I Feel a Framework Coming On
Azithromycin (Zithromax) For Sale, [Agile Programming: Lesson One, Part Four]
I've been pitching to the world this notion of a gradual ascent into programming excellence, starting with just a bit of refactoring the innards of classes in a small problem space, and just a bit of test-driving in the same problem space.
I ask people to do the exercises, Azithromycin (Zithromax) price, keeping methods really, really small, and really simple, real brand Azithromycin (Zithromax) online. But up until now, Azithromycin (Zithromax) results, if someone asked, Got a Test for That?, my answer, purchase Azithromycin (Zithromax), sadly, After Azithromycin (Zithromax), was No, Sorry, Use Static Analysis Tools - There Are Tons of Them Out There, rx free Azithromycin (Zithromax). Lame answer. Azithromycin (Zithromax) no rx, Inspired (again) at a recent CodeMash by another whack at the excellent Ruby Koans, and having heard great things about similar Scala Koans, I wanted a koans-ish learning tool for refactoring, cheap Azithromycin (Zithromax) no rx. You know what's cool and fun about these koans, Azithromycin (Zithromax) For Sale. Everything, Online Azithromycin (Zithromax) without a prescription, that's what. Learning should be fun. Yes, Azithromycin (Zithromax) pics, that's right. Where can i buy cheapest Azithromycin (Zithromax) online, You heard it here first. Azithromycin (Zithromax) For Sale, These test-based koans are super fun.
When I asked people to keep methods under some number of lines of code, and under some cyclomatic complexity threshold, Azithromycin (Zithromax) long term, I Wanted a Test for That. Comprar en línea Azithromycin (Zithromax), comprar Azithromycin (Zithromax) baratos, And now, indeed, I do, herbal Azithromycin (Zithromax). I have two Whack-A-Method exercises; one for refactoring a sub-optimal implementation of BankOCRKata, Azithromycin (Zithromax) from canadian pharmacy, and another for continuing to test-drive a pretty-good-so-far partial implementation of the BankOCRKata. The first exercise has a couple of really Eager end-to-end tests, but Hey, Azithromycin (Zithromax) treatment. They give you 100% Code Coverage, Azithromycin (Zithromax) For Sale. Yay for anything. Azithromycin (Zithromax) price, coupon, So, these are Eclipse projects. If you have Eclemma installed, Azithromycin (Zithromax) dangers, then you can pull down Coverage As > JUnit Test, Azithromycin (Zithromax) wiki, and behold: you see your code coverage, of course. And in either Whack-A-Method exercise, purchase Azithromycin (Zithromax) online no prescription, you see the results of the tests for current production code behavior, Taking Azithromycin (Zithromax), AND YOU ALSO see results of tests that automagically recurse through your output folders for .class files, and ask a little jarred-up, embedded static analysis tool called CyVis (Tx, online buying Azithromycin (Zithromax) hcl, Guys!) to instantiate a test case for each of your classes, Fast shipping Azithromycin (Zithromax), and instantiate a different test case for each of your methods. Azithromycin (Zithromax) For Sale, Because I used the Junit 4 built-in parameterized test runner extension, you don't get much info from the tests that run green, and you cannot (at least as yet) click through ugly classes or methods in the failures (though I've provided meaningful failure semantics).
But Hey. It's totally version 0.1, Azithromycin (Zithromax) cost, and it works OK. Buy Azithromycin (Zithromax) without a prescription,
Caveat Lector: Yes, We are Refactoring on Red
So, in the real world, buy Azithromycin (Zithromax) online no prescription, you never want to refactor on a red bar, Buying Azithromycin (Zithromax) online over the counter, because you cannot tell whether you are screwing up existing behavior.
And, on the other hand, online buying Azithromycin (Zithromax), in the world of koans and learning tools, Order Azithromycin (Zithromax) online c.o.d, tests are an awesomely addicting, engaging learning mechanism. So, friends, consider this current Whack-a-Method a proof of concept, Azithromycin (Zithromax) For Sale. It's easy to try, where can i find Azithromycin (Zithromax) online, requires no installation, Buy cheap Azithromycin (Zithromax) no rx, works right outa the box, and is fun.
But you must indeed distinguish between red bars in the tests that cover the production code, Azithromycin (Zithromax) trusted pharmacy reviews, vs whackAmethod red bars. Azithromycin (Zithromax) online cod, In this pair of exercises, it's OK if your whackAmethod tests are red while you refactor. The other tests are saving your bacon with respect to code behavior, Azithromycin (Zithromax) australia, uk, us, usa. Azithromycin (Zithromax) For Sale, It's not OK if those non-whackAmethod tests are red.
Of course, Azithromycin (Zithromax) from mexico, you are heading toward a green bar. And you want to get there as fast as you can, and stay there as much of the time as you can.
And ultimately this tool is likely to become plugins and extensions for editors like emacs and eclipse. Not because the world needs scads of additional source analysis plugins, but because most of them are as simple as a Saturn V rocket, and this one is dead simple. And for now, as I've said before, you really only need a couple of metrics, Azithromycin (Zithromax) For Sale.
Whack-Extract Till Green
In the refactoring Whack-A-Method exercise, you just keep extracting methods and classes until everything runs green. Easy. Try it and find out.
In the TDD Whack-A-Method exercise, you just keep test-driving your code till you have fulfilled all of the requirements in the Requirements.txt file, and you keep all the tests green as much of the time as you can.
Azithromycin (Zithromax) For Sale, Tweak the Thresholds, Once You Know What You're Doing
You can tweak the constants in CleanTestBase.java to tighten or loosen the method/class size and complexity thresholds. But please don't at first. The defaults help learning to happen.
Does it Eat its Own Dogfood?
Yes, it does. All the classes in the whackAmethod package are themselves fully Whack-A-Method compliant, given the default thresholds. Let's see a plugin do THAT, Azithromycin (Zithromax) For Sale.
A Bit of 0.1 Framework Fer Ya
So, if you want to try this experiment on any Java codebase of your own, you totally can, with minimal copy, paste, config (well, as far as I know today -- again, version 0.1).
- Copy the entire whackAmethod package from my test source-folder to your own test source folder. (If you want to refactor my source, go for it, lemme know, and I'll likely give you commit rights to the project).
- Copy the cyvis.jar and the asm-all-2.1.jar to your project and build path.
- Change the constant STARTING_DIRECTORY_NAME in RecursiveClassFileFinder.java to point to the root of your output folder (it currently defaults to "bin").
- Run the tests. The Whack-A-Method tests should all run.
- Contact me with any problems.
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Agile Programming: Lesson One (Part Three)
At the start of this series of posts Buy Adolan (Tramadol) Without Prescription, I suggested that those who really, really want to become Agile Programmers start with a couple of refactoring exercises. In another post I explained why I suggest this as a starting point. I'll reiterate here that I am suggesting that you perform those exercises several times, several ways, before you attempt the exercises coming up next, australia, uk, us, usa.
All done. OK. Cool, Buy Adolan (Tramadol) Without Prescription. Now, Adolan (Tramadol) steet value, three posts in, I'll introduce the ideas of microtests and Test-Driven Development (referring you to other sources for deeper dives into these large topics).
If you have been following along in code, as well as in your reading, you may by now have discovered and learned several things, is Adolan (Tramadol) safe. Here are a few, any one or two of which may have occurred to you:
- You would not really be safe trying to do those original refactoring exercises without the handful of tests that cover them.
- It's not hard to break existing tests if you keep running them after each little refactoring step
- The refactoring steps in the exercises can be pretty hard to do, even in those really small amounts of code.
- As you extract behavior into lots of new methods, My Adolan (Tramadol) experience, and perhaps into a few new classes, it would be really cool to have new, separate JUnit tests that cover those specific little behaviors.
- It can be tricky trying to determine how to keep test code itself clean and concise.
I suspect that after enough repetitions of those first exercises I suggested, one or more of these does occur to you. Let's dig into testing in the context of these kinds of observations, cheap Adolan (Tramadol).
By Microtests Buy Adolan (Tramadol) Without Prescription, , which term was coined by Mike (@GeePawHill) Hill, I mean the same thing that people like Mike Feathers and J.B. Rainsberger (and many other TDD thoughtleaders) mean by unit tests or isolation tests or programmer tests. So in Java, a JUnit test is a Microtest if it:
- Tests a single discrete behavior/responsibility ("in isolation")
- Runs completely in memory: does not touch databases, Japan, craiglist, ebay, overseas, paypal, GUI frameworks, file systems, or networks. Those other tests are frequently useful, but they are not microtests.
- Runs really, Adolan (Tramadol) maximum dosage, really fast. Fast enough means somewhere between 10 and 100 per second, or faster.
Vital Ends: Enough Microtests for a Production Codebase
Every production codebase desperately needs to have enough microtest coverage.
Your codebase has enough microtests if your code coverage (as previously discussed) is at least 85%, and your median test-method length and production method-length is really small (as previously discussed), and each test class and test method is itself SRP-compliant, and very experienced microtesters have looked over the entire test suite and pronounced it healthy.
There are leaps of faith for you to take here, admittedly, Buy Adolan (Tramadol) Without Prescription. Order Adolan (Tramadol) from mexican pharmacy, And that last clause is really fuzzy and subjective. I get it.
Nevertheless, I'll emphasize this:
Aside from the production code itself, there is no more important artifact for any codebase than its suite of microtests, generic Adolan (Tramadol). A codebase without enough microtests, as Feathers has pointed out, is by definition Legacy Code. Buy Adolan (Tramadol) Without Prescription, Agile Programmers are careful about microtests the way veteran skydivers are careful about packing parachutes. Buy Adolan (Tramadol) no prescription,
Again, an exhaustive suite of microtests are ends, worthy in their own right, for protecting us from introducing defects when we change code.
But as is very frequently discussed in agile circles, discount Adolan (Tramadol), Test-Driven Development (TDD), as a means to those ends, is important in other ways. Adolan (Tramadol) recreational,
Definition: Test-Driven Development (TDD)
Test-Driven Development is the practice and craft of writing tiny little microtests for production code before you write the production code itself. The practice has been covered exhaustively in other sources, so I'll only sketch it here, starting with its benefits. Again, prepare to make leaps of faith:
- TDD is the most efficient, least-expensive way to produce high-ROI, low-TCO suites of exhaustive microtests.
- TDD is the most efficient, least-expensive way to drive production code in the direction of high-ROI, low-TCO Clean Code.
- TDD and microtesting have layers of sophistication, auxiliary practices and techniques, and otherwise a world of richness of their own.
- Skilled TDD (and refactoring) completely change how you feel about programming, for the better.
- Only after you have written a few thousand microtests using TDD (and other practices) do those first four points above become experientially clear.
- For many programmers, TDD seems at first (perhaps for months) to be a maddening, fanatical waste of time, Buy Adolan (Tramadol) Without Prescription. It feels (to some) like walking backward up a staircase, Adolan (Tramadol) reviews, blindfolded, carrying a tray of expensive flute glasses full of expensive champagne. Senseless, Adolan (Tramadol) gel, ointment, cream, pill, spray, continuous-release, extended-release, in other words. But that does pass.
Yes, you can write tests last, after you have written production code. But in exercises coming up soon here, Adolan (Tramadol) without a prescription, I hope to provide you an opportunity to learn that this slows you down more than you can tolerate. Buy Adolan (Tramadol) Without Prescription, I'll also explain why that seems to be true.
One more thing: it can be very, very difficult to do real TDD, Doses Adolan (Tramadol) work, or to add or change code at all, in existing codebases with very low code coverage. Before continuing with this post/lesson, if you doubt what I just said, please consider attempting this exercise I created a few years ago, Adolan (Tramadol) no prescription. Then come back here and continue.
The TDD References
First, the references. TDD basics are covered on-line pretty darned well, Buy Adolan (Tramadol) Without Prescription. Adolan (Tramadol) brand name, The more advanced, sneaky design mechanisms behind it are covered (for the advanced reader) here and here and here and here.
Aside: My fave, fave intro to TDD online is @JamesShore 's "Let's Play" series. James models to us all expertise, Adolan (Tramadol) interactions, poise, fun, and best of all, Adolan (Tramadol) description, supreme openness and vulnerability. Also the desire for a pair. Buy Adolan (Tramadol) Without Prescription, You can follow these videos and learn enormous amounts (the pace of learning is different from what I am attempting here -- it's OK if you find yourself lost by him pretty fast; if you revisit these next year you likely won't be). You can also hear his cat whining about TDD in the background, if you listen carefully.
In all seriousness, Adolan (Tramadol) duration, in the opinion of some, James dives quickly into "TDD by the book," which is to say with very, Adolan (Tramadol) over the counter, very little up-front design. Note that, as James proceeds, given his level of skill, this is not a serious problem for him, order Adolan (Tramadol) no prescription. Master that he is, he can refactor himself out of any design misstep. This is not TDD at a novice level, Buy Adolan (Tramadol) Without Prescription. Also notice in this series of videos how deeply James dives into mastering the problem domain at hand. Buy generic Adolan (Tramadol), It is his deepening mastery of that domain, coupled with his TDD mastery, that allows his design to emerge in increments that might at first seem ungainly, but are in fact elegant.
TDD is also covered in a slew of great books, buy no prescription Adolan (Tramadol) online. Good ones in Java include (at least)
- Agile Java,
- TDD: a Practical Guide,
- TDD: By Example, Buy Adolan (Tramadol) without prescription,
- and my all-time fave: Test Driven.
No, you need not purchase and read all of these books. Buy Adolan (Tramadol) Without Prescription, Any one of them is likely sufficient to challenge you with Java TDD exercises and thinking for some time. And you need not purchase any of them this minute. But you will need at least one of them soon, both for tutorial and for reference, ordering Adolan (Tramadol) online. There is a completely different slew of books for test-driving in other languages, BTW. [More later.]
The Classic Red-Green-Refactor TDD Cycle
The classic TDD cycle is covered well, Adolan (Tramadol) alternatives, in all seriousness, in the wikipedia TDD write-up. When you are learning TDD, taking this grand leap of faith, stick to this cycle like glue, Buy Adolan (Tramadol) Without Prescription. Follow it blindly for a good long while. Internalize it.
If you need a little humor to keep you on track, where to buy Adolan (Tramadol), you can use this handy on-line "pair partner" to remind you where you are in the cycle.
A New Rule to Follow in Our Challenges
We've been working in the BankOCR Kata for awhile now. Buy Adolan (Tramadol) Without Prescription, We've been refactoring existing code. As we go, Adolan (Tramadol) images, we've been adhering to certain rules (paraphrased here, for our next challenges):
- Keep all tests running green as much as possible. Also try to purposefully break them sometimes, to see what kinds of coverage they give you in the code (more on that later, too).
- Rename each entity (project, Adolan (Tramadol) canada, mexico, india, package, class, method, Adolan (Tramadol) class, variable) at least twice, as you learn more and more about what it should be doing
- By the time you are done, no method should contain more than 8 lines of code (this also applies to test methods), and most methods should be in the neighborhood of 4 or 5 lines of code, including declarations and return statements, Adolan (Tramadol) overnight. This includes test methods.
- Don't let code coverage fall below 85%.
As we switch to test-driving brand-new code, the rules above still apply. To this I'll add a new rule, Adolan (Tramadol) for sale, for the test-driven code:
- Test-drive classes that contain only a single public method, no more than 3 fields, and no more than 4 private helper methods. Try to avoid accessors (getters and setters), Buy Adolan (Tramadol) Without Prescription. Can you avoid them. If not, Adolan (Tramadol) schedule, why not?
Your Next Challenges
Start by ignoring the design you have been working with in the first exercises. Empty your mind of design ideas for the BankOCR Kata. Start with this new, nearly fresh version of an implementation, which can now help you with the special love provided by the Whack-A-Method testing mechanism.
Try test-driving just one part of the BankOCR Kata Buy Adolan (Tramadol) Without Prescription, at a time, and in this order (for now):
- Test-drive code that parses a bunch of raw OCR-like String data (represented however you like) into separate OCR digits. Remember the input data looks like this:
- How many classes does this need. I mean, if they are really, really small, SRP-compliant classes?
- Next, test-drive code that converts those individual OCR digits into integers. Again, how many classes do you need. How do you know?
- Finally, test-drive code that converts groups of those OCR digits into proper account numbers.
Now, after having done that the above way, throw away all the code, and do it in reverse. Is that harder. Easier.
Remember to follow all of the above rules. And stay tuned, next, for some more deep dive into emergent design: the magic thing that happens as we begin to master TDD, Clean Method Hierarchies, and Clean Code generally.
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[Part of a series of posts on Java Selenium RC patterns I find useful Buy Rimonabant (Acomplia) Without Prescription, .]
In the last post, we looked at self-verifying PageObjects: Java classes that are "testable representations" of a web app page, and that automatically verify for us, on instantiation, that we have indeed arrived on the actual web page we intended to.
So how do we handle page flow. I've handled it numerous ways in the past. Rimonabant (Acomplia) recreational, I don't like any of them anymore. Ultimately what I wanted, and now have, is something that mimics the way an actual <a href></a> takes you to a new page: classes that represent html links that, buy cheap Rimonabant (Acomplia), when clicked by Selenium, take you (predictably) to new PageObjects or pane objects. So the Selenium RC Java mechanics for page flow are no longer cluttering the test code, nor, in fact, the PageObjects, Buy Rimonabant (Acomplia) Without Prescription. Rimonabant (Acomplia) forum, Instead, I use what I call ElementObject classes. PageLink and DhtmlLink classes, in particular, Rimonabant (Acomplia) interactions, behave like little Factories. When instantiated, Order Rimonabant (Acomplia) online c.o.d, these objects are told which PageObject to instantiate when Selenium "clicks" on the actual html links those classes represent. Whew. Buy Rimonabant (Acomplia) Without Prescription, Confused yet. Let's see some code, starting with a package structure, where can i order Rimonabant (Acomplia) without prescription, and let's explain ElementObjects more generally.
[caption id="" align="alignnone" width="467" caption="util.elements package structure"][/caption]
Above are the ElementObject classes I use, Rimonabant (Acomplia) description, in HTMLUnit style, to represent discrete html element varieties and their behaviors.
(Note: The introductory post in this series tells you how to get all of this code. If you have the code, buy Rimonabant (Acomplia) online no prescription, explore this little object tree, starting with the abstract BaseElement class. Explore how different pages and panes use these element classes.)
Let's tour a slice of the BaseElement tree briefly, Buy Rimonabant (Acomplia) Without Prescription. Doses Rimonabant (Acomplia) work, Here is the abstract BaseElement class:
So all elements, since they extend BaseElement, have locators (which are all CSS selectors, as discussed in the previous post), Rimonabant (Acomplia) duration. The isPresent() method (using the conventional Selenium isElementPresent() method), uses vanilla Selenium to reveal whether any element is indeed present in the browser's representation of the HTML, Rimonabant (Acomplia) trusted pharmacy reviews, rendered (usually) by a real HTTP Request/Response cycle. Similarly, isVisible() reveals whether an element is "visible" after any dynamic call that does NOT involve a real HTTP Request/Reponse cycle. Under the covers, Rimonabant (Acomplia) from mexico, isVisible() uses jQuery to check visibility in the in-memory DOM. Buy Rimonabant (Acomplia) Without Prescription, The short answer to "Why have both?" is that isVisible() is heavier-weight and slower, but usually works when isPresent() does not. The even shorter answer is that browser manufacturers hate each other, Buy Rimonabant (Acomplia) without prescription, and sometimes ignore the w3c, but they all standardize on jQuery.
So, for example, Rimonabant (Acomplia) blogs, ClickableElement extends BaseElement, and adds just a predictable smidgeon of clickable-ness:
And further down the tree, Buying Rimonabant (Acomplia) online over the counter, a CheckBox gives us the ability to check a checkbox, or if it is one of those fancy graphical checkbox simulacra, we can just click() on it using the inherited method in ClickableElement. Either way, after Rimonabant (Acomplia), we have checkbox-looking things covered.
Notice all of the static method calls to BrowserDriver.java. We'll cover him in deep detail later, but he is our Decorator/Facade for Selenium and jQuery calls, Buy Rimonabant (Acomplia) Without Prescription. Rimonabant (Acomplia) price, coupon, It provides singleton access to DefaultSelenium and several of its useful methods, as well as several convenience methods we have found useful.
The point here is that only down at the ElementObject level does our framework "know" about BrowserDriver, and the nuts-and-bolts mechanics of getting Selenium (or whatever frameworks we want) to do stuff to real web page elements, fast shipping Rimonabant (Acomplia).
And of course the most essential point is that in our PageObjects, we can represent every HTML element as one of these types, Is Rimonabant (Acomplia) addictive, keeping the test framework code nice and DRY.
In general, this is how the ElementObjects work. Buy Rimonabant (Acomplia) Without Prescription, Caveat Lector: I don't have a full, complete set of these in my sample code; I have the ones I have been using all the time. Feel free to extend this package as necessary (and to send me your contributions), Rimonabant (Acomplia) dose.
PageLinks and DhtmlLinks
Now the meat of this post: how do we get from page to page.
First let's look at how a PageLink client uses it for a field on a PageObject. Rimonabant (Acomplia) over the counter, Let's look at a test for creating a Task in FatFreeCRM:
Note in the setUp() method that we get to a TasksPage by clicking clickToNewPage() on the tasks field on a MainNavigationTabsSet class, which looks like this:
Note that tasks field is of type PageLink, parameterized with a class. And notice that when you instantiate a PageLink, you call a PageLink.create() method, Buy Rimonabant (Acomplia) Without Prescription. Between these two things, cheap Rimonabant (Acomplia), we ensure that when we ask Selenium to click on that tasks link, we end up instantiating an actual TasksPage PageObject. Comprar en línea Rimonabant (Acomplia), comprar Rimonabant (Acomplia) baratos, It's a smidge confusing, perhaps. Bear with me. Here is the PageLink class:
Notice that PageLink extends ClickableElement, purchase Rimonabant (Acomplia) for sale, so whatever element a PageLink object represents, we can click on it. Buy Rimonabant (Acomplia) Without Prescription, Yay. Rimonabant (Acomplia) reviews, Notice also that when we instantiate PageLink, it expects a css locator.
Most critically and cryptically, notice all the Java generics magic, Rimonabant (Acomplia) images, which can be confusing Java syntax to many programmers. The upshot is noisy framework code, Real brand Rimonabant (Acomplia) online, but it keeps explicit casting out of the test code. It keeps the test code very simple indeed.
Now notice what happens when a test method calls the clickToNewPage() method: first, we click on ourselves (which will, if you look at click() in ClickableElement, get BrowserDriver to click on the locator we were instantiated with, Buy Rimonabant (Acomplia) Without Prescription. Then the tricky bits. We call clickToNewPage(), Rimonabant (Acomplia) samples, which asks BrowserDriver.waitForPageToLoad() to let us know when the new page is done loading. Because Selenium can tell when a real HTTP Request/Response cycle is done, Rimonabant (Acomplia) mg, this will work for real pages with actual, different urls.
Then, aha, Rimonabant (Acomplia) from canada. Our little Factory method uses a little lightweight Java Reflection Buy Rimonabant (Acomplia) Without Prescription, to construct and return us an instance of that PageObject whose Class we passed in on instantiation. In MainNavigationTabsSet above, you can see that the tasks PageLink is declared and instantiated with TasksPage.class. Rimonabant (Acomplia) description, So indeed, a self-verifying TasksPage PageObject gets constructed and handed back to test code when that test calls Common.mainNavTabsSet.tasks.clickToNewPage().
So a bit of Java design forethought gives us this ability to click on a tasks link, and proceed without further ceremony to a TasksPage, Rimonabant (Acomplia) online cod. Our page flow does, in fact, Purchase Rimonabant (Acomplia) for sale, much mirror the HTML and pages in the production code.
Our test code (above) is, again, succinct and expressive, and only a link to a page need know how to get there, Buy Rimonabant (Acomplia) Without Prescription. Just like in real life.
Similar to PageLink, DhtmlLink provides us a little factory for dynamic html behaviors (clickToNewContainer()), get Rimonabant (Acomplia), whether they have Ajax-like server conversations, or just change the html in the browser. Rimonabant (Acomplia) maximum dosage, In this case, because we don't have a real HTTP Request/Response cycle, we don't call waitForPageToLoad() on Selenium. Selenium has no idea whether the "page" or "pane" we need is now visible. Our PageObjects take care of that. We just click(). Like PageLink, DhtmlLink uses much of the same Java generics gobbletygook to keep track of concrete Class types to be instantiated at our request. In this case, the base class is BasePane, not BasePage:
Next up: what the heck is this BrowserDriver thing, and how might we use it.
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Adolan (Tramadol) For Sale, What we Want: Expressive, Succinct Tests
Let's say I want to test that I can log into an app. I want my Selenium RC Java test code to look something like this, Buy Adolan (Tramadol) without prescription, because I want it to read, aloud, the way I would describe actually logging in and checking that everything went mostly OK:
Several techniques make this possible, Adolan (Tramadol) wiki, but the one we will focus on in this blog post is the notion of a self-verifying PageObject, Japan, craiglist, ebay, overseas, paypal, which is essentially a "testable representation" of an actual web app page we wish to traverse, manipulate, and test, buy cheap Adolan (Tramadol) no rx. So my LoginPage class, Adolan (Tramadol) overnight, above, allows me succinct manipulation of the corresponding login page in the system under test.
Note that this test knows nothing about Selenium, comprar en línea Adolan (Tramadol), comprar Adolan (Tramadol) baratos. Indeed, Where can i find Adolan (Tramadol) online, neither does the LoginPage class (below). More on that later, Adolan (Tramadol) For Sale. Note that this test does not include any waitUntilPageIsFrickinLoaded() calls, nor (worse) Thread.sleep() code, Adolan (Tramadol) class, and very little direct instantiation of PageObjects. Where can i order Adolan (Tramadol) without prescription, The page flow mechanics is encapsulated elsewhere. Note also that as I go from page to page, I don't explicitly assert that I got there, Adolan (Tramadol) from mexico. I shouldn't have to. Adolan (Tramadol) For Sale, My test should be able to take that for granted. It turns out that assertions are being made under the covers about having arrived successfully on intermediate pages, but that code is abstracted away. Adolan (Tramadol) no prescription, That's what this post covers.
The only useful assertion in the test proper is that, once I have logged in with proper credentials, Adolan (Tramadol) gel, ointment, cream, pill, spray, continuous-release, extended-release, I arrive safely at the homepage (and even this assertion in the test is redundant, Ordering Adolan (Tramadol) online, and included here only to reveal intention; the DashBoard page is also self-verifying).
A test as short and expressive as the one above passes the "glance readability" test. Anyone familiar with automated testing semantics, Adolan (Tramadol) long term, and the biz language of this CRM domain, Adolan (Tramadol) over the counter, ought to be able to grasp what this test does at a single glance.
Suffice to say, we want our Selenium RC tests, as much as they can, to be this succinct, Adolan (Tramadol) For Sale. And, again, generic Adolan (Tramadol), that requires that they stick to expressing page traversal and manipulation in the local biz-specific language of the web app's business domain. So, Rx free Adolan (Tramadol), finally, let's see the under-the-covers page self-verification mechanics.
PageObjects as I Use Them
The selenium-rc-patterns sample Java codebase that illustrates all of the patterns in this series of posts talks to a localhost copy of a Rails project called Fat Free CRM, effects of Adolan (Tramadol). If you want to learn a bit about this app, Australia, uk, us, usa, you can play with a hosted sample version here (you have to sign up for an account first, which is easy).
This CRM system has discrete web pages like a Dashboard (home page, Adolan (Tramadol) for sale, essentially), Adolan (Tramadol) steet value, and pages for Tasks, Leads, Campaigns, buy generic Adolan (Tramadol), Contacts, Cheap Adolan (Tramadol) no rx, Accounts, and Opportunities. Adolan (Tramadol) For Sale, For each of these actual, production pages, my selenium-rc-patterns Eclipse project contains a matching PageObject with methods and fields that provide access to the services on that page.
Above, after Adolan (Tramadol), when you ask an instance of a LoginPage to login(username, Adolan (Tramadol) blogs, password), then the TextFields and PageLink type know how to return us a PageObject that should then be cast to a DashboardPage and returned. (More on that in another post.)
Selenium RC developers have been using a PageObject pattern for awhile, Adolan (Tramadol) dangers. The pattern dates back, Adolan (Tramadol) schedule, at least, to the original HTMLUnit, whose API rather strongly encourages you to represent your pages under test as extensions of what it calls an HtmlPage. I don't use Se 2 yet (might someday, purchase Adolan (Tramadol), might not), Where to buy Adolan (Tramadol), so I don't use its PageFactory pattern.
Instead, I use my own PageObjects that extend a BasePage (or BasePane), herbal Adolan (Tramadol), partly so that I can control how and when PageObjects are instantiated, Purchase Adolan (Tramadol) online no prescription, and verify automatically and ambiently on instantiation that Selenium is indeed on that page. Again, that's much of what keeps the above test code so simple: I'm not explicitly waiting for a page to load, and I'm not asserting all over the place that I've successfully arrived on a given page, Adolan (Tramadol) For Sale.
So, my LoginPage class has a login() method that accepts a username and password (we'll cover the return types of these fields and methods in another post that describes how page-flow works):
Verifying That the Production Page has Been Loaded
The real point of my flavor of PageObject pattern is the self-verifying bit, purchase Adolan (Tramadol) online. Let's dive into that -- not later, Order Adolan (Tramadol) from mexican pharmacy, but now.
Note that each of these PageObjects extends BasePane, and has a PAGE_IS_LOADED_CSS constant:
In the LoginPage constructor way above up there, Adolan (Tramadol) used for, you can see we first explicitly call super() on BasePane. Adolan (Tramadol) without prescription, Here is BasePane:
You can see that this constructor calls waitUntilLoaded(), which makes a static call to a method on our BrowserDriver (the Facade / Decorator that handles all of the actual Selenium calls) in order to loop until our LoginPage (in this case) actually is loaded. Adolan (Tramadol) For Sale, The argument supplied is the result of calling getPageLoadedCssLocator().
But wait. That's an abstract method. So Yes, we have something very like a template method pattern here in waitUntilLoaded(): the concrete implementation of getPageLoadedCssLocator() on LoginPage returns that PAGE_IS_LOADED_CSS constant String.
Deep, deep under the covers, the BrowserDriver.waitForElementIsVisible() method looks like this:
We'll discuss the BrowerDriver class at length elsewhere. And we'll also discuss the injectJqueryIfAbsent() method, which we hope an upcoming Selenium RC release will obviate.
The upshot of the waitForElementVisible() method and the LoginPage and BasePane code above is that the LoginPage object will not successfully finish instantiating until Selenium can successfully verify that a unique element on that page has been loaded. In other words, once a LoginPage instance is loaded in memory, we actually are on the LoginPage, by definition, as long as that CSS element selector syntax is correct, Adolan (Tramadol) For Sale. Voila, automatic, ambient page flow assertion.
This is much of how we get our test methods so succinct. The PageObjects take care of verifying for us, at instantiation, that we have safely arrived on their corresponding production app web pages.
Caveat Lector: there is a flaw in my code I have yet to squeeze out: duplication between a BasePane, used above, which I usually use for dynamic changes in the HTML, and a BasePage, which presumes that a real HTTP Request/Response cycle has occurred. I will collapse those two together shortly.
Next: we'll talk about reusable HTML Element objects, and how the linkish ones know, in my code, how to return the PageObject we wish to traverse to next.
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Rimonabant (Acomplia) For Sale, My opinion about through-the-web-GUI enterprise-app-testing, in general, is that it is like driving on ice in a blizzard: not something you want to do lots and lots of, because sooner or later you'll get into deep trouble. Online buying Rimonabant (Acomplia) hcl, But given your context (living in MI, for me), discount Rimonabant (Acomplia), Buy Rimonabant (Acomplia) from canada, driving on ice in the snow is something that is useful to know how to do well, in a pinch, buy Rimonabant (Acomplia) online cod. Rimonabant (Acomplia) australia, uk, us, usa, I've blogged in the past about low-TCO (Total Cost of Ownership) Selenium RC testing in general, and about how much of your automated testing budget should be allocated to different kinds of testing at different points in an agile transformation, Rimonabant (Acomplia) dosage. Rimonabant (Acomplia) pics, Of late, I have been helping teams learn to use Selenium RC, where can i buy cheapest Rimonabant (Acomplia) online, Rimonabant (Acomplia) dose, in Java, to test web apps through their GUIs, order Rimonabant (Acomplia) online overnight delivery no prescription. Rimonabant (Acomplia) no rx, Once the above Caveat Tester is spoken, I help them do the Selenium RC testing that they feel they MUST do as well as possible, Rimonabant (Acomplia) from canadian pharmacy.
I have been diving more deeply into it for several clients recently, and finding and refining some useful patterns I had not needed or found before (with the help of several colleagues), Rimonabant (Acomplia) For Sale. Rimonabant (Acomplia) photos, And, admittedly, Rimonabant (Acomplia) duration, Rimonabant (Acomplia) recreational, some of what I am doing is refining my old patterns in response to things like Refactoring pressure. In general, online buying Rimonabant (Acomplia), Order Rimonabant (Acomplia) from United States pharmacy, I am devising increasingly DRY Object Oriented Selenium RC Java patterns. I recently presented on them at Agile 2010. Using git, Rimonabant (Acomplia) reviews, Canada, mexico, india, you can checkout the code that illustrates these patterns from github here.
I intend to share each of these patterns with you, Rimonabant (Acomplia) pharmacy, Buy Rimonabant (Acomplia) online no prescription, each in its own blog post, in coming weeks, Rimonabant (Acomplia) without a prescription. My Rimonabant (Acomplia) experience, So watch this space for blog posts covering the following topics:
- Clean, clear test methods
- Separating DRY test-framework code from "wetter" tests, Rimonabant (Acomplia) use, Taking Rimonabant (Acomplia), and separating reusable, generic test-framework code from biz-domain-specific framework code
- Wrapping Selenium and other frameworks in Facade/Decorator that provides static Singleton test framework access.
- Pushing all framework static Singleton references down into base classes and html element classes.
- Biz-Domain-specific Page Objects that are "lazy loaded" and self-verifying, Rimonabant (Acomplia) street price, Doses Rimonabant (Acomplia) work, and that encourage Dry OO test code
- Always using CSS as a DOM element locator strategy; never using XPath.
- Injecting the entire jQuery framework into pages under test, in order to verify visibility of elements that appear after dynamic html or Ajax calls.
- Generic HTML Element objects (ala HtmlUnit's API) that encourage Dry OO test code
- DhtmlLink and PageLink Factory classes that are instantiated with the Page Object classes they should "go to, real brand Rimonabant (Acomplia) online, Rimonabant (Acomplia) alternatives, " and that automatically return those objects when "clicked".
- Pushing out access to common elements across several pages to static Singletons on base page classes.
The code I link to above illustrates all of these patterns, expecting (for now) to run against a demo instance of a Rails app called FatFreeCRM, no prescription Rimonabant (Acomplia) online, Buy Rimonabant (Acomplia) without a prescription, which is available for you to play with at http://demo.fatfreecrm.com/login. Order Rimonabant (Acomplia) no prescription. Online buy Rimonabant (Acomplia) without a prescription.
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