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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.

Background: ElementObjects


[caption id="" align="alignnone" width="467" caption="util.elements package structure"]ElementObject 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:
[crayon-544ba4279edbe/]
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:
[crayon-544ba427a3047/]
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.
[crayon-544ba427a5bb2/]
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:
[crayon-544ba427a5dd6/]
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:
[crayon-544ba427a6c92/]
[crayon-544ba427a6ec2/]
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:
[crayon-544ba427a88e0/]
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:
[crayon-544ba427a89ca/]
Next up: what the heck is this BrowserDriver thing, and how might we use it.

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[Part of a series of posts on Java Selenium RC patterns I find useful.]

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:
[crayon-544ba427cf95a/]
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).

Glance-Readability


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):
[crayon-544ba427cfe6c/]

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:
[crayon-544ba427d025f/]
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:
[crayon-544ba427d051a/]
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:
[crayon-544ba427d0814/]
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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