grafana/scripts/node_modules/random-weighted-choice/test/test.js

/*jshint node:true, laxcomma:true */
/*global describe:true, it:true */
"use strict";

var debug = require('debug')('rwc:test');
var assert = require('assert');

var rwc = require('../lib/random-weighted-choice');

var randomCounter = 0;
var randomValues = [0,0.19,0.5,0.7,0.9];
var randomMock = function(values, reset) {
  if(typeof(values)=="undefined") values = randomValues;
  if (typeof(reset)=="undefined") reset = false;
  if (reset) randomCounter = 0;
  return values[randomCounter++];
};


describe('Temperature 50', function () {
  var table = [
        { weight: 1, id: "item1"} // Element 1
      , { weight: 1, id: "item2"} // Element 2
      , { weight: 4, id: "item3"} // Element with a 4 times likelihood
      , { weight: 2, id: "item4"} // Element 4
      , { weight: 2, id: "item5"}
    ];

  it('should return "item1"', function (){
    assert.equal('item1', rwc(table,null,randomMock));
  });
  it('should return "item2"', function (){
    assert.equal('item2', rwc(table,null,randomMock));
  });
  it('should return "item3"', function (){
    assert.equal('item3', rwc(table,null,randomMock));
  });
  it('should return "item4"', function (){
    assert.equal('item4', rwc(table,null,randomMock));
  });
  it('should return "item5"', function (){
    assert.equal('item5', rwc(table,null,randomMock));
  });
});


describe('Empty table', function () {
  it('should return null', function () {
    assert.equal(null, rwc([]));
  });
});


describe('One element', function () {
  it('should return the element', function () {
    assert.equal('a', rwc([{weight:1, id: 'a'}]));
  });
});

describe('No weight', function () {
  it('should return null', function () {
    assert.equal(null, rwc([{weight:0, id: 'a'}]));
  });
});

module.exports.random = randomMock;