Titanium: Detect whether you're running in an emulator or not.

detect-if-emulator.js

// Detect whether we're running inside a simulator or not.
// Put this in your app.js or alloy.js
function isEmulator() {
    return (Ti.Platform.manufacturer == 'Genymotion' || Ti.Platform.model == 'Simulator');
}

// Use it to create mocks, for example:

function Foo() {
  this.init();
}

if (!isEmulator()) {
  Foo.prototype = _.extend(Backbone.Events, {
    init: function() {
      // do some device only stuff here
    }
  });
} else {
  Foo.prototype = _.extend(Backbone.Events, {
    init: function() {
      // Mock the original Foo and it's methods.
    }
  });
}

module.exports = Foo;