sinonjs mock example

var sinon = require('sinon'),
    support = require('appium-support'),
    Q = require('q'),
    chai = require("chai");
should = chai.should();

function actualLogic(cmd) {
  return support.core.exec("sleep 10000 && " + cmd).then(function(res) {
    return res[0].toUpperCase();
  });
}

describe('example', function() {
  it("should work", function() {
    var mock = sinon.mock(support.core);
    mock.expects("exec").once().withArgs('sleep 10000 && echo "hello world"').returns(new Q(['hello world', null]));
    return actualLogic('echo "hello world"').then(function(res){
      res.should.equal('HELLO WORLD');
    }).finally(function(){
      mock.verify();
      mock.restore();
    });
  });
});

(It also looks like @mentions don't work in gists?)