Test based on the outcome of the device capabilities, eg. absence or presence of network

controller.js

//
// This gist explains how to test alternate paths based on device capabilities which are not under your control, 
// eg. presence of network, network quality(3G, Edge, GPRS), ...
//

// 
// When this code would be executed in the titanium runtime, the only way to test both code branches is by switching 
// the network on/off.
// 
function isNetworkPresent(){
  if(_.isEqual(Ti.Network.NETWORK_NONE, Ti.Network.getNetworkType()){
    Ti.API.warn('Please connect to a network and try again');
    return false;
  } else {
    Ti.App.fireEvent('bar');
    return true;
  }
}

controller_spec.js

//
// Both cases can be tested without manually intervening on the device/simulator
//
describe('network.availability test', function() {

  Ti = require('tiunit/jsca.api.parser').parse();

    var controller;

    beforeEach(function () {
      controller = require('../app/controller');
      spyOn(Ti.API, 'warn');
      spyOn(Ti.App, 'fireEvent');
    });

    it('returns true when there is no network available', function() {
        spyOn(Ti.Network, 'getNetworkType').and.returnValue(Ti.Network.NETWORK_NONE);
      
        var result = controller.isNetworkPresent();

        expect(result).toBe(false);
        expect(Ti.API.warn).toHaveBeenCalledWith("Please connect to a network and try again");
    });

    it('returns true when there is network available', function(){
        spyOn(Ti.Network, 'getNetworkType').and.returnValue(Ti.Network.NETWORK_WIFI);

        var result = controller.isNetworkPresent();

        expect(result).toBe(true);
        expect(Ti.App.fireEvent).toHaveBeenCalledWith("bar");
        expect(Ti.API.warn).not.toHaveBeenCalled();
    });

});