Improving Testability of GUI Code, an Eample

Mark Roddy 3 days later:

I’d suggest changing the validateUrl() method (later renamed validate) to accept the ‘String body’ variable as it’s argument.

This solves the problem of the method being aware of the user interface code (as does the TextSource interface), but it also removes the dependency on the external interface (ala Law of Demeter).

Brett L. Schuchert 5 days later:

Mark,

1. I like the idea of passing in the String. It does not resolve the problem of reporting both an error message and success or failure. There are ways around that. E.g., retuning a “result” object that has success/failure and the optional error message. That’s certainly an option. I’ve actually used both options in different systems and I cannot say that one is clearly better than the other. (Returning back a string that is empty for “success” and otherwise an error message is another option. I think that is a bit messy, but it would also certainly work.)

2. Law of Demeter violation. Passing in an interface is not a violation of the Law of Demeter. Sending message to that interface is also not a violation. There is a violation if I send message to the String I get back from the interface.

Violation of the Law of Demeter is a problem because it introduces structural coupling. Sometimes violating the law is a better option that the potential interface bloat that can be associated with not violating. Typically, for long chains, removing part of the violation is the best option. This example is not that situation, however.

In this case, the violation doesn’t seem too bad since the dependency is on a string. The risk of that needing to change is small, so the potential down side is small.

Technically for the UrlValidator there is no violation since it gets a string and the passes it to another object. It does not send a message, so no violation. I cannot get away with that in the other two validators, however.

So then the question is this: Is the violation of the Law of Demeter (sending message to the string) plus the introduction of an interface better or worse than returning a composite object (or a string which must be interpreted – let’s rule this option out – in real systems we typically return all errors not just one, so the string itself becomes a composite string – /ugly/).

I’m not sure there’s enough context to decide. We either introduce an interface or a concrete class (the return object). So no win there. There is the creation of an instance of a return object versus no object creation (plus in the pass in the interface option). Again, I’m not convinced that there’s enough to make a decision.

I think I still prefer the interface over passing in the string when considering that there are 2 return values (success/failure and error message). But, it certainly doesn’t rule out your suggestion. It’s just my preference

isaiah 13 days later:

Have you considered using a GUI testing framework such as http://code.google.com/p/windowlicker/

Brett L. Schuchert 15 days later:

isaiah,

Yes, of course. However, such tools are only one piece of an overall checking (to use Michael Bolton’s term) strategy.

The refactoring introduces a separation of concerns that should have been there in the first place. This allows for focused verification of functionality without having to resort to a “gui driver.”

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The refactoring introduces a separation of concerns that should have been there in the first place. This allows for focused verification of functionality without having to resort to a “gui driver.”

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I agree, this should only be one tool in a multi-valent set of strategic checking. I agree, in this instance, that passing in the string is a little dangerous when you have multiple return values.

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So then the question is this: Is the violation of the Law of Demeter (sending message to the string) plus the introduction of an interface better or worse than returning a composite object (or a string which must be interpreted – let’s rule this option out – in real systems we typically return all errors not just one, so the string itself becomes a composite string – /ugly/).

I’m not sure there’s enough context to decide. We either introduce an interface or a concrete class (the return object). So no win there. There is the creation of an instance of a return object versus no object creation (plus in the pass in the interface option). Again, I’m not convinced that there’s enough to make a decision.

I think I still prefer the interface over passing in the string when considering that there are 2 return values (success/failure and error message). But, it certainly doesn’t rule out your suggestion. It’s just my preferencecheap VPS

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