I'm very new to Unit testing and TDD. I'm clear with TDD concepts theoretically, but I'm having lots of impediments in implementing that. Most of the examples explains how to do unit testing for Multiply, adding two numbers, etc., which is not we really need in real time.
For angular, it is much better, we can check the values of array, existence of Controller, using the service, mocking the backend, etc., So now I have couple of questions,
How can do Unit testing for Backend process like how the request is being handled ?
My application mostly interacts with UI components, Can I use protractor in my TDD process, for example Drawing tool, how can I do testing without drawing(interacting) anything on it ?
There are many orm framework available in nodejs to generate testdata if you want to generate data in your traditional DB and use your backend as it is.
jugglingdb and sequelizejs are the most popular one.
Even to make it more manageable you can implement cucumber or jasmine framework with protractor, so you can manage after and before hookups for individual test-scenario.
Related
Hi one of my client needs unit tested application in asp .net webforms. But I have no Idea about how to start or unit tested applicaton/MVC. I would like to know how to create unit tested application in webforms. Any example, video, tutorial will be helpfull.
Thnaks
I suggest you do the following things:
Start asking your client and yourself what it is you want to achieve? Merely unit testing for no other reason than saying you are unit testing is not a worthy goal to pursue.
Read some introductory book like The Art Of Unit Testing to make yourself familiar with unit testing.
Consider reading this ASP.NET MVC book because it takes you through all layers of an ASP.NET MVC app while applying unit testing at each of those layers (with really good examples).
I agree with point 1 of meilke's answer. Adding unit testing to an existing application can be a lot of work and without a good reason, it's unlikely a customer will want to pay for it. It is possible however to use a request to add or remove functionality as an opportunity to get started. For example, if you have a task to remove some existing functionality then putting a set of unit tests in place to verify the existing behaviour of the application can save headaches later on. Think of it like putting scaffolding in place before doing construction work.
It's not clear from your question but if it's ASP.NET WebForms as distinct from ASP.NET MVC that you are looking to unit test, I would recommend looking into the Model View Presenter design pattern. Here and here are a couple of articles that should help.
I’m planning to build what will eventually be a large SPA with lots of data (in a grid).
It seems a good idea to use a MVC framework. I am mainly looking at AngularJS and EmberJS.
There are arguments for both, but it seems to me that EmberJS has some advantages that Angular does not. In particular, since I will have lots of data in a grid, I am afraid that choosing Angular will eventually cause me performance issues.
However, unit testing is also very important to me.
I haven’t been able to find much information about unit (not integration) testing of EmberJS.
Is Ember a significantly worse choice than Angular if unit testing is important? (As it currently stands)?
Please note that I am talking about unit tests, not integration tests. It seems to me that if I am going to build a large SPA, then it is important to test not just the surface of the app, but to be able to test each component/part/class individually and mock out the rest.
I've found unit testing in Ember to be relatively straightforward.
The are two things to make sure you understand in order to be successful writing Ember unit tests.
First, you will sometimes need to provide an object with a container (e.g. an Ember.DefaultContainer instance) when you create it for testing. The container is the crux of Ember's dependency injection mechanisms. Definitely need to learn about it.
Second, you will need to understand the Ember run loop in order to make sure the changes you make in your unit tests will propagate (e.g. computed properties with dependent keys becoming invalidated) before you assert that the new value is what you expect.
I would highly recommend reviewing the unit tests for Ember itself. You will find many useful techniques there.
We have a web application (using Grails/Groovy) and we write unit tests and functional tests.
However, we are not writing integration tests.
With unit tests, we can catch some small issues and also, it helps us writing our codebase in modular, short and readable fashion.
Functional tests obviously helps us to know when a feature is broken.
What would be get from writing integration tests? What would be the benefits of the extra time spent writing these tests?
The question is "What would be get from writing integration tests? What would be the benefits of the extra time spent writing these tests?"
Your integration tests will ensure that your components work together with cross cutting concerns such as web services, db, session etc. You only need only few integration tests - As #bagheera's comment on TestPyramid. Be aware how you write integration tests because if you go overboard, it can really slow to run all of them, and harder to work with. When you compare them to Unit Tests, you don't get much benefit of writing them.
Addtional :
You need lot of Unit Tests - you already have this and it is a good sign. You don't want tests in between this, which is called "dirty hybrids" http://blog.stevensanderson.com/2009/08/24/writing-great-unit-tests-best-and-worst-practises/
From:
http://martinfowler.com/bliki/TestPyramid.html
The pyramid also argues for an intermediate layer of tests that act
through a service layer of an application, what I refer to as
SubcutaneousTests. These can provide many of the advantages of
end-to-end tests but avoid many of the complexities of dealing with UI
frameworks. In web applications this would correspond to testing
through an API layer while the top UI part of the pyramid would
correspond to tests using something like Selenium or Sahi..
In addition to checking your application's plumbing as #Raedwald mentioned, integration tests are great for testing that your persistence layer is working as you expect. Are cascades set up correctly? Is everything rolled back properly if something blows up during a transaction? It's often much easier to directly check this stuff with an integration test rather than a functional test.
I find they are useful for checking the 'plumbing' of an application. For checking that your units are connected together and that delegating objects meet the preconditions of the methods they delegating to.
I have read/watched so much about TDD & BDD recently that I really want to master it. I have been a developer that only writes code and then tests it from outside (like we always started). The problem seems to be in getting up and running with TDD. I want to just create a simple Winform app in which I want to show a list of something lets say products. I just don't know where to get started, should I write a test for controller first? the controller needs reference to view and service and so on so forth. ASP.Net MVC is built for testing therefore it is a bit easy to get started but Winforms are a real pain. Kindly give me some Videos (Most preffered) that show TDD in Winforms.
I have watched tons of videos that show you testing a class or feature but how do you test UI that does not support testing?
In short I want to know if anyone has been doing TDD for a while, how
does he/she do it in Winforms?
I have written loads of code that I just delete because I get stuck, Please help!
Here's how I do it for any kind of UI, be it Web or Winforms or WPF or Swing in Java or even a web service interface that's going to be used by another system.
Write the UI, and hard-code any data behind it.
Write a controller, and move the hard-coded data to the controller. The controller should just be presenting the data in a form that the UI can understand.
Your controller now has no behavior; just static data - but it's got the right API for the UI, and now you know how the UI wants to use it.
Write an example that shows how the UI will use the controller in the most basic form.
Make the example work.
Write another example that shows how the controller behaves differently in a different context.
Make the example work.
Those are your unit tests! If you know that your controller is going to need some other classes to collaborate with, you can mock those out too.
Once your collaborators are mocked out, you already know how the controller wants to use them. Again, you have the API for those collaborators already, because the controller is using them.
This is what we're doing when we talk about "outside-in" in BDD.
I'm new to TDD too, and just like you I'm trying to learn. Here's what I've come up with during my searches, maybe it will help you too:
Check out Roy Osherove's website, and also his book "The Art of Unit Testing". Check out the videos, there are some great ones, especially the "Pair Programming" section. His book was the single best book that I've read about unit testing and TDD, and the only one that I've read from cover to cover.
Check out some TDD katas. There are some on the web page I've suggested in the previous item. Check out how other people are solving the katas. It's really helpful.
Read about dependency injection.
If you want to TDD in WinForms, check out the MVP pattern. As far as I know, it's the de facto patten for separating UI from business code in WinForms.
Good luck with your search.
The controller is a good starting point. Extract the View public api to an interface an test the interaction of the controller with that interface using a Mocking Framework. You can do the same for the service layer too.
Also, I would take the bottom-up approach for this application and unit test the lower level layers before adding tests to the UI layer. On the UI layer I will write a set of Acceptance Tests using a BDD framework and use mocking frameworks to make those tests lightweight and to reduce the number of tests.
Good luck!
Unit testing and ASP.NET web applications are an ambiguous point in my group. More often than not, good testing practices fall through the cracks and web applications end up going live for several years with no tests.
The cause of this pain point generally revolves around the hassle of writing UI automation mid-development.
How do you or your organization integrate best TDD practices with web application development?
Unit testing will be achievable if you separate your layers appropriately. As Rob Cooper implied, don't put any logic in your WebForm other than logic to manage your presentation. All other stuff logic and persistence layers should be kept in separate classes and then you can test those individually.
To test the GUI some people like selenium. Others complain that is a pain to set up.
I layer out the application and at least unit test from the presenter/controller (whichever is your preference, mvc/mvp) to the data layer. That way I have good test coverage over most of the code that is written.
I have looked at FitNesse, Watin and Selenium as options to automate the UI testing but I haven't got around to using these on any projects yet, so we stick with human testing. FitNesse was the one I was leaning toward but I couldn't introduce this as well as introducing TDD (does that make me bad? I hope not!).
This is a good question, one that I will be subscribing too :)
I am still relatively new to web dev, and I too am looking at a lot of code that is largely untested.
For me, I keep the UI as light as possible (normally only a few lines of code) and test the crap out of everything else. At least I can then have some confidence that everything that makes it to the UI is as correct as it can be.
Is it perfect? Perhaps not, but at least it as still quite highly automated and the core code (where most of the "magic" happens) still has pretty good coverage..
I would generally avoid testing that involves relying on UI elements. I favor integration testing, which tests everything from your database layer up to the view layer (but not the actual layout).
Try to start a test suite before writing a line of actual code in a new project, since it's harder to write tests later.
Choose carefully what you test - don't mindlessly write tests for everything. Sometimes it's a boring task, so don't make it harder. If you write too many tests, you risk abandoning that task under the weight of time-consuming maintenance.
Try to bundle as much functionality as possible into a single test. That way, if something goes wrong, the errors will propagate anyway. For example, if you have a digest-generating class - test the actual output, not every single helper function.
Don't trust yourself. Assume that you will always make mistakes, and so you write tests to make your life easier, not harder.
If you are not feeling good about writing tests, you are probably doing it wrong ;)
A common practice is to move all the code you can out of the codebehind and into an object you can test in isolation. Such code will usually follow the MVP or MVC design patterns. If you search on "Rhino Igloo" you will probably find the link to its Subversion repository. That code is worth a study, as it demonstrate one of the best MVP implementations on Web Forms that I have seen.
Your codebehind will, when following this pattern, do two things:
Transit all user actions to the presenter.
Render data provided by the presenter.
Unit testing the presenter should be trivial.
Update: Rhino Igloo can be found here: https://svn.sourceforge.net/svnroot/rhino-tools/trunk/rhino-igloo/
There have been tries on getting Microsoft's free UI Automation (included in .NET Framework 3.0) to work with web applications (ASP.NET). A german company called Artiso happens to have written a blog entry that explains how to achieve that (link).
However, their blogpost also links an MSDN Webcasts that explains the UI Automation Framework with winforms and after I had a look at this, I noticed you need the AutomationId to get a reference to the respecting controls. However, in web applications, the controls do not have an AutomationId.
I asked Thomas Schissler (Artiso) about this and he explained that this was a major drawback on InternetExplorer. He referenced an older technology of Microsoft (MSAA) and was hoping himself that IE8 will do this better.
However, I was also giving Watin a try and it seems to work pretty well. I even liked Wax, which allows to implement simple testcases via Microsoft Excel worksheets.
Ivonna can unit test your views. I'd still recommend moving most of the code to other parts. However, some code just belongs there, like references to controls or control event handlers.