Example of desired behaviour of SinonJS onlyWithArgs() method

test.js

beforeEach(function() {
  global.fs = require('fs');
  sinon.stub(fs, 'readFileSync').onlyWithArgs('my-file.txt').returns('Contents of file');

  // Then require the module under test, which uses fs.readFileSync() internally
  // require() uses original method with correct calling context
  global.myModule = require('../src/my-module');
});

it('does something with the file', function() {
  expect(myModule.loadFromFile()).toEqual('Contents of file');
});