Testing from a file, Jasmine

account.js

var fs = require('fs');

function Account(file) {
  this._file = file;
}

Account.prototype.readfile = function () {
  if (!this._file) {
    throw new Error('File not found')
  }

  this._data = fs.readFileSync(this._file, 'utf8')

  return true
}

Account.prototype.toDowncase = function () {
  return this._data.toLowerCase()
}

Account.prototype.removeWords = function () {
  return this._data.replace(/\W/g, " ")
}

module.exports = Account;

account.spec.js

var Account = require('../../lib/test');
var fs = require('fs')

describe('wordCount', function () {
  var account;
  var file = '/path/to/file';

  beforeEach(function () {
    account = new Account(file);
  });

  describe("When changing the format of the text file", function () {
    it('will change all the words to lowercase', function () {
      spyOn(fs, 'readFileSync').and.returnValue('Hello World');

      account.readfile();
      var actual = account.toDowncase(file)

      expect(actual).toEqual('hello world');
    });

    it('will remove non-words', function () {
      spyOn(fs, 'readFileSync').and.returnValue('Hello#World');

      account.readfile();
      var actual = account.removeWords()

      expect(actual).toEqual('Hello World');
    });
  });
});