chai-properties.js

(function (plugin) {
  'use strict';

  if (typeof require === 'function' &&
      typeof exports === 'object' &&
      typeof module === 'object') {
    // NodeJS
    module.exports = plugin;
  } else if (typeof define === 'function' && define.amd) {
    // AMD
    define(function () {
      return plugin;
    });
  } else {
    // Other environment (usually <script> tag): plug in to global chai instance directly.
    chai.use(plugin);
  }
}(function (chai, utils) {
  'use strict';

  var _;

  if (typeof window === 'object' &&
      typeof window._ === 'function') {
    // browser-side
    _ = window._;
  } else {
    // server-side
    _ = require('lodash');
  }

  var flag = utils.flag;
  var inspect = utils.inspect;

  chai.Assertion.addMethod('properties', function(expected) {
    var obj = flag(this, 'object');

    if (flag(this, 'negate')) {
      throw new Error('Not implemented yet.');
    }

    function check(testDescr, testVal) {
      try {
        return _.every(testDescr, function (val, attr) {
          if (!(attr in testVal)) {
            throw new Error('No ' + attr + ' in ' + inspect(testVal));
          }

          if (typeof val !== typeof testVal[attr]) {
            throw new Error('Types are incompatible (' + (typeof val) + ' vs ' + (typeof testVal[attr]) + ')');
          }

          if (_.isArray(val)) {
            if (_.size(val) !== _.size(testVal[attr])) {
              throw new Error('Array sizes are incompatible (' + _.size(val) + ' vs ' + _.size(testVal[attr]) + ')');
            }

            return check(val, testVal[attr]);
          }

          if(_.isDate(val) && _.isDate(testVal[attr])){
            return val.getTime() === testVal[attr].getTime()
          }

          if (_.isObject(val)) {
            return check(val, testVal[attr]);
          }

          if (val !== testVal[attr]) {
            throw new Error('Values are incompatible (' + inspect(val) + ' vs ' + inspect(testVal[attr]) + ')');
          }

          return true;
        });
      } catch (e) {
        return false;
      }
    }

    function diffFn(testDescr, testVal) {
      return _.transform(testVal, function (result, val, key) {
        if (!_.has(testDescr, key)) {
          return;
        }

        if (_.isObject(val)) {
          var innerDiff = diffFn(testDescr[key], val);
          if (_.size(innerDiff)) {
            result[key] = innerDiff;
          }
          return;
        }

        result[key] = val;
      }, {});
    }

    //var diff = _.pick(obj, _.keys(expected));
    var diff = diffFn(expected, obj);
    var moreMessage = _.size(diff) ? ', but found ' + inspect(diff) : '';

    this.assert(
      check(expected, obj),
      'expected ' + inspect(obj) + ' to have properties ' + inspect(expected) + moreMessage,
      'expected ' + inspect(obj) + ' to not have properties ' + inspect(expected) + moreMessage,
      expected,
      obj,
      true
    );
  });

  //export tdd style
  var assert = chai.assert;
  assert.haveProperties = function (val, exp, msg) {
    new chai.Assertion(val, msg).to.have.properties(exp);
  };
}));