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From Igor Drobiazko <igor.drobia...@gmail.com>
Subject Re: Cool idea for testing ...
Date Tue, 19 Apr 2011 22:54:50 GMT
I've been using something similar for PageTester tests. Every time I need to
test something exceptional, I advise a service with a mock or stub. However,
In integration tests It wasn't that easy to accomplish the same.

On Tue, Apr 19, 2011 at 11:19 PM, Howard Lewis Ship <hlship@gmail.com>wrote:

> Wow. I just thought up a deviously useful idea for testing Tapestry apps.
> Here's the problem; sometimes your pages are calling into a service
> and need to handle some exceptional situation.  Maybe it is not
> reasonable to get the service to respond with the exceptional case ...
> in my situation, its about setting things up so that a database
> transaction is rolled back due to a stored procedure noticing a data
> irregularity that's pretty much impossible to set up through the UI.
> I still want to test the logic in my page that handle the exceptional
> response from the service, and I want to do it inside a Selenium-based
> integration test.
> I keep hearing "Uncle" Bob Martin whine "and why are our UI components
> talking to our service components" (roughly paraphrased, from memory).
> So I had this image pop into my head:
> 1) A mock implementation of the DAO service.
> 2) A special MockManager service that can temporarily store a Mock for
> a particular service interface.
> 3) A MethodAdvice on the service that checks with the MockManager and
> possibly redirects the method invocation from the real service
> implementation to the Mock.
> In other words, my test will obtain the service Registry (somehow) and
> the MockManager.  It will store a Mock of my DAO service into the
> MockManager.  My test then submits the form, and the page code invokes
> a method on the service which is directed to my Mock.
> I'll be prototyping this on my client code shortly, see how well it works.
> If this works, it will really justify the fine-grained DAO approach
> I've been using (pretty much each entity type has a cookie-cutter DAO
> service)
> --
> Howard M. Lewis Ship
> Creator of Apache Tapestry
> The source for Tapestry training, mentoring and support. Contact me to
> learn how I can get you up and productive in Tapestry fast!
> (971) 678-5210
> http://howardlewisship.com
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Best regards,

Igor Drobiazko

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