cluster-id/counter.test.js

Database cluster friendly object id with great query isolation.

/* global test, expect */
var createCounter = require('./counter')
var ref = require('./base64');
var BASE = ref.BASE;
var encode = ref.encode;

test('return unchanged single symbol counter', function () {
  var ref = createCounter(1);
  var encodeCounter = ref.encodeCounter;
  expect(encode(10, 1)).toBe('9')
  expect(encodeCounter(10)).toBe('9')
})

test('swap symbols in 2 symbols counter', function () {
  var ref = createCounter(2);
  var encodeCounter = ref.encodeCounter;
  expect(encode(BASE - 1, 2)).toBe('-z')
  expect(encodeCounter(BASE - 1)).toBe('z-')
  expect(encode(Math.pow( BASE, 2 ) - 2, 2)).toBe('zy')
  expect(encodeCounter(Math.pow( BASE, 2 ) - 2)).toBe('yz')
})

test('swap symbols in 3 symbols counter', function () {
  var ref = createCounter(3);
  var encodeCounter = ref.encodeCounter;
  expect(encode(BASE - 1, 3)).toBe('--z')
  expect(encodeCounter(BASE - 1, 3)).toBe('z--')
  expect(encode(Math.pow( BASE, 2 ) - 2, 3)).toBe('-zy')
  expect(encodeCounter(Math.pow( BASE, 2 ) - 2)).toBe('yz-')
  expect(encode(Math.pow( BASE, 2 ) + 3, 3)).toBe('0-2')
  expect(encodeCounter(Math.pow( BASE, 2 ) + 3)).toBe('2-0')
})

test('swap symbols in 4 symbols counter', function () {
  var ref = createCounter(4);
  var encodeCounter = ref.encodeCounter;
  expect(encode(BASE - 1, 4)).toBe('---z')
  expect(encodeCounter(BASE - 1)).toBe('z---')
  expect(encode(BASE + 3, 4)).toBe('--02')
  expect(encodeCounter(BASE + 3)).toBe('20--')
  expect(encode(Math.pow( BASE, 2 ) + 3, 4)).toBe('-0-2')
  expect(encodeCounter(Math.pow( BASE, 2 ) + 3)).toBe('2-0-')
  expect(encode(556789, 4)).toBe('16vp')
  expect(encodeCounter(556789)).toBe('pv61')
})