Expand spec description

spec/api-desktop-capturer-spec.js

@@ -5,7 +5,7 @@ assert = require('assert');
 desktopCapturer = require('electron').desktopCapturer;
 
 describe('desktopCapturer', function() {
-  return it('should returns something', function(done) {
+  return it('should return a non-empty array of sources', function(done) {
     return desktopCapturer.getSources({
       types: ['window', 'screen']
     }, function(error, sources) {