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  • Implementing unit testing at a company that doesn't do it

    - by Pete
    My company's head of software development just "resigned" (i.e. fired) and we are now looking into improving the development practices at our company. We want to implement unit testing in all software created from here on out. Feedback from the developers is this: We know testing is valuable But, you are always changing the specs so it'd be a waste of time And, your deadlines are so tight we don't have enough time to test anyway Feedback from the CEO is this: I would like our company to have automated testing, but I don't know how to make it happen We don't have time to write large specification documents How do developers get the specs now? Word of mouth or PowerPoint slide. Obviously, that's a big problem. My suggestion is this: Let's also give the developers a set of test data and unit tests That's the spec. It's up to management to be clear and quantitative about what it wants. The developers can put it whatever other functionality they feel is needed and it need not be covered by tests Well, if you've ever been in a company that was in this situation, how did you solve the problem? Does this approach seem reasonable?

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  • What should be tested in Javascript?

    - by Nathan Hoad
    At work, we've just started on a heavily Javascript based application (actually using Coffeescript, but still), of which I've been implementing an automated test system using JsTestDriver and fabric. We've never written something with this much Javascript, so up until now we've never done any Javascript testing. I'm unsure what exactly we should be testing in our unit tests. We've written JQuery plugins for various things, so it's quite obvious that they should be verified for correctness as much as possible with JsTestDriver, but everyone else in my team seems to think that we should be testing the page level Javascript as well. I don't think we should be testing page level Javascript as unit tests, but instead using a system like Selenium to verify everything works as expected. My main reasoning for this is that at the moment, page level Javascript tests are guaranteed to fail through JsTestDriver, because they're trying to access elements on the DOM that can't possibly exist. So, what should be unit tested in Javascript?

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  • UI Testing with Visual Studio 2010 Feature Pack 2

    - by Seth P.
    One of the most intriguing items in the recently released Visual Studio 2010 Feature Pack 2 is the ability to create and edit UI tests in Silverlight. Here is an example of a coded UI test. I haven't had much time to use it yet, but for people who have, I am curious as to what your thoughts are. Is this something you have found to be particularly useful? I would like to be able to automate a significant amount of regression testing that we are currently performing manually. In your experience, has it made a major impact on the resources that you would normally have to dedicate to testing? Thanks, Seth

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  • Beta Testing iOS Application

    - by dbramhall
    I was wondering if it is advisable to get a small team of beta testers for an iOS application that will be released to the App Store. I am developing an iOS application and I have setup a beta application form however I was wondering if it is advisable to even do beta testing considering I am actively testing and using my application on all of my own iOS devices (iPad 2, 2 iPod Touches and an iPhone 4 (plus, of course iOS Simulator)) - all running various versions of iOS 4. My question is: would you advise someone to get beta testers for an iOS application and, if so, how would you advise them to go about getting testers. For those interested, my application is at http://affogato.visioa.com/

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  • GA UA codes for testing site - set up

    - by Drew
    Anyone know the process for using a GA live UA code to test a site in development. I.e. I have a live site with a GA UA code attached, tracking live traffic data etc e.g. UA-123456. I've been told that there is a way to produce another code associated to the primary code to use on the testing version of my live site e.g. test code could be UA-123457. Can anyone shed some light on this? If not possible should I just set up a completely separate GA account for my testing site?

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  • How important are unit tests in software development?

    - by Lo Wai Lun
    We are doing software testing by testing a lot of I/O cases, so developers and system analysts can open reviews and test for their committed code within a given time period (e.g. 1 week). But when it come across with extracting information from a database, how to consider the cases and the corresponding methodology to start with? Although that is more likely to be a case studies because the unit-testing depends on the project we have involved which is too specific and particular most of the time. What is the general overview of the steps and precautions for unit-testing?

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  • Pair programming and unit testing

    - by TheSilverBullet
    My team follows the Scrum development cycle. We have received feedback that our unit testing coverage is not very good. A team member is suggesting the addition of an external testing team to assist the core team, but I feel this will backfire in a bad way. I am thinking of suggesting pair programming approach. I have a feeling that this should help the code be more "test-worthy" and soon the team can move to test driven development! What are the potential problems that might arise out of pair programming??

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  • Continuous integration testing server: hosted, own desktop, or own server

    - by Victor
    For testing, I am planning to run a continuous integration testing. There are mainly two options: hosted, or own desktop/server. I will break it into 3 options I have: Hosted: Economical, $10-20/month for a small app Less setup, the CI company manage all hardware and software Desktop: I could just buy a simple, cheap desktop as a test server (about $500). Used server: My current office is offloading some old Dell rack server (Probably dual core Xeon, which I can purchase for $50 or less Please advise me which best serves me for a small team of 2-3 developers. Thanks.

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  • How important is the unit test in the software development?

    - by Lo Wai Lun
    We are doing software testing by testing a lot if I/O cases, so developers and system analysts can open reviews and test for their committed code within a given time period (e.g. 1 week). But when it come across with extracting information from a database, how to consider the cases and the corresponding methodology to start with? Although that is more likely to be a case studies because the unit-testing depends on the project we have involved which is too specific and particular most of the time. What is the general overview of the steps and precautions for unit-testing?

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  • Unit testing a text index

    - by jplot
    Consider a text index such as a suffix tree or a suffix array supporting Count queries (number of occurrences of a pattern) and Locate queries (the positions of all the occurrences of a pattern) over a given text. How would you go about unit testing such a class ? What I have in mind is to generate a big random string then extract a random substring from this big string and compare the results of both queries with naive implementations (such as string::find). Another idea I have is to find the most frequent substring of length l appearing in the original string (using perhaps a naive method) and use these substrings for testing the index. This isn't the best way, so what would be a good design of the unit tests for a text index ? In case it matters, this is in C++ using google test.

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  • Model Based Testing Strategies

    - by Doubt
    What strategies have you used with Model Based Testing? Do you use it exclusively for integration testing, or branch it out to other areas (unit/functional/system/spec verification)? Do you build focused "sealed" models or do you evolve complex onibus models over time? When in the product cycle do you invest in creating MBTs? What sort of base test libraries do you exclusively create for MBTs? What difference do you make in your functional base test libraries to better support MBTs?

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  • Entity Framework 4.0 Unit Testing

    - by Steve Ward
    Hi, I've implemented unit testing along the lines of this article with a fake object context and IObjectSet with POCO in EF4. http://blogs.msdn.com/adonet/archive/2009/12/17/test-driven-development-walkthrough-with-the-entity-framework-4-0.aspx But I'm unsure how to implement a couple of methods on my fake object context for testing. I have CreateQuery and ExecuteFunction methods on my object context interface so that I can execute ESQL and Stored Procedures but I cant (easily) implement them in my fake object context. An alternative would be to use a test double of my repository instead of a double of my object context as suggested here: http://social.msdn.microsoft.com/Forums/en-US/adonetefx/thread/c4921443-e8a3-4414-92dd-eba1480a07ad/ But this would mean my real repository isnt being tested and would seem to just bypass the issue. Can anyone offer any recommendations?

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  • Final Integration Testing for Q.A.

    - by CalebHC
    A medium sized rails app that our company has been working on is getting close to the end of development and we are going to start doing Q.A. testing on it. We've have been writing unit, functional and integration tests all along and our test coverage is about 99% (even though that really doesn't mean anything). We feel like we have a pretty good test suite but I was wondering if we should be writing final integration tests for every little action we are going to do during our Q.A. process. If so, would using Shoulda or Cucumber be a good idea? We haven't used either of those testing tools yet, but they sound really great. Any ideas or thoughts would be really helpful. Thanks

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  • Testing Web Application: "Mirror" ad-hoc testing in another window

    - by Narcissus
    I don't even really know if the title is the best way to explain what I'm trying to do, but anyway... We have a web app that is being ported to a number of DB backends via MDB2. Our unit tests are pretty lacking at the moment, but our internal users are pretty good at knowing what to test to see if things are broken. What I'm 'imagining' is a browser plug in (don't really care which browser it is for) or a similar system that essentially takes every event from one window and 'mirrors' it in the other browser/s. The reason I'd like this is so that I can have various installations that use different DB backends, and have the user open a window/tab to each installation. From there, however, I'd like them to be able to 'work' in one window and have that 'work' I occur at the same time in each of the 'cloned' windows. From there, they should be able to do some quick eyeballing of the information that comes back, without having to worry about timing differences and so (very much). I know it's a big ask, but I figure if anyone knows of a solution, I'd find it here... Any thoughts?

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  • Automating XNA Performance Testing?

    - by Grofit
    I was wondering what peoples approaches or thoughts were on automating performance testing in XNA. Currently I am looking at only working in 2d, but that poses many areas where performance can be improved with different implementations. An example would be if you had 2 different implementations of spatial partitioning, one may be faster than another but without doing some actual performance testing you wouldn't be able to tell which one for sure (unless you saw the code was blatantly slow in certain parts). You could write a unit test which for a given time frame kept adding/updating/removing entities for both implementations and see how many were made in each timeframe and the higher one would be the faster one (in this given example). Another higher level example would be if you wanted to see how many entities you can have on the screen roughly without going beneath 60fps. The problem with this is to automate it you would need to use the hidden form trick or some other thing to kick off a mock game and purely test which parts you care about and disable everything else. I know that this isnt a simple affair really as even if you can automate the tests, really it is up to a human to interpret if the results are performant enough, but as part of a build step you could have it run these tests and publish the results somewhere for comparison. This way if you go from version 1.1 to 1.2 but have changed a few underlying algorithms you may notice that generally the performance score would have gone up, meaning you have improved your overall performance of the application, and then from 1.2 to 1.3 you may notice that you have then dropped overall performance a bit. So has anyone automated this sort of thing in their projects, and if so how do you measure your performance comparisons at a high level and what frameworks do you use to test? As providing you have written your code so its testable/mockable for most parts you can just use your tests as a mechanism for getting some performance results... === Edit === Just for clarity, I am more interested in the best way to make use of automated tests within XNA to track your performance, not play testing or guessing by manually running your game on a machine. This is completely different to seeing if your game is playable on X hardware, it is more about tracking the change in performance as your game engine/framework changes. As mentioned in one of the comments you could easily test "how many nodes can I insert/remove/update within QuadTreeA within 2 seconds", but you have to physically look at these results every time to see if it has changed, which may be fine and is still better than just relying on playing it to see if you notice any difference between version. However if you were to put an Assert in to notify you of a fail if it goes lower than lets say 5000 in 2 seconds you have a brittle test as it is then contextual to the hardware, not just the implementation. Although that being said these sort of automated tests are only really any use if you are running your tests as some sort of build pipeline i.e: Checkout - Run Unit Tests - Run Integration Tests - Run Performance Tests - Package So then you can easily compare the stats from one build to another on the CI server as a report of some sort, and again this may not mean much to anyone if you are not used to Continuous Integration. The main crux of this question is to see how people manage this between builds and how they find it best to report upon. As I said it can be subjective but as knowledge will be gained from the answers it seems a worthwhile question.

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  • How can I justify software testing to management?

    - by Nate
    I work for a small company (less than 200 employees) whose software group only makes up a small part of our staff (4 employees, occasionally with a few contractors). The four of us have been making strides in transitioning to better practices, and one of the next logical steps is to improve our testing. As anyone who has done any meaningful tests knows, testing takes a lot of time - and at my company, it takes too much time to justify to management, so we generally do what little we do on the sly. I don't think this is serving us well, as we keep coming up against otherwise avoidable problems when we ship under-tested software. I would like to be able to come to management with a justification for hiring a dedicated software test engineer (someone who can both write automated tests and perform manual ones). Are there any good published studies that show the benefits of adding such a position to a small company? Where can I find information about costs associated with the position? I plan on doing a little number crunching on our own history, but having some external sources to point to would help bolster my case.

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  • Why is testing MVC Views frowned upon?

    - by Peter Bernier
    I'm currently setting the groundwork for an ASP.Net MVC application and I'm looking into what sort of unit-tests I should be prepared to write. I've seen in multiple places people essentially saying 'don't bother testing your views, there's no logic and it's trivial and will be covered by an integration test'. I don't understand how this has become the accepted wisdom. Integration tests serve an entirely different purpose than unit tests. If I break something, I don't want to know a half-hour later when my integration tests break, I want to know immediately. Sample Scenario : Lets say we're dealing with a standard CRUD app with a Customer entity. The customer has a name and an address. At each level of testing, I want to verify that the Customer retrieval logic gets both the name and the address properly. To unit-test the repository, I write an integration test to hit the database. To unit-test the business rules, I mock out the repository, feed the business rules appropriate data, and verify my expected results are returned. What I'd like to do : To unit-test the UI, I mock out the business rules, setup my expected customer instance, render the view, and verify that the view contains the appropriate values for the instance I specified. What I'm stuck doing : To unit-test the repository, I write an integration test, setup an appropriate login, create the required data in the database, open a browser, navigate to the customer, and verify the resulting page contains the appropriate values for the instance I specified. I realize that there is overlap between the two scenarios discussed above, but the key difference it time and effort required to setup and execute the tests. If I (or another dev) removes the address field from the view, I don't want to wait for the integration test to discover this. I want is discovered and flagged in a unit-test that gets multiple times daily. I get the feeling that I'm just not grasping some key concept. Can someone explain why wanting immediate test feedback on the validity of an MVC view is a bad thing? (or if not bad, then not the expected way to get said feedback)

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  • Automated testing tool development challenges (for embedded software)

    - by Karthi prime
    My boss want to come up with the proposal for the following tool: An IDE: Able to build, compile, debug, via JTAG programming for the micro-controller. A Test Suite, reads the code in the IDE, auto generates the test cases, and it gives the in-target unit testing results(which is done by controlling code execution in the micro-controller via IDE). A no-overhead code coverage tool which interacts with the test suite and IDE. My work is to obtain the high level architecture of this tool, so as to proceed further. My current knowledge: There are tool-chains available from the chip manufacturer for the micro-controllers which can be utilized along with an open-source IDE like Eclipse, and along with an open-source burner, a complete IDE for a micro-controller can be done. Test cases can be auto-generated by reading the source file through the process of parsing, scripting, based on keywords. Test suite must be able to command the IDE to control, through breakpoints, and read the register contents from the microcontroller - This enables the in-target unit testing. An no-overhead code coverage should be done by no-overhead code instrumentation so as to execute those in the resource constraint environment of the micro-controller. I have the following questions: Any advice on the validity of my understanding? What are the challenges I will have during the development? What are the helpful open-source tools regarding this? What is the development time for this software? Thanks

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  • Automated Qt testing framework

    - by user1457565
    Can someone recommend a good robust "Free" testing framework for Qt? Our requirements: Should be able to test basic mouse click / mouse move events SHould be able to handle non-widget view components Should have "record" capability to generate test scripts. Should be automatable for running it daily. We looked at: Squish - this solves all our problems. But it is just too da** expensive. KD Executor - the download page now links to the squish page and says thats what they recommend for testing. Not sure what they mean by that. TDriver - from nokia.qt. Super difficult to install. Very little documentation. Having a hard time to just install. I wonder how much harder it would be to write tests. qtestlib - Could not handle non-widget components. Everything has to be a widget to be tested. No "record" feature. Can someone help with any other alternative ? thanks Mouli

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  • Modifying a HTML page to fix several "bugs" add a function to next/previous on a option dropdown

    - by Dennis Sylvian
    SOF, I've got a few problems plaguing me at the moment and am wondering if anyone could assist me with them. I'm trying to get Next Class | Previous Class to act as buttons so that when Next Class is clicked it will go to the next item in the dropdown list and for previous it would go to back one. There used to be a scroll bar that allowed me to scroll the main window left and right, it's missing because (I think it was to do with the scroll left and scroll right function) The footer at the bottom doesn't show correctly on mobile devices; for some reason it appears completely differently to as it does on a computer. The "bar" practically and the Scroll Left and Scroll buttons don't appear at all on mobile devices. The scroll left button is unable to be clicked for some reason, I'm unsure what I've done wrong. Refreshing the page resets the horizontal scroll position to far left (I'm pretty sure this relates to the scroll bar) I want to also find a way so that on mobile devices the the header will not show the placeholder image, however I can't work out what CSS media tag(s) I should be using. Latest: http://jsfiddle.net/pwv7u/ Smaller HTML <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>DATA DATA DATA DATA DATA DATA DATA DATA</title> <style type="text/css"> <!-- @import url("nstyle.css"); --> </style> <script src="jquery.min.js" type="text/javascript"></script> <script type="text/javascript"> $(document).ready( function() { for (var i=0;i<($("table").children().length);i++){ if(readCookie(i)) $($($("table").children()[i]).children()[(readCookie(i))]).toggleClass('selected').siblings().removeClass('selected'); } $("tr").click(function(){ $(this).toggleClass('selected').siblings().removeClass('selected'); if(readCookie($(this).parent().index())){ if(readCookie($(this).parent().index())==$(this).index()) eraseCookie($(this).parent().index()); else{ eraseCookie($(this).parent().index()); createCookie($(this).parent().index(),$(this).index(),1); } } else createCookie($(this).parent().index(),$(this).index(),1); }); // gather CLASS info var selector = $('.class-selector').on('change', function(){ var id = this.value; if (id!==''){ scrollToAnchor(id); } }); $('a[id^="CLASS"]').each(function(){ var id = this.id, option = $('<option>',{ value: this.id, text:this.id }); selector.append(option); }); function scrollToAnchor(aid) { var aTag = $("a[id='" + aid + "']"); $('html,body').animate({ scrollTop: aTag.offset().top - 80 }, 1); } $("a.TOPJS").click(function () { scrollToAnchor('TOP'); }); $("a.KEYJS").click(function () { scrollToAnchor('KEY'); }); $("a.def").click(function () { $('#container').animate({ "scrollLeft": "-=204" }, 200); }); $("a.abc").click(function () { $("#container").animate({ "scrollLeft": "+=204" }, 200); }); function createCookie(name,value,days) { var expires; if (days) { var date = new Date(); date.setMilliseconds(0); date.setSeconds(0); date.setMinutes(0); date.setHours(0); date.setDate(date.getDate()+days); expires = "; expires="+date.toGMTString(); } else expires = ""; document.cookie = name+"="+value+expires+"; path=/"; } function readCookie(name) { var nameEQ = name + "="; var ca = document.cookie.split(';'); for(var i=0;i < ca.length;i++) { var c = ca[i]; while (c.charAt(0)==' ') c = c.substring(1,c.length); if (c.indexOf(nameEQ) === 0) return c.substring(nameEQ.length,c.length); } return null; } function eraseCookie(name) { createCookie(name,"",-1); } }); </script> </head> <body> <div id="header_container"> <div id="header"> <a href="http://site.x/" target="_blank"><img src="http://placehold.it/300x80"></a> <select class="class-selector"> <option value="">-select class-</option> </select> <div class="classcycler"> <a href="#TOP"><font color=#EFEFEF>Next Class</font></a> <font color=red>|</font> <a href="#TOP"><font color=#EFEFEF>Previous Class</font></a> </div> <div id="header1"> Semi-Transparent Image <a href="#TOP"><font color=#EFEFEF>Up to Top</font></a> | <a href="#KEY"><font color=#EFEFEF>Down to Key</font></a> </div> </div> </div> <a id="TOP"></a> <div id="container"> <table id="gradient-style"> <tbody> <thead> <tr> <th scope="col"><a id="CLASS1"></a>Class 1</th> <th scope="col">Class 1</th> <th scope="col">Class 1</th> <th scope="col">Class<br>Test 1</th> <th scope="col">Class 1</th> <th scope="col">Class 1</th> <th scope="col">Class 1</th> <th scope="col">Class Data 1</th> <th scope="col">Class 1<br>Class 1</th> <th scope="col">Class 1</th> <th scope="col">Class 1<br>Class 1</th> <th scope="col">Class 1</th> <th scope="col">Class 1</th> <th scope="col">Class 1</th> <th scope="col">Class 1</th> <th scope="col">Class 1</th> <th scope="col">Class 1 Class 1</th> <th scope="col">title text<br> data text</th> <th scope="col">title text<br> data text</th> <th scope="col">title text</th> <th scope="col">title text<br> data text</th> <th scope="col">title text<br> data text</th> <th scope="col">title text<br> data text</th> <th scope="col">title text</th> <th scope="col">title text<br> data text</th> <th scope="col">title text<br> data text</th> <th scope="col">title text<br> data text</th> <th scope="col">title text<br> data text</th> <th scope="col">title text<br> (data text)</th> <th scope="col">title text</th> <th scope="col">text</th> <th scope="col">text</th> <th scope="col">title text</th> <th scope="col">title text</th> </tr> </thead> <tr class="ft3"><td>testing data</td><td>testing data</td><td>test</td><td>class b</td><td>test4</td><td><div align="left">data</div></td><td><div align="left"> </div></td><td><div align="left"></div></td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>test</td><td>test</td><td>test</td><td>test</td><td>testing data</td><td>test</td><td>testing data</td><td>testing data</td><td>testing data</td><td>test</td><td>test</td><td>testing data</td><td>testing data</td><td>testing data</td><td>test</td><td>testing data</td><td>test</td><td>testing data</td><td>test</td><td>test</td><td>testing data</td><td>testing data</td><tr> <tr class="f3"><td>test</td><td>test</td><td>test</td><td>class a</td><td>test2</td><td><div align="left"> </div></td><td><div align="left"></div></td><td><div align="left"></div></td><td>testing data</td><td>test</td><td>test</td><td>test</td><td>testing data</td><td>testing data</td><td>test</td><td>testing data</td><td>test</td><td>testing data</td><td>testing data</td><td>test</td><td>testing data</td><td>testing data</td><td>test</td><td>testing data</td><td>testing data</td><td>testing data</td><td>test</td><td>testing data</td><td>test</td><td>test</td><td>test</td><td>test</td><td>testing data</td><td>test</td><tr> <thead> <tr> <th scope="col"><a id="CLASS2"></a>Class 2</th> <th scope="col">Class 2</th> <th scope="col">Class 2</th> <th scope="col">Class<br>Test 2</th> <th scope="col">Class 2</th> <th scope="col">Class 2</th> <th scope="col">Class 2</th> <th scope="col">Class Data 2</th> <th scope="col">Class 2<br>Class 2</th> <th scope="col">Class 2</th> <th scope="col">Class 2<br>Class 2</th> <th scope="col">Class 2</th> <th scope="col">Class 2</th> <th scope="col">Class 2</th> <th scope="col">Class 2</th> <th scope="col">Class 2</th> <th scope="col">Class 2 Class 2</th> <th scope="col">title text<br> data text</th> <th scope="col">title text<br> data text</th> <th scope="col">title text</th> <th scope="col">title text<br> data text</th> <th scope="col">title text<br> data text</th> <th scope="col">title text<br> data text</th> <th scope="col">title text</th> <th scope="col">title text<br> data text</th> <th scope="col">title text<br> data text</th> <th scope="col">title text<br> data text</th> <th scope="col">title text<br> data text</th> <th scope="col">title text<br> (data text)</th> <th scope="col">title text</th> <th scope="col">text</th> <th scope="col">text</th> <th scope="col">title text</th> <th scope="col">title text</th> </tr> </thead> <tr class="ft3"><td>testing data</td><td>testing data</td><td>test</td><td>class f</td><td>test2</td><td><div align="left">data</div></td><td><div align="left"></div></td><td><div align="left">data</div></td><td>test</td><td>test</td><td>testing data</td><td>test</td><td>test</td><td>test</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>test</td><td>testing data</td><td>test</td><td>test</td><td>test</td><td>testing data</td><td>testing data</td><td>test</td><td>test</td><td>test</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><tr> <tr><td>test</td><td>testing data</td><td>test</td><td>class f</td><td>test4</td><td><div align="left">data</div></td><td><div align="left"></div></td><td><div align="left"></div></td><td>testing data</td><td>test</td><td>test</td><td>test</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>test</td><td>test</td><td>test</td><td>test</td><td>test</td><td>testing data</td><td>test</td><td>testing data</td><td>testing data</td><td>test</td><td>test</td><td>test</td><td>testing data</td><td>test</td><td>testing data</td><td>testing data</td><td>testing data</td><tr> <tr class="f3"><td>test</td><td>testing data</td><td>testing data</td><td>class d</td><td>test5</td><td><div align="left">data</div></td><td><div align="left"> </div></td><td><div align="left">data</div></td><td>test</td><td>test</td><td>test</td><td>test</td><td>test</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>test</td><td>test</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>test</td><td>test</td><td>testing data</td><td>testing data</td><td>testing data</td><tr> <tr><td>testing data</td><td>test</td><td>test</td><td>class f</td><td>test5</td><td><div align="left"></div></td><td><div align="left"></div></td><td><div align="left">data</div></td><td>testing data</td><td>test</td><td>testing data</td><td>testing data</td><td>test</td><td>test</td><td>testing data</td><td>test</td><td>test</td><td>testing data</td><td>testing data</td><td>test</td><td>test</td><td>testing data</td><td>test</td><td>test</td><td>test</td><td>test</td><td>testing data</td><td>testing data</td><td>testing data</td><td>test</td><td>test</td><td>testing data</td><td>test</td><td>testing data</td><tr> <tr class="f2"><td>test</td><td>test</td><td>testing data</td><td>class a</td><td>test1</td><td><div align="left">data</div></td><td><div align="left"> </div></td><td><div align="left">data</div></td><td>test</td><td>test</td><td>testing data</td><td>testing data</td><td>test</td><td>testing data</td><td>test</td><td>test</td><td>testing data</td><td>testing data</td><td>test</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>test</td><td>test</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>testing data</td><td>test</td><td>testing data</td><td>testing data</td><td>test</td><tr> </tbody> <tfoot> <tr> <th class="alt" colspan="34" scope="col"><a id="KEY"></a><img src="http://placehold.it/300x50"></th> </tr> <tr> <td colspan="34"><em><b>DATA DATA</b> - DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA </em></td> </tr> <tr> <td class="alt" colspan="34"><em><b>DAT DATA</b> - DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA DATA </em></td> </tr> </tfoot> </table> </div> 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background: #000000 url('table-images/gradhead.png') repeat-x; border: 0px solid #666; bottom: 0; height: 95px; left: 0; position: fixed; width: 100%; } #footer { position: relative; margin: 0 auto; height: 100%; text-align: center; color: #FFF; } #footer1 { position: absolute; width: 103%; top: 50px; } #footer2 { position: absolute; width: 110%; top: 70px; } #footer .footleft { top: 45px; left: 2%; position: absolute; font-size:20px; } #footer .footright { top: 45px; right: 2%; position: absolute; font-size:20px; }

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  • Code Contracts: Unit testing contracted code

    - by DigiMortal
    Code contracts and unit tests are not replacements for each other. They both have different purpose and different nature. It does not matter if you are using code contracts or not – you still have to write tests for your code. In this posting I will show you how to unit test code with contracts. In my previous posting about code contracts I showed how to avoid ContractExceptions that are defined in code contracts runtime and that are not accessible for us in design time. This was one step further to make my randomizer testable. In this posting I will complete the mission. Problems with current code This is my current code. public class Randomizer {     public static int GetRandomFromRangeContracted(int min, int max)     {         Contract.Requires<ArgumentOutOfRangeException>(             min < max,             "Min must be less than max"         );           Contract.Ensures(             Contract.Result<int>() >= min &&             Contract.Result<int>() <= max,             "Return value is out of range"         );           var rnd = new Random();         return rnd.Next(min, max);     } } As you can see this code has some problems: randomizer class is static and cannot be instantiated. We cannot move this class between components if we need to, GetRandomFromRangeContracted() is not fully testable because we cannot currently affect random number generator output and therefore we cannot test post-contract. Now let’s solve these problems. Making randomizer testable As a first thing I made Randomizer to be class that must be instantiated. This is simple thing to do. Now let’s solve the problem with Random class. To make Randomizer testable I define IRandomGenerator interface and RandomGenerator class. The public constructor of Randomizer accepts IRandomGenerator as argument. public interface IRandomGenerator {     int Next(int min, int max); }   public class RandomGenerator : IRandomGenerator {     private Random _random = new Random();       public int Next(int min, int max)     {         return _random.Next(min, max);     } } And here is our Randomizer after total make-over. public class Randomizer {     private IRandomGenerator _generator;       private Randomizer()     {         _generator = new RandomGenerator();     }       public Randomizer(IRandomGenerator generator)     {         _generator = generator;     }       public int GetRandomFromRangeContracted(int min, int max)     {         Contract.Requires<ArgumentOutOfRangeException>(             min < max,             "Min must be less than max"         );           Contract.Ensures(             Contract.Result<int>() >= min &&             Contract.Result<int>() <= max,             "Return value is out of range"         );           return _generator.Next(min, max);     } } It seems to be inconvenient to instantiate Randomizer now but you can always use DI/IoC containers and break compiled dependencies between the components of your system. Writing tests for randomizer IRandomGenerator solved problem with testing post-condition. Now it is time to write tests for Randomizer class. Writing tests for contracted code is not easy. The main problem is still ContractException that we are not able to access. Still it is the main exception we get as soon as contracts fail. Although pre-conditions are able to throw exceptions with type we want we cannot do much when post-conditions will fail. We have to use Contract.ContractFailed event and this event is called for every contract failure. This way we find ourselves in situation where supporting well input interface makes it impossible to support output interface well and vice versa. ContractFailed is nasty hack and it works pretty weird way. Although documentation sais that ContractFailed is good choice for testing contracts it is still pretty painful. As a last chance I got tests working almost normally when I wrapped them up. Can you remember similar solution from the times of Visual Studio 2008 unit tests? Cannot understand how Microsoft was able to mess up testing again. [TestClass] public class RandomizerTest {     private Mock<IRandomGenerator> _randomMock;     private Randomizer _randomizer;     private string _lastContractError;       public TestContext TestContext { get; set; }       public RandomizerTest()     {         Contract.ContractFailed += (sender, e) =>         {             e.SetHandled();             e.SetUnwind();               throw new Exception(e.FailureKind + ": " + e.Message);         };     }       [TestInitialize()]     public void RandomizerTestInitialize()     {         _randomMock = new Mock<IRandomGenerator>();         _randomizer = new Randomizer(_randomMock.Object);         _lastContractError = string.Empty;     }       #region InputInterfaceTests     [TestMethod]     [ExpectedException(typeof(Exception))]     public void GetRandomFromRangeContracted_should_throw_exception_when_min_is_not_less_than_max()     {         try         {             _randomizer.GetRandomFromRangeContracted(100, 10);         }         catch (Exception ex)         {             throw new Exception(string.Empty, ex);         }     }       [TestMethod]     [ExpectedException(typeof(Exception))]     public void GetRandomFromRangeContracted_should_throw_exception_when_min_is_equal_to_max()     {         try         {             _randomizer.GetRandomFromRangeContracted(10, 10);         }         catch (Exception ex)         {             throw new Exception(string.Empty, ex);         }     }       [TestMethod]     public void GetRandomFromRangeContracted_should_work_when_min_is_less_than_max()     {         int minValue = 10;         int maxValue = 100;         int returnValue = 50;           _randomMock.Setup(r => r.Next(minValue, maxValue))             .Returns(returnValue)             .Verifiable();           var result = _randomizer.GetRandomFromRangeContracted(minValue, maxValue);           _randomMock.Verify();         Assert.AreEqual<int>(returnValue, result);     }     #endregion       #region OutputInterfaceTests     [TestMethod]     [ExpectedException(typeof(Exception))]     public void GetRandomFromRangeContracted_should_throw_exception_when_return_value_is_less_than_min()     {         int minValue = 10;         int maxValue = 100;         int returnValue = 7;           _randomMock.Setup(r => r.Next(10, 100))             .Returns(returnValue)             .Verifiable();           try         {             _randomizer.GetRandomFromRangeContracted(minValue, maxValue);         }         catch (Exception ex)         {             throw new Exception(string.Empty, ex);         }           _randomMock.Verify();     }       [TestMethod]     [ExpectedException(typeof(Exception))]     public void GetRandomFromRangeContracted_should_throw_exception_when_return_value_is_more_than_max()     {         int minValue = 10;         int maxValue = 100;         int returnValue = 102;           _randomMock.Setup(r => r.Next(10, 100))             .Returns(returnValue)             .Verifiable();           try         {             _randomizer.GetRandomFromRangeContracted(minValue, maxValue);         }         catch (Exception ex)         {             throw new Exception(string.Empty, ex);         }           _randomMock.Verify();     }     #endregion        } Although these tests are pretty awful and contain hacks we are at least able now to make sure that our code works as expected. Here is the test list after running these tests. Conclusion Code contracts are very new stuff in Visual Studio world and as young technology it has some problems – like all other new bits and bytes in the world. As you saw then making our contracted code testable is easy only to the point when pre-conditions are considered. When we start dealing with post-conditions we will end up with hacked tests. I hope that future versions of code contracts will solve error handling issues the way that testing of contracted code will be easier than it is right now.

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