Support dotted-object creation

[t-bone]

It's becoming increasingly common for pages to use a new style of Google Analytics ( http://www.google.com/analytics/ one example of this style) that does something like this:

var pageTracker = _gat._getTracker("...");

After including a script that defines _gat. If this script is blocked, the above line generates a JS error. Karma blocker's "function inject" feature is designed to mask these errors, but does not support defining a function in an otherwise nonexistent object. This rule:

[Inject]
function='_get._getTracker'

Should inject (if it does not exist) an empty _gat object, then define a _getTracker property, as a null function.

[t-bone]

(In [509]) Refs #253

• Allow "dotted objects" (i.e. _gat._getTracker) to be injected, not just simple single names.

[t-bone]

Only now that I can inject _gat._getTracker, do I realize that it returns an object, and the script continues to call (i.e.) pageTracker._setCookiePath("/analytics/");, and of course _setCookiePath is not a property of the undefined return of my injected function. Not sure if there's any decent way to solve this in general.

[t-bone]

With the help of the StackOverflow community, I found __noSuchMethod__, which allows me to solve this perfectly!

[t-bone]

(In [523]) Fixes #253

• Using __noSuchMethod__, create an injected function that will allow all properties of it to be called, and return a function with this property as well. This makes the Google Analytics script not throw errors!