I was vaguely annoyed to see this blog article Buy protonix without prescription, featured in JavaLobby's recent mailout. Not because Kevin Pang doesn't make some good points about the limits of code coverage, Protonix online sale, but because his title is needlessly controversial. And, because JavaLobby is engaging in some agile-baiting by publishing it without some editorial restraint.

In asking the question, protonix online cheap, "Is code coverage all that useful, Buy protonix pills, " he asserts at the beginning of his article that Test Driven Development (TDD) proponents "often tend to push code coverage as a useful metric for gauging how well tested an application is." This statement is true, but the remainder of the blog post takes apart code coverage as a valid "one true metric," a claim that TDD proponents don't make, order protonix in canada, except in Kevin's interpretation.

He further asserts that "100% code coverage has long been the ultimate goal of testing fanatics." This isn't true. Protonix buy drug, High code coverage is a desired attribute of a well tested system, but the goal is to have a fully and sufficiently tested system. Code coverage is indicative, purchase protonix no rx, but not proof, Online pharmacy protonix, of a well-tested system. How do I mean that, buy protonix without prescription. Any system whose authors have taken the time to sufficiently test it such that it gets > 95% code coverage is likely (in my experience) thinking through how to test their system in order to fully express its happy paths, edge cases, order protonix no prescription, etc. Buy protonix on line, However, the code coverage here is a symptom, not a cause, get protonix, of a well-tested system. Protonix no online prescription, And the metric can be gamed. Actually, when imposed as a management quality criterion, real protonix without prescription, it usually is gamed. Buy protonix without prescription, Good metrics should confirm a result obtained by other means, or provide leading indicators. Order cheap protonix, Few numeric measurements are subtle enough to really drive system development.

Having said that, I have used code-coverage in this way, but in context, buy protonix in us, as I'll mention later in this post.

Kevin provides example code similar to the following:

String foo(boolean condition) {    if (condition)        return "true";    else        return "false";}

... Order protonix in us, and talks about how if the unit tests are only testing the true path, then this is only working on 50% coverage. Good so far, buy protonix us. But then he goes on to express that "code coverage only tells us what was executed by our unit tests, Protonix overnight shipping, not what executed correctly." He is carefully telling us that a unit test executing a line doesn't guarantee that the line is working as intended. Um.., buy protonix without prescription. that's obvious. And if the tests didn't pass correctly, protonix cost, then the line should not be considered covered. Buy protonix cheap, It seems there are some unclear assumptions on how testing needs to work, so let me get some assertions out of the way...

1. Code coverage is only meaningful in the context of well-written tests. It doesn't save you from crappy tests.
2. Code coverage should only be measured on a line/branch if the covering tests are passing.
3. Code coverage suggests insufficiency, buying generic protonix, but doesn't guarantee sufficiency.
4. Test-driven code will likely have the symptom of nearly perfect coverage.
5. Test-driven code will be sufficiently tested, Find protonix, because the author wrote all the tests that form, in full, the requirements/spec of that code.
6. Perfectly covered code will not necessarily be sufficiently tested.

What I'm driving at is that Kevin is arguing against something entirely different than that which TDD proponents argue, low cost protonix. Buy protonix without prescription, He's arguing against a common misunderstanding of how TDD works. On point 1 he and I are in agreement. Protonix free sample, Many of his commentators mention #3 (and he states it in various ways himself). His description of what code coverage doesn't give you is absurd when you take #2 into account (we assume that a line of covered code is only covered if the covering test is passing). But most importantly - "TDD proponents" would, discount protonix no rx, in my experience, Protonix from canada, find this whole line of explanation rather irrelevant, as it is an argument against code-coverage as a single metric for code quality, and they would attempt to achieve code quality through thoroughness of testing by driving the development through tests, find cheap protonix online. TDD is a design methodology, not a testing methodology, buy protonix without prescription. You just get tests as side-effect artifacts of the approach. Protonix india, Useful in their own right. Sure, but it's only sort of the point, protonix pharmacy online. It isn't just writing the tests-first.

In other words - TDD implies high or perfect coverage. But the inverse is not necessarily true.

Buy protonix without prescription, How do you achieve thoroughness by driving your development with tests. Find discount protonix, You imagine the functionality you need next (your next increment of useful change), and you write or modify your tests to "require" the new piece of functionality. They you write it, find protonix without prescription, then you go green. Protonix australia, Code coverage doesn't enter into it, because you should have near perfect coverage at all times by implication, because every new piece of functionality you develop is preceded by tests which test its main paths and error states, cheap protonix in usa, upper and lower bounds, Protonix pharmacy, etc. Code coverage in this model is a great way to notice that you screwed up and missed something, but nothing else.

So, drug protonix online purchase, is code-coverage useful. Heck yeah, buy protonix without prescription. Protonix online review, I've used coverage to discover lots of waste in my system. I've removed whole sets of APIs that were "just in case I need them" APIs, because they become rote (lots of accessors/mutators that are not called in normal operations), buy protonix low price. Is code coverage the only way I would find them. Compare protonix prices, No. Buy protonix without prescription, If I'm dealing with a system that wasn't driven with tests, or was poorly tested in general, I may use coverage as a quick health meter, but probably not. Going from zero to 90% on legacy code is likely to be less valuable than just re-writing whole subsystems using TDD... and often more expensive.

Regardless, buy protonix online australia, while Kevin is formally asking "is code coverage useful?" he's really asking (rhetorically) is it reasonable to worship code coverage as the primary metric. Buy protonix no prescription required, But if no one's asserting the positive, why is he questioning it. He may be dealing with a lot of people with misunderstandings of how TDD works, buy protonix overnight delivery. He could be dealing with metrics bigots, buy protonix without prescription. He could be dealing with management-imposed-metrics initiatives which often fail. It might be a pet peeve or he's annoyed with TDD and this is a great way to do some agile-baiting of his own. I don't know him, so I can't say. His comments seem reasonable, so I assume no ill intent. But the answer to his rhetorical question is "yes, but in context." Not surprising, since most rhetorically asked questions are answerable in this fashion. Hopefully it's a bit clearer where it's useful (and where/how) it's not.

(This article is a cross-post from "Geek in a Suit")

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