils.toNative('string'), 'string')
      assert.strictEqual(utils.toNative(1), 1)
      assert.strictEqual(utils.toNative(true), true)
    })
  })

  describe('getPage', function () {
    var array = [1, 2, 3, 4, 5]
    var perPage = 2

    it('should return first page', function () {
      assert.deepEqual(
        utils.getPage(array, 1, perPage),
        {
          items: [1, 2],
          current: 1,
          first: 1,
          next: 2,
          last: 3
        }
      )
    })

    it('should return second page', function () {
      assert.deepEqual(
        utils.getPage(array, 2, perPage),
        {
          items: [3, 4],
          current: 2,
          first: 1,
          prev: 1,
          next: 3,
          last: 3
        }
      )
    })

    it('should return third page (last)', function () {
      assert.deepEqual(
        utils.getPage(array, 3, perPage),
        {
          items: [5],
          current: 3,
          first: 1,
          prev: 2,
          last: 3
        }
      )
    })

    it('should return an empty array if page is greater than the last page', function () {
      assert.deepEqual(
        utils.getPage(array, 99, perPage),
        {
          items: []
        }
      )
    })

    it('should return the array if perPage is greater than the array size', function () {
      assert.deepEqual(
        utils.getPage(array, 1, 99),
        {
          items: array
        }
      )
    })

    it('should return an empty array if the array is empty', function () {
      assert.deepEqual(
        utils.getPage([], 1, 1),
        {
          items: []
        }
      )
    })
  })
})