Re: Unit Testing in .Net
- From: Jacques Bosch <jfbosch@xxxxxxxxx>
- To: programmingblind@xxxxxxxxxxxxx
- Date: Tue, 15 Feb 2011 15:41:11 +0200
OK, the overload didn't show up it seems.
OK, unit testing is writing code to test your code. Test driven development
is writing the test code before you write the application code.
Say you have a Customer class in your application. There is a requirement to
add new functionality to the application to lock a customer down when their
payments or 2 months over due.
So you would first write a test, for the new functionality that doesn't
exist yet, run it to verify it breaks, then implement the application code
until your test passes.
Example:
[TestClass]
class TestCustomers
{
[TestMethod]
public void TestCustomerLockdown()
{
var customer = Repository.GetTestCustomer();
customer.Lockdown(""Really bad customer"");
Assert.IsTrue (customer.IsLockedDown);
Assert.AreEqual("Really bad customer", customer.LockdownReason);
}
}
You would use VS refactoring tools to generate the Lockdown() stub. At first
running the test will obviously fail. Then you go and implement the
Lockdown() method until your test passes.
The idea is that test should execute very quickly, you can make it a part of
the build step and you will get instant feedback on whether your code works
without always having to go and manually test it. Plus this obviously
results in a test bed for future regression testing and gives you confidence
for future refactoring.
It is a whole science, but that is a VERY brief start.
Jacques
On Tue, Feb 15, 2011 at 3:26 PM, RicksPlace <ofbgmail@xxxxxxxxx> wrote:
> OK, you mean there might be allot of functionallity and, or, vendors
> supplying Unit Testing software? I would guess that's what you mean. I just
> would like the 50,000 foot view rather than a comprehensive analysis of
> technicals. In other words, how do you use unit testing in say a Visual
> Studio VWD or VB.net Application as you develop it as opposed to using the
> syntax checker and built in test environment. Ya, just a quick overview is
> what I would like so I get a general concept of what it is and the process
> used.
> Thanks again:
> Rick USA
>
> ----- Original Message -----
> *From:* Jacques Bosch <jfbosch@xxxxxxxxx>
> *To:* programmingblind@xxxxxxxxxxxxx
> *Sent:* Tuesday, February 15, 2011 8:07 AM
> *Subject:* Re: Unit Testing in .Net
>
> Sit back, and wait for the approaching information overload! :)
>
>
> On Tue, Feb 15, 2011 at 3:01 PM, RicksPlace <ofbgmail@xxxxxxxxx> wrote:
>
>> Hi Guys: What is this Unit Testing all about? The way I always worked
>> was to develop a project in a modular fashon. I plan, design and then code
>> and test one module at a time so I know my modules are working before going
>> on to the next module. How is this diferent from Unit Testing? I see a bunch
>> of software out there for Unit Testing and it all sounds complicated but
>> perhaps I don't really understand, actually I really don't understand, what
>> it is all about.
>> Later and thanks:
>> Rick USA
>>
>> ----- Original Message -----
>> *From:* Jacques Bosch <jfbosch@xxxxxxxxx>
>> *To:* programmingblind@xxxxxxxxxxxxx
>> *Sent:* Tuesday, February 15, 2011 6:51 AM
>> *Subject:* Re: Unit Testing in .Net
>>
>> >measure twice, cut once.
>> And not the fingers either!
>>
>>
>> On Tue, Feb 15, 2011 at 1:43 PM, Kerneels Roos <kerneels@xxxxxxxxx>wrote:
>>
>>> Wise words from a wise man!
>>>
>>>
>>> On 2/15/2011 1:33 PM, Homme, James wrote:
>>>
>>>> Hi Kerneels,
>>>> I had a Wood Shop teacher who told me measure twice, cut once.
>>>>
>>>> Jim
>>>>
>>>> Jim Homme,
>>>> Usability Services,
>>>> Phone: 412-544-1810. Skype: jim.homme
>>>> Internal recipients, Read my accessibility blog. Discuss accessibility
>>>> here. Accessibility Wiki: Breaking news and accessibility advice
>>>>
>>>> -----Original Message-----
>>>> From: programmingblind-bounce@xxxxxxxxxxxxx [mailto:
>>>> programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Kerneels Roos
>>>> Sent: Tuesday, February 15, 2011 2:27 AM
>>>> To: programmingblind@xxxxxxxxxxxxx
>>>> Subject: Re: Unit Testing in .Net
>>>>
>>>> Hi Dave,
>>>>
>>>> The more I read about it and try it for myself the more I can see the
>>>> value of unit testing. it looks however like something you need to do
>>>> from day one of the coding of a project. It's very hard to come in
>>>> afterwards and add tests to code that is suspect. I'm very impressed
>>>> with NUnit, but the GUI runner I don't find very accessible
>>>> unfortunately. Most frameworks seem to have a command line runner also,
>>>> so one can do that.
>>>>
>>>> Apart from the May 2009 book "The Art of Unit Testing ", there's also a
>>>> seemingly seminal book on TDD from 2002 focussing on Java -- can't find
>>>> the details now unfortunately, the author is Ken Peck.
>>>>
>>>> What I do realise is that , for years now I've been coding and then
>>>> testing while TDD is the other way around. The code then test approach
>>>> is more of a cowboy coder / hacker style which sutes the creative, risk
>>>> taking right brainers :-). To shift to the test then code approach might
>>>> take some time and effort.
>>>>
>>>> Now that I think about it, TDD makes a lot of sense for VI or blind
>>>> folks. If used properly it can minimise the need for debuggers. Don't
>>>> know about you guys, but I don't particularly like using a debugger.
>>>>
>>>> Forgive the rambling.
>>>>
>>>> Kerneels
>>>>
>>>> On 2/14/2011 6:00 AM, Dave wrote:
>>>>
>>>>> With that said, lots of people don't follow TDD or some variant
>>>>> because it does take a lot more time. You also have to consider that
>>>>> test code usually piles up *very* quickly. You could have a few
>>>>> hundred lines of code and to thoroughly test it (i.e. if you used TDD,
>>>>> or if you measure code coverage), you'll need triple that in test code
>>>>> or more. Once you make any changes in the production code, you end up
>>>>> spending lots of time making changes to the pile of test code.
>>>>>
>>>>> Not to say that you shouldn't test thoroughly, but lots don't
>>>>> (especially to the degree they should) for some valid reasons. If you
>>>>> can pull it off, it certainly will give your users less headaches when
>>>>> trying to use your products. It's one of those "open ended" problems;
>>>>> there's reasonable points to stop writing tests, but never a "end" as
>>>>> there's always some other condition you could try for an sufficiently
>>>>> complex piece of software.
>>>>>
>>>>> You also don't want to go down the road of testing user interface
>>>>> components as it requires hooking deeply into OS level events (most
>>>>> ironically, accessibility is useful here).
>>>>>
>>>>>
>>>>> On 2/13/11, Kerneels Roos<kerneels@xxxxxxxxx> wrote:
>>>>>
>>>>>> Thanks Dave,
>>>>>>
>>>>>> It is not so nice to come in afterwards and write tests for classes,
>>>>>> which I'm doing now to ensure everything works right, but I can
>>>>>> imagine
>>>>>> a TDD approach could work very well indeed. As I understand it, TDD is
>>>>>> also core to XP (extreme programming).
>>>>>>
>>>>>> For anything new I'm going to write tests before coding and also look
>>>>>> into TDD more formally. Once you know how to code and design
>>>>>> algorithms
>>>>>> one should invest in some solid software engineering techniques and
>>>>>> get
>>>>>> a good methodology to follow. I strongly believe it will save tons of
>>>>>> time and produce far better software if the project is anything larger
>>>>>> than a simple CRUD system.
>>>>>>
>>>>>> I can't decide if the book "The Art of Unit Testing" is worth the $24
>>>>>> or
>>>>>> not though :-)
>>>>>>
>>>>>> Regards
>>>>>>
>>>>>> On 2/13/2011 8:55 AM, Dave wrote:
>>>>>>
>>>>>>> The general approach advocated by some is that of Test Driven
>>>>>>> Development.
>>>>>>>
>>>>>>> I have to say that whatever I've written using this approach has been
>>>>>>> far more robust when it comes to quality.
>>>>>>>
>>>>>>> The .Net unit test frameworks of which NUnit is only one, all have
>>>>>>> lots in common. Visual Studio comes with a unit test framework as
>>>>>>> well and integrates the running of tests within VS itself. The
>>>>>>> actual
>>>>>>> tool chosen is a personal choice -- if you like integration with VS
>>>>>>> for example or something independent. What tool's UI do you like,
>>>>>>> etc.
>>>>>>>
>>>>>>> Basically, they all use .Net attributes to "markup" methods and
>>>>>>> classes with metadata; think test name, test description, run time,
>>>>>>> category, etc. Then, at runtime, the runner just via reflection
>>>>>>> grabs
>>>>>>> all of the tests and invokes them programmatically.
>>>>>>>
>>>>>>> As for TDD, if you're not familiar with it, I'd recommend looking it
>>>>>>> up. Essentially, you write tests before actually even implementing
>>>>>>> anything. The tests serve as a statement of what you expect to be
>>>>>>> true. This obviously requires that you iron out what your class
>>>>>>> interface should look like; this might not be the style you're used
>>>>>>> to
>>>>>>> and something C++ developers are more acustomed to.
>>>>>>>
>>>>>>> However, as you go along, you already have a set of validation tests
>>>>>>> that verify that your stuff actually works without doing the tedious
>>>>>>> pattern of compile, run, manually check if it works, and
>>>>>>> rinse/repeat.
>>>>>>>
>>>>>>> On 2/11/11, Jacques Bosch<jfbosch@xxxxxxxxx> wrote:
>>>>>>>
>>>>>>>> I've had good success with NUnit.
>>>>>>>>
>>>>>>>> On Fri, Feb 11, 2011 at 10:25 AM, Kerneels Roos<kerneels@xxxxxxxxx>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>> Hi, I've investigated NUnit and it'the GUI is quite accessible with
>>>>>>>>> JFW.
>>>>>>>>> Also interested in MBUnit / Galeo but haven't tested the GUI yet.
>>>>>>>>> Unit
>>>>>>>>> testing seems like a brilliant way to develop better code and keep
>>>>>>>>> it
>>>>>>>>> working while changing things.
>>>>>>>>>
>>>>>>>>> Advantage of NUnit is that the syntax is XUnit compatible, so what
>>>>>>>>> you
>>>>>>>>> learn there directly applies to a host of other unit test
>>>>>>>>> frameworks and
>>>>>>>>> languages. The more advanced Galeo / MBUnit is also XUnit
>>>>>>>>> compatible
>>>>>>>>> should
>>>>>>>>> you need more power later on.
>>>>>>>>> Could anyone recommend a good book on this topic / some comments of
>>>>>>>>> your
>>>>>>>>> own experience? I hope unit testing isn't just an accademic ideal
>>>>>>>>> but
>>>>>>>>> actually something that can be done economically.
>>>>>>>>>
>>>>>>>>> I found this e-book (PDF, epub and mobiM):
>>>>>>>>> http://www.manning.com/osherove/
>>>>>>>>> but it's from 2009 and doesn't seem to cover Galeo.
>>>>>>>>>
>>>>>>>>> Any comments most welcome!
>>>>>>>>>
>>>>>>>>> Regards,
>>>>>>>>> Kerneels
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> Kerneels Roos
>>>>>>>>> Cell: +27 (0)82 309 1998
>>>>>>>>> Skype: cornelis.roos
>>>>>>>>>
>>>>>>>>> "There are only two kinds of programming languages in the world;
>>>>>>>>> those
>>>>>>>>> everyone complains about, and those nobody uses."
>>>>>>>>>
>>>>>>>>> __________
>>>>>>>>> View the list's information and change your settings at
>>>>>>>>> //www.freelists.org/list/programmingblind
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>
>>>>>>>> Jacques Bosch
>>>>>>>>
>>>>>>>> Software Architecture and Development
>>>>>>>> Independent Contractor
>>>>>>>> Cell: +27 824711807 Fax: +27 86 504 4726
>>>>>>>> E-Mail: jfbosch@xxxxxxxxx
>>>>>>>>
>>>>>>>> __________
>>>>>>> View the list's information and change your settings at
>>>>>>> //www.freelists.org/list/programmingblind
>>>>>>>
>>>>>>> --
>>>>>> Kerneels Roos
>>>>>> Cell: +27 (0)82 309 1998
>>>>>> Skype: cornelis.roos
>>>>>>
>>>>>> "There are only two kinds of programming languages in the world; those
>>>>>> everyone complains about, and those nobody uses."
>>>>>>
>>>>>> __________
>>>>>> View the list's information and change your settings at
>>>>>> //www.freelists.org/list/programmingblind
>>>>>>
>>>>>>
>>>>>> __________
>>>>> View the list's information and change your settings at
>>>>> //www.freelists.org/list/programmingblind
>>>>>
>>>>> --
>>>> Kerneels Roos
>>>> Cell: +27 (0)82 309 1998
>>>> Skype: cornelis.roos
>>>>
>>>> "There are only two kinds of programming languages in the world; those
>>>> everyone complains about, and those nobody uses."
>>>>
>>>> __________
>>>> View the list's information and change your settings at
>>>> //www.freelists.org/list/programmingblind
>>>>
>>>>
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>>>>
>>> --
>>> Kerneels Roos
>>> Cell: +27 (0)82 309 1998
>>> Skype: cornelis.roos
>>>
>>> "There are only two kinds of programming languages in the world; those
>>> everyone complains about, and those nobody uses."
>>>
>>> __________
>>> View the list's information and change your settings at
>>> //www.freelists.org/list/programmingblind
>>>
>>>
>>
>>
>> --
>>
>> Jacques Bosch
>>
>> Software Architecture and Development
>> Independent Contractor
>> Cell: +27 824711807 Fax: +27 86 504 4726
>> E-Mail: jfbosch@xxxxxxxxx
>>
>>
>
>
> --
>
> Jacques Bosch
>
> Software Architecture and Development
> Independent Contractor
> Cell: +27 824711807 Fax: +27 86 504 4726
> E-Mail: jfbosch@xxxxxxxxx
>
>
--
Jacques Bosch
Software Architecture and Development
Independent Contractor
Cell: +27 824711807 Fax: +27 86 504 4726
E-Mail: jfbosch@xxxxxxxxx
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