Force npm test to make fresh\new copy of input

Question

Force npm test to make fresh\new copy of input

test/
├── TestOne.js
└── TestTwo.js

Say, TestOne.js is :

This test case reads from file InputOne.json and add one record to the object which already has 3 records.

describe('Add Items', function () {
      it('Should add items', function () {
       var input = require('./data/InputOne');
       var obj = new Department();
       var result = obj.AddDept(input);
       result.should.have.length(4);
      });
   });

Say, TestTwo.js is :

This test case reads from file InputOne.json and count the no of elements

describe('Count Items', function () {
      it('Should count items length', function () {
       var input = require('./data/InputOne');
       var obj = new Department();
       var result = obj.CountDept(input);
       result.should.have.length(3);
      });
   });

Problem:

Both the test cases uses same file as input. If I run test cases using mocha both the test cases passes

mocha TestOne // Passes

mocha TestTwo // Passes

if I say npm test (which runs all the test cases) I get error as test case in TestOne file has modified the input file. How I can make test case not to cache input file (or force test case to create its own copy of input file)

javascript
node.js
jasmine
mocha

Answer 1

To ensure the file is always loaded in its current form from disk, load it with fs:

var fs = require('fs');

var input = fs.readFileSync('./data/InputOne');
input = JSON.parse(input);

http://nodejs.org/api/fs.html#fs_fs_readfilesync_filename_options