How to reproduce javascript test failure

scenario.md

Steps to Reproduce

TheContract.sol

pragma solidity ^0.4.23;

contract TheContract {
  struct Object {
    address createdBy;
    uint balance;
  }

  Object[] public objects;

  mapping (address => uint) countByOwner;

  function createNewObject(address _owner, uint _balance) public {
    objects.push(Object(_owner, _balance));
    countByOwner[_owner]++;
  }

  function getObjectsCountByOwner(address _owner) external view returns (uint) {
    return countByOwner[_owner];
  }

  function getObjectsByOwner(address _owner) external view returns (uint[]) {
    uint[] memory result = new uint[](countByOwner[_owner]);

    uint counter = 0;
    for (uint i = 0; i < objects.length; i++) {
      if (objects[i].createdBy == _owner) {
        result[counter] = i;
        counter++;
      }
    }
    return result;
  }
}

theContract.js

var TheContract = artifacts.require('./TheContract.sol');

contract('TheContract', function (accounts) {
  const tester = accounts[0];

  it('should create new objects by tester', function() {
    let theContract;

    return TheContract.deployed()
      .then((instance) => {
        theContract = instance;

        return theContract.createNewObject.call(tester, 1)
      })
      .then(() => {
        return theContract.createNewObject.call(tester, 2)
      })
      .then(() => {
        return theContract.getObjectsCountByOwner.call(tester)
      })
      .then((count) => {
        assert.equal(count.toNumber(), 2, 'Object count hasn\'t set properly')
      })
  })
})

TestTheContract.sol

pragma solidity ^0.4.23;

import "truffle/Assert.sol";
import "truffle/DeployedAddresses.sol";
import "../contracts/TheContract.sol";

contract TestTheContract {
  function testCreateNewObject() public {
    TheContract theContract = TheContract(DeployedAddresses.TheContract());

    address tester = 0x24226C148f9ac4F0B46a9eeD8a426a6D9B9794c3;

    theContract.createNewObject(tester, 1);
    theContract.createNewObject(tester, 2);
    Assert.equal(theContract.getObjectsCountByOwner(tester), 2, "Object count hasn't set properly");
  }
}

and then

$ truffle test