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Google Testing Blog: Shyam Seshadri

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var a = axel * 10000000000000; document.write('<iframe src="https://2542116.fls.doubleclick.net/activityi;src=2542116;type=gblog;cat=googl0;ord=ord=' + a + '?" width="1" height="1" frameborder="0" style="display:none"></iframe>'); //]]> </script> <noscript> <img alt='' height='1' src='https://ad.doubleclick.net/ddm/activity/src=2542116;type=gblog;cat=googl0;ord=1?' width='1'/> </noscript> <!-- Header --> <div class='header-outer'> <div class='header-inner'> <div class='section' id='header'><div class='widget Header' data-version='1' id='Header1'> <div class='header-left'> <div class='header-title'> <a class='google-logo' href='https://testing.googleblog.com/'> <img height='50' src='https://www.gstatic.com/images/branding/googlelogo/2x/googlelogo_color_150x54dp.png'/> </a> <a href='/.'> <h2> Testing Blog </h2> </a> </div> <div class='header-desc'> </div> </div> </div></div> </div> </div> <!-- all content wrapper start --> <div class='cols-wrapper loading'> <div class='col-main-wrapper'> <div class='col-main'> <div class='section' id='main'><div class='widget Blog' data-version='1' id='Blog1'> <div class='post' data-id='4811369746547225829' itemscope='' itemtype='http://schema.org/BlogPosting'> <h2 class='title' itemprop='name'> <a href='https://testing.googleblog.com/2009/08/super-fast-js-testing.html' itemprop='url' title='Super Fast JS Testing'> Super Fast JS Testing </a> </h2> <div class='post-header'> <div class='published'> <span class='publishdate' itemprop='datePublished'> Wednesday, August 12, 2009 </span> </div> </div> <div class='post-body'> <div class='post-content' itemprop='articleBody'> <script type='text/template'> <div> <br /> <br /> by <a href="http://theshyam.com/">Shyam Seshadri</a><br /> <br /> Before I jump into how exactly you can perform super fast and easy JS testing, let me give you some background on the problem.<br /> <br /> Javascript is a finicky language (Some people even hesitate to call it a language). And it can easily grow and become a horrible and complicated beast, incapable of being tamed once let loose. And testing it is a nightmare. Once you have decided on a framework (of which there are a dime a dozen), you then have to set it up to run just right. You need to set it up to actually run your tests. Then you have to figure out how to run it in a continuous integration environment. Maybe even run it in headless mode. And everyone solves it in their own ways.<br /> <br /> But the biggest problem I have with most of these frameworks is that executing the tests usually requires a context switch. By that, I mean to run a JSUnit test, you end up usually having to open the browser, browse to a particular url or html page which then runs the test. Then you have to look at the results there, and then come back to your editor to either proceed further or fix your tests. Works, but really slows down development.<br /> <br /> In java, all it takes is to click the run button in your IDE to run your tests. You get instant feedback, a green / red bar and details on which tests passed and failed and at what line. No context switch, you can get it to run at every save, and proceed on your merry way. Till now, this was not possible with Javascript.<br /> <br /> But now, we have <a href="http://code.google.com/p/js-test-driver/" onclick="javascript:pageTracker._trackPageview('/outbound/article/code.google.com');" target="_blank">JS Test Driver</a>. My colleagues Jeremie and <a href="http://misko.hevery.com/" onclick="javascript:pageTracker._trackPageview('/outbound/article/misko.hevery.com');" target="_blank">Misko</a> ended up running into some of the issues I outlined above, and decided that going along with the flow was simply unacceptable. So they created a JS Testing framework which solves these very things. You can capture any browser on any machine, and when you tell it to run tests, it will go ahead and execute them on all these browsers and return you the results in your client. And its blazing fast. I am talking milliseconds to run 100 odd tests. And you can tell it to rerun your tests at each save. All within the comforts of your IDE. And over the last three weeks, I have been working on the eclipse plugin for JS Test Driver, and its now at the point where its in a decent working condition.<br /> <div id="attachment_165" style="width: 438px;"> <a href="http://theshyam.com/wp-content/uploads/2009/08/JS-Test-Driver-Plugin.png"><img alt="The plugin in action" height="478" src="https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_vedS2x47gB5fJ6gbCwPYt5qwoPyBR3wCsa0bkRu7nbWzxXvGKTalja47EPtJKBvqbFhaFm4_v5j2t-1GScbzr4eVoaRykxCjyU_y-CouiE-7-Q55mcrL-Pu-TdE9Rgn_rog60J2o71JtoZ=s0-d" title="JS Test Driver Plugin" width="428"></a>The plugin in action</div> <br /> The plugin allows you to, from within Eclipse, start the JS Test Driver server, capture some browsers, and then run your tests. You get pretty icons telling you what browsers were captured, the state of the server, the state of the tests. It allows you to filter and show only failures, rerun your last launch configuration, even setup the paths to your browsers so you can launch it all from the safety of eclipse. And as you can see, its super fast. <strong><em>Some 100 odd tests in less than 10 ms</em></strong>. If thats not fast, I don&#8217;t know what is.<br /> <br /> For more details on JS Test Driver, visit its <a href="http://code.google.com/p/js-test-driver/" onclick="javascript:pageTracker._trackPageview('/outbound/article/code.google.com');" target="_blank">Google Code</a> website and see how you can use it in your next project and even integrate it into a continuous integration. Misko talks a little bit more about the motivations behind writing it on his <a href="http://misko.hevery.com/2009/05/22/yet-another-javascript-testing-framework/" onclick="javascript:pageTracker._trackPageview('/outbound/article/misko.hevery.com');" target="_blank">Yet Another JS Testing Framework</a> post. To try out the plugin for yourselves, go add the following update site to eclipse:<br /> <br /> <strong>http://js-test-driver.googlecode.com/svn/update/</strong><br /> <br /> <strong> </strong>For all you IntelliJ fanatics, there is something similar in the works.</div> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </script> <noscript> <div> <br /> <br /> by <a href="http://theshyam.com/">Shyam Seshadri</a><br /> <br /> Before I jump into how exactly you can perform super fast and easy JS testing, let me give you some background on the problem.<br /> <br /> Javascript is a finicky language (Some people even hesitate to call it a language). And it can easily grow and become a horrible and complicated beast, incapable of being tamed once let loose. And testing it is a nightmare. Once you have decided on a framework (of which there are a dime a dozen), you then have to set it up to run just right. You need to set it up to actually run your tests. Then you have to figure out how to run it in a continuous integration environment. Maybe even run it in headless mode. And everyone solves it in their own ways.<br /> <br /> But the biggest problem I have with most of these frameworks is that executing the tests usually requires a context switch. By that, I mean to run a JSUnit test, you end up usually having to open the browser, browse to a particular url or html page which then runs the test. Then you have to look at the results there, and then come back to your editor to either proceed further or fix your tests. Works, but really slows down development.<br /> <br /> In java, all it takes is to click the run button in your IDE to run your tests. You get instant feedback, a green / red bar and details on which tests passed and failed and at what line. No context switch, you can get it to run at every save, and proceed on your merry way. Till now, this was not possible with Javascript.<br /> <br /> But now, we have <a href="http://code.google.com/p/js-test-driver/" onclick="javascript:pageTracker._trackPageview('/outbound/article/code.google.com');" target="_blank">JS Test Driver</a>. My colleagues Jeremie and <a href="http://misko.hevery.com/" onclick="javascript:pageTracker._trackPageview('/outbound/article/misko.hevery.com');" target="_blank">Misko</a> ended up running into some of the issues I outlined above, and decided that going along with the flow was simply unacceptable. So they created a JS Testing framework which solves these very things. You can capture any browser on any machine, and when you tell it to run tests, it will go ahead and execute them on all these browsers and return you the results in your client. And its blazing fast. I am talking milliseconds to run 100 odd tests. And you can tell it to rerun your tests at each save. All within the comforts of your IDE. And over the last three weeks, I have been working on the eclipse plugin for JS Test Driver, and its now at the point where its in a decent working condition.<br /> <div id="attachment_165" style="width: 438px;"> <a href="http://theshyam.com/wp-content/uploads/2009/08/JS-Test-Driver-Plugin.png"><img alt="The plugin in action" height="478" src="https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_vedS2x47gB5fJ6gbCwPYt5qwoPyBR3wCsa0bkRu7nbWzxXvGKTalja47EPtJKBvqbFhaFm4_v5j2t-1GScbzr4eVoaRykxCjyU_y-CouiE-7-Q55mcrL-Pu-TdE9Rgn_rog60J2o71JtoZ=s0-d" title="JS Test Driver Plugin" width="428"></a>The plugin in action</div> <br /> The plugin allows you to, from within Eclipse, start the JS Test Driver server, capture some browsers, and then run your tests. You get pretty icons telling you what browsers were captured, the state of the server, the state of the tests. It allows you to filter and show only failures, rerun your last launch configuration, even setup the paths to your browsers so you can launch it all from the safety of eclipse. And as you can see, its super fast. <strong><em>Some 100 odd tests in less than 10 ms</em></strong>. If thats not fast, I don&#8217;t know what is.<br /> <br /> For more details on JS Test Driver, visit its <a href="http://code.google.com/p/js-test-driver/" onclick="javascript:pageTracker._trackPageview('/outbound/article/code.google.com');" target="_blank">Google Code</a> website and see how you can use it in your next project and even integrate it into a continuous integration. Misko talks a little bit more about the motivations behind writing it on his <a href="http://misko.hevery.com/2009/05/22/yet-another-javascript-testing-framework/" onclick="javascript:pageTracker._trackPageview('/outbound/article/misko.hevery.com');" target="_blank">Yet Another JS Testing Framework</a> post. To try out the plugin for yourselves, go add the following update site to eclipse:<br /> <br /> <strong>http://js-test-driver.googlecode.com/svn/update/</strong><br /> <br /> <strong> </strong>For all you IntelliJ fanatics, there is something similar in the works.</div> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </noscript> </div> </div> <div class='share'> <span class='twitter-custom social-wrapper' data-href='http://twitter.com/share?text=Google Testing Blog:Super Fast JS Testing&url=https://testing.googleblog.com/2009/08/super-fast-js-testing.html&via=googletesting'> <img alt='Share on Twitter' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_twitter_black_24dp.png' width='24'/> </span> <span class='fb-custom social-wrapper' data-href='https://www.facebook.com/sharer.php?u=https://testing.googleblog.com/2009/08/super-fast-js-testing.html'> <img alt='Share on Facebook' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_facebook_black_24dp.png' width='24'/> </span> </div> <div class='comment-container'> <i class='comment-img material-icons'> &#57529; </i> <a href='https://testing.googleblog.com/2009/08/super-fast-js-testing.html#comments' style='font-weight: 500; text-decoration: underline;'>1 comment</a> </div> <div class='post-footer'> <div class='cmt_iframe_holder' data-href='https://testing.googleblog.com/2009/08/super-fast-js-testing.html' data-viewtype='FILTERED_POSTMOD'></div> <a href='https://plus.google.com/112374322230920073195' rel='author' style='display:none;'> Google </a> <div class='label-footer'> <span class='labels-caption'> Labels: </span> <span class='labels'> <a class='label' href='https://testing.googleblog.com/search/label/JavaScript' rel='tag'> JavaScript </a> , <a class='label' href='https://testing.googleblog.com/search/label/Shyam%20Seshadri' rel='tag'> Shyam Seshadri </a> </span> </div> </div> </div> <div class='post' data-id='8596966213546342619' itemscope='' itemtype='http://schema.org/BlogPosting'> <h2 class='title' itemprop='name'> <a href='https://testing.googleblog.com/2009/07/by-shyam-seshadri-nowadays-when-i-talk.html' itemprop='url' title='The Advantages of Unit Testing Early'> The Advantages of Unit Testing Early </a> </h2> <div class='post-header'> <div class='published'> <span class='publishdate' itemprop='datePublished'> Wednesday, July 15, 2009 </span> </div> </div> <div class='post-body'> <div class='post-content' itemprop='articleBody'> <script type='text/template'> by <a href="http://theshyam.com/">Shyam Seshadri</a><br /><br />Nowadays, when I talk with (read: rant at) anyone about why they should do test driven development or write unit tests, my spiel has gotten extremely similar and redundant to the point that I don't have to think about it anymore. But even when I do pairing with skeptics, even as I cajole and coax testable code or some specific refactorings out of them, I wonder, why is it that I have to convince you of the worth of testing ? Shouldn't it be obvious ?<br /><br />And sadly, it isn't. Not to many people. To many people, I come advocating the rise of the devil itself. To others, it is this redundant, totally useless thing that is covered by the manual testers anyway. The general opinion seems to be, "I'm a software engineer. It is my job to write software. Nowhere in the job description does it say that I have to write these unit tests." Well, to be fair, I haven't heard that too many times, but they might as well be thinking it, given their investment in writing unit tests. And last time I checked, an engineer's role is to deliver a working software. How do you even prove that your software works without having some unit tests to back you up ? Do you pull it up and go through it step by step, and start cursing when it breaks ? Because without unit tests, the odds are that it will.<br /><br />But writing unit tests as you develop isn't just to prove that your code works (though that is a great portion of it). There are so many more benefits to writing unit tests. Lets talk in depth about a few of these below.<br /><br /><b>Instantaneous Gratification</b><br /><br />The biggest and most obvious reason for writing unit tests (either as you go along, or before you even write code) is instantaneous gratification. When I write code (write, not spike. That is a whole different ball game that I won't get into now), I love to know that it works and does what it should do. If you are writing a smaller component of a bigger app (especially one that isn't complete yet), how are you even supposed to know if what you just painstakingly wrote even works or not ? Even the best engineers make mistakes.<br /><br />Whereas with unit tests, I can write my code. Then just hit my shortcut keys to run my tests, and voila, within a second or two, I have the results, telling me that everything passed (in the ideal case) or what failed and at which line, so I know exactly what I need to work on. It just gives you a safety net to fall back on, so you don't have to remember all the ways it is supposed to work in. Something tells you if it is or not.<br /><br />Also, doing Test Driven Development when developing is one of the best ways to keep track of what you are working on. I have times when I am churning out code and tests, one after the other, before I need to take a break. The concept of TDD is that I write a failing test, and then I write just enough code to pass that test. So when I take a break, I make it a point to leave at a failing test, so that when I come back, I can jump right back into writing the code to get it to pass. I don't have to spend 15 - 20 minutes reading through the code to figure out where I left off. My asserts usually tell me exactly what I need to do.<br /><br /><b>Imposing Modularity / Reusability</b><br /><br />The very first rule of reusable code is that you have to be able to instantiate an instance of the class before you can use it. And guess what ? With unit tests, you almost always have to instantiate an instance of the class under test. Therefore, writing a unit test is always a first great step in making code reusable. And the minute you start writing unit tests, most likely, you will start running into the common pain points of not having injectable dependencies (Unless of course, you are one of the converts, in which case, good for you!).<br /><br />Which brings me to the next point. Once you start having to jump through fiery hoops to set up your class just right to test it, you will start to realize when a class is getting bloated, or when a certain component belongs in its own class. For instance, why test the House when what you really want to test is the Kitchen it contains. So if the Kitchen class was initially part of the House, when you start writing unit tests, it becomes obvious enough that it belongs separately. Before long, you have modular classes which are small and self contained and can be tested independently without effort. And it definitely helps keep the code base cleaner and more comprehensible.<br /><br /><b>Refactoring Safety Net</b><br /><br />Any project, no matter what you do, usually ends up at a juncture where the requirements change on you. And you are left with the option of refactoring your codebase to add / change it, or rewrite from scratch. One, never rewrite from scratch, always refactor. Its always faster when you refactor, no matter what you may think. Two, what do you do when you have to refactor and you don't have unit tests ? How do you know you haven't horribly broken something in that refactor ? Granted, IDE's such as Eclipse and IntelliJ have made refactoring much more convenient, but adding new functionality or editing existing features is never simple.<br /><br />More often than not, we end up changing some undocumented way the existing code behaved, and blow up 10 different things (it takes skill to blow up more, believe me, I have tried). And its often something as simple as changing the way a variable is set or unset. In those cases, having unittests (remember those things you were supposed to have written?) to confirm that your refactoring broke nothing is godsend. I can't tell you the amount of times I have had to refactor a legacy code base without this safety net. The only way to ensure I did it correct was to write these large integration tests (because again, no unit tests usually tends to increase the coupling and reduce modularity, even in the most well designed code bases) which verified things at a higher level and pray fervently that I broke nothing. Then I would spend a few minutes bringing up the app everytime, and clicking on random things to make sure nothing blew up. A complete waste of my time when I could have known the same thing by just running my unit tests.<br /><br /><b>Documentation</b><br /><br />Finally, one of my favorite advantages to doing TDD or writing unit tests as I code. I have a short memory for code I have written. I could look back at the code I wrote two days ago, and have no clue what I was thinking. In those cases, all I have to do is go look at the test for a particular method, and that almost always will tell me what that method takes in as parameters, and what all it should be doing. A well constructed set of tests tell you about valid and invalid inputs, state that it should modify and output that it may return.<br /><br />Now this is useful for people like me with short memory spans. But it is also useful, say, when you have a new person joining the team. We had this cushion the last time someone joined our team for a short period of time, and when we asked him to add a particular check to a method, we just pointed him to the tests for that method, which basically told him what the method does. He was able to understand the requirements, and go ahead and add the check with minimal handholding. And the tests give a safety net so he doesn't break anything else while he was at it.<br /><br />Also useful is the fact that later, when someone comes marching through your door, demanding you fix this bug, you can always make sure whether it was a a bug (in which case, you are obviously missing a test case) or if it was a feature that they have now changed the requirements on (in which case you already have a test which proves it was your intent to do it, and thus not a bug). <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </script> <noscript> by <a href="http://theshyam.com/">Shyam Seshadri</a><br /><br />Nowadays, when I talk with (read: rant at) anyone about why they should do test driven development or write unit tests, my spiel has gotten extremely similar and redundant to the point that I don't have to think about it anymore. But even when I do pairing with skeptics, even as I cajole and coax testable code or some specific refactorings out of them, I wonder, why is it that I have to convince you of the worth of testing ? Shouldn't it be obvious ?<br /><br />And sadly, it isn't. Not to many people. To many people, I come advocating the rise of the devil itself. To others, it is this redundant, totally useless thing that is covered by the manual testers anyway. The general opinion seems to be, "I'm a software engineer. It is my job to write software. Nowhere in the job description does it say that I have to write these unit tests." Well, to be fair, I haven't heard that too many times, but they might as well be thinking it, given their investment in writing unit tests. And last time I checked, an engineer's role is to deliver a working software. How do you even prove that your software works without having some unit tests to back you up ? Do you pull it up and go through it step by step, and start cursing when it breaks ? Because without unit tests, the odds are that it will.<br /><br />But writing unit tests as you develop isn't just to prove that your code works (though that is a great portion of it). There are so many more benefits to writing unit tests. Lets talk in depth about a few of these below.<br /><br /><b>Instantaneous Gratification</b><br /><br />The biggest and most obvious reason for writing unit tests (either as you go along, or before you even write code) is instantaneous gratification. When I write code (write, not spike. That is a whole different ball game that I won't get into now), I love to know that it works and does what it should do. If you are writing a smaller component of a bigger app (especially one that isn't complete yet), how are you even supposed to know if what you just painstakingly wrote even works or not ? Even the best engineers make mistakes.<br /><br />Whereas with unit tests, I can write my code. Then just hit my shortcut keys to run my tests, and voila, within a second or two, I have the results, telling me that everything passed (in the ideal case) or what failed and at which line, so I know exactly what I need to work on. It just gives you a safety net to fall back on, so you don't have to remember all the ways it is supposed to work in. Something tells you if it is or not.<br /><br />Also, doing Test Driven Development when developing is one of the best ways to keep track of what you are working on. I have times when I am churning out code and tests, one after the other, before I need to take a break. The concept of TDD is that I write a failing test, and then I write just enough code to pass that test. So when I take a break, I make it a point to leave at a failing test, so that when I come back, I can jump right back into writing the code to get it to pass. I don't have to spend 15 - 20 minutes reading through the code to figure out where I left off. My asserts usually tell me exactly what I need to do.<br /><br /><b>Imposing Modularity / Reusability</b><br /><br />The very first rule of reusable code is that you have to be able to instantiate an instance of the class before you can use it. And guess what ? With unit tests, you almost always have to instantiate an instance of the class under test. Therefore, writing a unit test is always a first great step in making code reusable. And the minute you start writing unit tests, most likely, you will start running into the common pain points of not having injectable dependencies (Unless of course, you are one of the converts, in which case, good for you!).<br /><br />Which brings me to the next point. Once you start having to jump through fiery hoops to set up your class just right to test it, you will start to realize when a class is getting bloated, or when a certain component belongs in its own class. For instance, why test the House when what you really want to test is the Kitchen it contains. So if the Kitchen class was initially part of the House, when you start writing unit tests, it becomes obvious enough that it belongs separately. Before long, you have modular classes which are small and self contained and can be tested independently without effort. And it definitely helps keep the code base cleaner and more comprehensible.<br /><br /><b>Refactoring Safety Net</b><br /><br />Any project, no matter what you do, usually ends up at a juncture where the requirements change on you. And you are left with the option of refactoring your codebase to add / change it, or rewrite from scratch. One, never rewrite from scratch, always refactor. Its always faster when you refactor, no matter what you may think. Two, what do you do when you have to refactor and you don't have unit tests ? How do you know you haven't horribly broken something in that refactor ? Granted, IDE's such as Eclipse and IntelliJ have made refactoring much more convenient, but adding new functionality or editing existing features is never simple.<br /><br />More often than not, we end up changing some undocumented way the existing code behaved, and blow up 10 different things (it takes skill to blow up more, believe me, I have tried). And its often something as simple as changing the way a variable is set or unset. In those cases, having unittests (remember those things you were supposed to have written?) to confirm that your refactoring broke nothing is godsend. I can't tell you the amount of times I have had to refactor a legacy code base without this safety net. The only way to ensure I did it correct was to write these large integration tests (because again, no unit tests usually tends to increase the coupling and reduce modularity, even in the most well designed code bases) which verified things at a higher level and pray fervently that I broke nothing. Then I would spend a few minutes bringing up the app everytime, and clicking on random things to make sure nothing blew up. A complete waste of my time when I could have known the same thing by just running my unit tests.<br /><br /><b>Documentation</b><br /><br />Finally, one of my favorite advantages to doing TDD or writing unit tests as I code. I have a short memory for code I have written. I could look back at the code I wrote two days ago, and have no clue what I was thinking. In those cases, all I have to do is go look at the test for a particular method, and that almost always will tell me what that method takes in as parameters, and what all it should be doing. A well constructed set of tests tell you about valid and invalid inputs, state that it should modify and output that it may return.<br /><br />Now this is useful for people like me with short memory spans. But it is also useful, say, when you have a new person joining the team. We had this cushion the last time someone joined our team for a short period of time, and when we asked him to add a particular check to a method, we just pointed him to the tests for that method, which basically told him what the method does. He was able to understand the requirements, and go ahead and add the check with minimal handholding. And the tests give a safety net so he doesn't break anything else while he was at it.<br /><br />Also useful is the fact that later, when someone comes marching through your door, demanding you fix this bug, you can always make sure whether it was a a bug (in which case, you are obviously missing a test case) or if it was a feature that they have now changed the requirements on (in which case you already have a test which proves it was your intent to do it, and thus not a bug). <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </noscript> </div> </div> <div class='share'> <span class='twitter-custom social-wrapper' data-href='http://twitter.com/share?text=Google Testing Blog:The Advantages of Unit Testing Early&url=https://testing.googleblog.com/2009/07/by-shyam-seshadri-nowadays-when-i-talk.html&via=googletesting'> <img alt='Share on Twitter' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_twitter_black_24dp.png' width='24'/> </span> <span class='fb-custom social-wrapper' data-href='https://www.facebook.com/sharer.php?u=https://testing.googleblog.com/2009/07/by-shyam-seshadri-nowadays-when-i-talk.html'> <img alt='Share on Facebook' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_facebook_black_24dp.png' width='24'/> </span> </div> <div class='comment-container'> <i class='comment-img material-icons'> &#57529; </i> <a href='https://testing.googleblog.com/2009/07/by-shyam-seshadri-nowadays-when-i-talk.html#comments' style='font-weight: 500; text-decoration: underline;'>14 comments</a> </div> <div class='post-footer'> <div class='cmt_iframe_holder' data-href='https://testing.googleblog.com/2009/07/by-shyam-seshadri-nowadays-when-i-talk.html' data-viewtype='FILTERED_POSTMOD'></div> <a href='https://plus.google.com/112374322230920073195' rel='author' style='display:none;'> Google </a> <div class='label-footer'> <span class='labels-caption'> Labels: </span> <span class='labels'> <a class='label' href='https://testing.googleblog.com/search/label/Shyam%20Seshadri' rel='tag'> Shyam Seshadri </a> </span> </div> </div> </div> <div class='post' data-id='3592174159500685132' itemscope='' itemtype='http://schema.org/BlogPosting'> <h2 class='title' itemprop='name'> <a href='https://testing.googleblog.com/2009/07/why-are-we-embarrassed-to-admit-that-we.html' itemprop='url' title='Why are we embarrassed to admit that we don&#39;t know how to write tests?'> Why are we embarrassed to admit that we don't know how to write tests? </a> </h2> <div class='post-header'> <div class='published'> <span class='publishdate' itemprop='datePublished'> Wednesday, July 08, 2009 </span> </div> </div> <div class='post-body'> <div class='post-content' itemprop='articleBody'> <script type='text/template'> <span class="Apple-style-span" style="font-family:Times;font-size:medium;"><div style="PADDING-RIGHT: 0.6em; PADDING-LEFT: 0.6em; PADDING-BOTTOM: 0.6em; MARGIN: 0px; FONT: 13px/19px Georgia, 'Times New Roman', 'Bitstream Charter', Times, serif; PADDING-TOP: 0.6em; BACKGROUND-COLOR: rgb(255,255,255); -webkit-background-clip: initial; -webkit-background-origin: initial"><p>Take your average developer and ask "do you know language/technology X?" None of us will feel any shame in admitting that we do not know X. After all there are so many languages, frameworks and technologies, how could you know them all? But what if X is writing testable code? Somehow we have trouble answering the question "do you know how to write tests?" Everyone says yes, whether or not we actually know it. It is as if there is some shame in admitting that you don't know how to write tests.</p><p>Now I am not suggesting that people knowingly lie here, it is just that they think there is nothing to it. We think: I know how to write code, I think my code is pretty good, therefore my code is testable!</p><p>I personally think that we would do a lot better if we would recognize testability as a skill in its own right. And as such skills are not innate and take years of practice to develop. We could than treat it as any other skill and freely admit that we don't know it. We could than do something about it. We could offer classes, or other materials to grow our developers, but instead we treat it like breathing. We think that any developer can write testable code.</p><p>It took me two years of writing tests first, where I had as much tests as production code, before I started to understand what is the difference between testable and hard to test code. Ask yourself, how long have you been writing tests? What percentage of the code you write is tests?</p><p>Here is a question which you can ask to prove my point: "How do you write hard to test code?" I like to ask this question in interviews and most of the time I get silence. Sometimes I get people to say, make things private. Well if visibility is your only problem, I have a RegExp for you which will solve all of your problems. The truth is a lot more complicated, the code is hard to test doe to its structure, not doe to its naming conventions or visibility. <a href="http://misko.hevery.com/2008/07/30/top-10-things-which-make-your-code-hard-to-test/" mce_href="http://misko.hevery.com/2008/07/30/top-10-things-which-make-your-code-hard-to-test/">Do you know the answer?</a></p><p>We all start at the same place. When I first heard about testing I immediately thought about writing a framework which will pretend to be a user so that I can put the app through its paces. It is only natural to thing this way. This kind of tests are called end-to-end-tests (or scenario or large tests), and they should be the last kind of tests which you write not the first thing you think of. End-to-end-tests are great for locating <a href="http://misko.hevery.com/2008/11/17/unified-theory-of-bugs/" mce_href="http://misko.hevery.com/2008/11/17/unified-theory-of-bugs/">wiring bugs</a> but are pretty bad at locating <a href="http://misko.hevery.com/2008/11/17/unified-theory-of-bugs/" mce_href="http://misko.hevery.com/2008/11/17/unified-theory-of-bugs/">logical bugs</a>. And most of your mistakes are in logical bugs, those are the hard ones to find. I find it a bit amusing that to fight buggy code we write even more complex framework which will pretends to be the user, so now we have even more code to test.</p><p>Everyone is in search of some magic test framework, technology, the know-how, which will solve the testing woes. Well I have news for you: there is no such thing. <span class="Apple-style-span" style="FONT-WEIGHT: bold" mce_style="font-weight: bold;" mce_name="strong">The secret in tests is in writing testable code</span>, not in knowing some magic on testing side. And it certainly is not in some company which will sell you some test automation framework. Let me make this super clear: <span class="Apple-style-span" style="FONT-WEIGHT: bold" mce_style="font-weight: bold;" mce_name="strong">The secret in testing is in writing testable-code</span>! You need to go after your developers not your test-organization.</p><p>Now lets think about this. Most organizations have developers which write code and than a test organization to test it. So let me make sure I understand. There is a group of people which write untestable code and a group which desperately tries to put tests around the untestable code. (Oh and test-group is not allowed to change the production code.) The developers are where the mistakes are made, and testers are the ones who feel the pain. Do you think that the developers have any incentive to change their behavior if they don't feel the pain of their mistakes? Can the test-organization be effective if they can't change the production code?</p><p>It is so easy to hide behind a "framework" which needs to be built/bought and things will be better. But the root cause is the untestable code, and until we learn to admit that we don't know how to write testable code, nothing is going to change...</p></div></span> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </script> <noscript> <span class="Apple-style-span" style="font-family:Times;font-size:medium;"><div style="PADDING-RIGHT: 0.6em; PADDING-LEFT: 0.6em; PADDING-BOTTOM: 0.6em; MARGIN: 0px; FONT: 13px/19px Georgia, 'Times New Roman', 'Bitstream Charter', Times, serif; PADDING-TOP: 0.6em; BACKGROUND-COLOR: rgb(255,255,255); -webkit-background-clip: initial; -webkit-background-origin: initial"><p>Take your average developer and ask "do you know language/technology X?" None of us will feel any shame in admitting that we do not know X. After all there are so many languages, frameworks and technologies, how could you know them all? But what if X is writing testable code? Somehow we have trouble answering the question "do you know how to write tests?" Everyone says yes, whether or not we actually know it. It is as if there is some shame in admitting that you don't know how to write tests.</p><p>Now I am not suggesting that people knowingly lie here, it is just that they think there is nothing to it. We think: I know how to write code, I think my code is pretty good, therefore my code is testable!</p><p>I personally think that we would do a lot better if we would recognize testability as a skill in its own right. And as such skills are not innate and take years of practice to develop. We could than treat it as any other skill and freely admit that we don't know it. We could than do something about it. We could offer classes, or other materials to grow our developers, but instead we treat it like breathing. We think that any developer can write testable code.</p><p>It took me two years of writing tests first, where I had as much tests as production code, before I started to understand what is the difference between testable and hard to test code. Ask yourself, how long have you been writing tests? What percentage of the code you write is tests?</p><p>Here is a question which you can ask to prove my point: "How do you write hard to test code?" I like to ask this question in interviews and most of the time I get silence. Sometimes I get people to say, make things private. Well if visibility is your only problem, I have a RegExp for you which will solve all of your problems. The truth is a lot more complicated, the code is hard to test doe to its structure, not doe to its naming conventions or visibility. <a href="http://misko.hevery.com/2008/07/30/top-10-things-which-make-your-code-hard-to-test/" mce_href="http://misko.hevery.com/2008/07/30/top-10-things-which-make-your-code-hard-to-test/">Do you know the answer?</a></p><p>We all start at the same place. When I first heard about testing I immediately thought about writing a framework which will pretend to be a user so that I can put the app through its paces. It is only natural to thing this way. This kind of tests are called end-to-end-tests (or scenario or large tests), and they should be the last kind of tests which you write not the first thing you think of. End-to-end-tests are great for locating <a href="http://misko.hevery.com/2008/11/17/unified-theory-of-bugs/" mce_href="http://misko.hevery.com/2008/11/17/unified-theory-of-bugs/">wiring bugs</a> but are pretty bad at locating <a href="http://misko.hevery.com/2008/11/17/unified-theory-of-bugs/" mce_href="http://misko.hevery.com/2008/11/17/unified-theory-of-bugs/">logical bugs</a>. And most of your mistakes are in logical bugs, those are the hard ones to find. I find it a bit amusing that to fight buggy code we write even more complex framework which will pretends to be the user, so now we have even more code to test.</p><p>Everyone is in search of some magic test framework, technology, the know-how, which will solve the testing woes. Well I have news for you: there is no such thing. <span class="Apple-style-span" style="FONT-WEIGHT: bold" mce_style="font-weight: bold;" mce_name="strong">The secret in tests is in writing testable code</span>, not in knowing some magic on testing side. And it certainly is not in some company which will sell you some test automation framework. Let me make this super clear: <span class="Apple-style-span" style="FONT-WEIGHT: bold" mce_style="font-weight: bold;" mce_name="strong">The secret in testing is in writing testable-code</span>! You need to go after your developers not your test-organization.</p><p>Now lets think about this. Most organizations have developers which write code and than a test organization to test it. So let me make sure I understand. There is a group of people which write untestable code and a group which desperately tries to put tests around the untestable code. (Oh and test-group is not allowed to change the production code.) The developers are where the mistakes are made, and testers are the ones who feel the pain. Do you think that the developers have any incentive to change their behavior if they don't feel the pain of their mistakes? Can the test-organization be effective if they can't change the production code?</p><p>It is so easy to hide behind a "framework" which needs to be built/bought and things will be better. But the root cause is the untestable code, and until we learn to admit that we don't know how to write testable code, nothing is going to change...</p></div></span> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </noscript> </div> </div> <div class='share'> <span class='twitter-custom social-wrapper' data-href='http://twitter.com/share?text=Google Testing Blog:Why are we embarrassed to admit that we don&#39;t know how to write tests?&url=https://testing.googleblog.com/2009/07/why-are-we-embarrassed-to-admit-that-we.html&via=googletesting'> <img alt='Share on Twitter' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_twitter_black_24dp.png' width='24'/> </span> <span class='fb-custom social-wrapper' data-href='https://www.facebook.com/sharer.php?u=https://testing.googleblog.com/2009/07/why-are-we-embarrassed-to-admit-that-we.html'> <img alt='Share on Facebook' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_facebook_black_24dp.png' width='24'/> </span> </div> <div class='comment-container'> <i class='comment-img material-icons'> &#57529; </i> <a href='https://testing.googleblog.com/2009/07/why-are-we-embarrassed-to-admit-that-we.html#comments' style='font-weight: 500; text-decoration: underline;'>8 comments</a> </div> <div class='post-footer'> <div class='cmt_iframe_holder' data-href='https://testing.googleblog.com/2009/07/why-are-we-embarrassed-to-admit-that-we.html' data-viewtype='FILTERED_POSTMOD'></div> <a href='https://plus.google.com/112374322230920073195' rel='author' style='display:none;'> Google </a> <div class='label-footer'> <span class='labels-caption'> Labels: </span> <span class='labels'> <a class='label' href='https://testing.googleblog.com/search/label/Shyam%20Seshadri' rel='tag'> Shyam Seshadri </a> </span> </div> </div> </div> <div class='post' data-id='1183337849722593346' itemscope='' itemtype='http://schema.org/BlogPosting'> <h2 class='title' itemprop='name'> <a href='https://testing.googleblog.com/2009/07/separation-anxiety.html' itemprop='url' title='Separation anxiety?'> Separation anxiety? </a> </h2> <div class='post-header'> <div class='published'> <span class='publishdate' itemprop='datePublished'> Monday, July 06, 2009 </span> </div> </div> <div class='post-body'> <div class='post-content' itemprop='articleBody'> <script type='text/template'> by <a href="http://assertionfailed.wordpress.com/about/">Shyam Seshadri</a><br /><br /><p>We all have separation anxiety. Its a human tendency. We love inertia, and we don&#8217;t like change. But why should your code have separation anxiety ? Its not human (even though it might try and grow a brain of its own at times)!</p><br /><p>I bring this up because I got the chance to work with someone who had some questions on how to test UI code. Fairly innocuous question, and in most cases, my response would have been, keep the UI code simple and free of any logic, and don&#8217;t worry too much about it. Or you could write some nice end to end / integration tests / browser based tests. So with that response set in mind, I set off into the unknown. Little was I to know was that was the least of my concerns. As I sat down to look at the code, I saw that there were already tests for the code. I was optimistic now, I mean, how bad could things be if there are already tests for it ?</p><br /><p>Well, I should remember next time to actually look at the tests first. But anyways, there were tests, so I was curious what kinds of tests they wanted to write and what kind of help I could provide, if any. So it turns out, the class was some sort of GUI Component, which basically had some fields, and depending on whether they were set of not, displayed them as widgets inside of it. So there were, say, 5 fields, and differing combinations of what was set would produce different output. The nice thing was that the rendered data was returned as a nice Java object, so you could easily assert on what was set, and get a handle on the widgets inside of it, etc. So the method was something along the following lines :</p><br /><pre><span style="color: rgb(51, 51, 51);">public RenderedWidgetGroup render() {<br /></span><span style="color: rgb(51, 51, 51);"> </span><span style="color: rgb(51, 51, 51);">RenderedWidgetGroup group =<br /> createWidgetGroup(this.componentId,<br /> this.parent);</span><br /><span style="color: rgb(51, 51, 51);"> if (this.name = null) {</span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(51, 51, 51);"> return group;</span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(51, 51, 51);"> } </span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(51, 51, 51);"> group.addWidget(new TextWidget(this.name));</span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(51, 51, 51);"> group.addWidget(<br /> new DateWidget(<br /> this.updatedTimestamp == null ?<br /> this.createdTimestamp : this.updatedTimestamp));<br /></span><span style="color: rgb(51, 51, 51);"> </span><span style="color: rgb(51, 51, 51);">return group;</span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(51, 51, 51);">}</span></pre><br /><p>So far, so good, right ? Nice, clean, should be easy to test if we can set up this component with the right fields. After that, it should just be a few tests based on the different code paths defined by the conditionals. Yeah, thats what I thought too. So, me, being the naive guy that I was, said, yeah, that looks nice, should be easy to test. I don&#8217;t see the problem.</p><br /><p>Well, then I was taken to the tests. The first thing I see is a huge test. Or atleast thats what I think it is. Then I read it more closely, and see its a private method. It seems to take in a bunch of fields (Fields with names that I distinctly remembered from just a while ago) and churn out a POJO (Plain Old Java Object). Except this POJO was not the GUI Component object I expected. So obviously, I was curious (and my testing sensors were starting to tingle). So I followed through to where it was called (which wasn&#8217;t very hard, it was a private method) and lo and behold, my worst fears confirmed.</p><br /><p>The POJO object generated by the private method was passed in to the constructor of the GUI component, which (on following it further down the rabbit hole) in its constructor did something like the following :</p><br /><pre><span style="color: rgb(51, 51, 51);">public MyGUIComponent(ComponentId id,<br /> Component parent,<br /> MyDataContainingPOJO pojo) {<br /> super(id, parent);<br /> readData(pojo);<br />} </span></pre><br /><p>And of course, <strong>readData</strong>, as you would expect, is a :</p><br /><ul><br /><li>Private method</li><br /><li>Looks through the POJO</li><br /><li>If it finds a field which is not null then it sets it in the Gui Component</li><br /></ul><br /><p>And of course, without writing the exact opposite of this method in the unit test, it just wasn&#8217;t possible to write unit tests. And sudddenly, it became clear why they were having trouble unit testing their Gui Components. Because if they wanted to test render (Which was really their aim), they would have to set up this POJO with the correct fields (which of course, to make things more interesting / miserable, had sub POJOs with sub POJOs of their own. Yay!) to be exercised in their test.</p><br /><p>The problem with this approach is two fold :</p><br /><ol><br /><li>I need tests to ensure that the parsing and reading from the POJO logic is sound, and that it correctly sets up the GUI Component.</li><br /><li>Every time I want to test the render logic, I end up testing (unintentionally, and definitely unwantedly) the parsing logic.</li><br /></ol><br /><p>This also adds, as I saw, obviously complicated pre test setup logic which should not be required to test something completely different. This is a HUGE <strong>code smell</strong>. Unit testing a class should not be an arduous, painful task. It should be easy as setting up a POJO and testing a method. The minute you have to perform complicated setup to Unit test a class (Note, the keyword is unit test. You can have integration tests which need some non trivial setup.), stop! There is something wrong.</p><br /><p>The problem here is that there is a mixing of concerns in the MyGuiComponent class. As it turns out, MyGuiComponent breaks a few fundamental rules of testability. One, it does <strong>work in the constructor</strong>. Two, it violates the <strong>law of demeter</strong>, which states that the class should ask for what it needs, not what it doesn&#8217;t need to get what it needs (Does that even make sense ?). Thirdly, it is <strong>mixing concerns</strong>. That is, it does too much. It knows both how to create itself as well as do the rendering logic. Let me break this down further :</p><br /><h3>Work in the constructor</h3><br /><p>If you scroll back up and look at the constructor for MyGuiComponent, you will see it calling <strong><em><span style="color: rgb(128, 128, 128);">readData(pojo)</span></em></strong>. Now, the basic concept to test any class is that you have to create an instance of the class under test (unless it has static methods. Don&#8217;t get me started on that&#8230;). So now, every time you create an instance of MyGuiComponent, guess what ? <strong><em><span style="color: rgb(128, 128, 128);">readData(pojo)</span></em></strong> is going to get called. <strong>Every. Single. Time</strong> ! And it cannot be mocked out. Its a private method. And god forbid if you really didn&#8217;t care about the pojo and passed in a null. Guess what ? It most probably will blow up with a NullPointerException. So suddenly, that innocuous method in the constructor comes back to haunt you when you write yours tests (You are, aren&#8217;t you ?).</p><br /><h3>Law of Demeter</h3><br /><p>Furthermore, if you look at what <strong><em><span style="color: rgb(128, 128, 128);">readData(pojo)</span></em></strong> does, you would be even more concerned. At its base, MyGuiComponent only cares about 6 fields which it needs to render. Depending on the state of each of these fields, it adds widget. So why does the constructor ask for something totally unrelated ? This is a fundamental violation of the Law of Demeter. The Law of Demeter can be summed up as &#8220;Ask for what you need. If you need to go through one object to get what you need, you are breaking it.&#8221;. A much more fancier definition can be found on the web if you care, but the minute you see something like A.B().C() or something along those lines, there is a potential violation.</p><br /><p>In this case, MyGuiComponent doesn&#8217;t really care about the POJO. It only cares about some fields in the POJO, which it then assigns to its own fields. But the constructor still asks for the POJO instead of directly asking for the fields. What this means is that instead of just creating an instance of MyGuiComponent with the required fields in my test, I now have to create the POJO with the required fields and pass that in instead of just setting it directly. Convoluted, anyone ?</p><br /><h3>Mixing Concerns</h3><br /><p>Finally, what could be considered an extension of the previous one, but deserves a rant of its own. What the fundamental problem with the above class is that it is mixing concerns. It knows both how to create itself as well as how to render itself once it has been created. And the way it has been coded enforces that the creation codepath is executed every single time. To provide an analogy for how ridiculous this is, it is like a a Car asking for an Engine Number and then using that number to create its own engine. Why the heck should a car have to know how to create its engine ? Or even a car itself ? Similarly, why should <strong>MyGuiComponent</strong> know how to create itself ? Which is exactly what is happening here.</p><br /><h3>Solution</h3><br /><p>Now that we had arrived at the root of the problem, we immediately went about trying to fix it. My immediate instinct was to pull out MyGuiComponent into the two classes that I was seeing. So we pulled out a MyGuiComponentFactory, which took up the responsibility of taking in the POJO and creating a GuiComponent out of it. Now this was independently testable. We also added a builder pattern to the MyGuiComponent, which the factory leveraged.</p><br /><pre><span style="color: rgb(51, 51, 51);">class MyGuiComponentFactory {</span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(136, 136, 136);"><span style="color: rgb(51, 51, 51);"> MyGuiComponent createFromPojo(ComponentId id,<br /> Component parent,<br /> MyDataContainingPOJO pojo) {<br /> // Actual logic of converting from pojo to<br /> // MyGuiComponent using the builder pattern<br /> }<br />}</span></span><br /><span style="color: rgb(51, 51, 51);">class MyGuiComponent {</span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(51, 51, 51);"> public MyGuiComponent(ComponentId id,<br /> Component parent) {<br /> super(id, parent);<br /> }</span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(51, 51, 51);"> public MyGuiComponent setName(String name) {<br /> this.name = name;<br /> return this;<br /> }</span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(51, 51, 51);">} </span></pre><br /><p>And now, suddenly (and expectedly, I would like to add), the constructor for MyGuiComponent becomse simple. There is no work in the constructor. The fields are set up through setters and the builder pattern. So now, we started writing the unit tests for the render methods. It took about a single line of setup to instantiate MyGuiComponent, and we could test the render method in isolation now. Hallelujah!!</p><br /><p>Disclaimer :<br /><br />No code was harmed / abused in the course of the above blog post. There were no separation issues whatsoever in the end, it was a clean mutual break!</p> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </script> <noscript> by <a href="http://assertionfailed.wordpress.com/about/">Shyam Seshadri</a><br /><br /><p>We all have separation anxiety. Its a human tendency. We love inertia, and we don&#8217;t like change. But why should your code have separation anxiety ? Its not human (even though it might try and grow a brain of its own at times)!</p><br /><p>I bring this up because I got the chance to work with someone who had some questions on how to test UI code. Fairly innocuous question, and in most cases, my response would have been, keep the UI code simple and free of any logic, and don&#8217;t worry too much about it. Or you could write some nice end to end / integration tests / browser based tests. So with that response set in mind, I set off into the unknown. Little was I to know was that was the least of my concerns. As I sat down to look at the code, I saw that there were already tests for the code. I was optimistic now, I mean, how bad could things be if there are already tests for it ?</p><br /><p>Well, I should remember next time to actually look at the tests first. But anyways, there were tests, so I was curious what kinds of tests they wanted to write and what kind of help I could provide, if any. So it turns out, the class was some sort of GUI Component, which basically had some fields, and depending on whether they were set of not, displayed them as widgets inside of it. So there were, say, 5 fields, and differing combinations of what was set would produce different output. The nice thing was that the rendered data was returned as a nice Java object, so you could easily assert on what was set, and get a handle on the widgets inside of it, etc. So the method was something along the following lines :</p><br /><pre><span style="color: rgb(51, 51, 51);">public RenderedWidgetGroup render() {<br /></span><span style="color: rgb(51, 51, 51);"> </span><span style="color: rgb(51, 51, 51);">RenderedWidgetGroup group =<br /> createWidgetGroup(this.componentId,<br /> this.parent);</span><br /><span style="color: rgb(51, 51, 51);"> if (this.name = null) {</span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(51, 51, 51);"> return group;</span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(51, 51, 51);"> } </span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(51, 51, 51);"> group.addWidget(new TextWidget(this.name));</span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(51, 51, 51);"> group.addWidget(<br /> new DateWidget(<br /> this.updatedTimestamp == null ?<br /> this.createdTimestamp : this.updatedTimestamp));<br /></span><span style="color: rgb(51, 51, 51);"> </span><span style="color: rgb(51, 51, 51);">return group;</span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(51, 51, 51);">}</span></pre><br /><p>So far, so good, right ? Nice, clean, should be easy to test if we can set up this component with the right fields. After that, it should just be a few tests based on the different code paths defined by the conditionals. Yeah, thats what I thought too. So, me, being the naive guy that I was, said, yeah, that looks nice, should be easy to test. I don&#8217;t see the problem.</p><br /><p>Well, then I was taken to the tests. The first thing I see is a huge test. Or atleast thats what I think it is. Then I read it more closely, and see its a private method. It seems to take in a bunch of fields (Fields with names that I distinctly remembered from just a while ago) and churn out a POJO (Plain Old Java Object). Except this POJO was not the GUI Component object I expected. So obviously, I was curious (and my testing sensors were starting to tingle). So I followed through to where it was called (which wasn&#8217;t very hard, it was a private method) and lo and behold, my worst fears confirmed.</p><br /><p>The POJO object generated by the private method was passed in to the constructor of the GUI component, which (on following it further down the rabbit hole) in its constructor did something like the following :</p><br /><pre><span style="color: rgb(51, 51, 51);">public MyGUIComponent(ComponentId id,<br /> Component parent,<br /> MyDataContainingPOJO pojo) {<br /> super(id, parent);<br /> readData(pojo);<br />} </span></pre><br /><p>And of course, <strong>readData</strong>, as you would expect, is a :</p><br /><ul><br /><li>Private method</li><br /><li>Looks through the POJO</li><br /><li>If it finds a field which is not null then it sets it in the Gui Component</li><br /></ul><br /><p>And of course, without writing the exact opposite of this method in the unit test, it just wasn&#8217;t possible to write unit tests. And sudddenly, it became clear why they were having trouble unit testing their Gui Components. Because if they wanted to test render (Which was really their aim), they would have to set up this POJO with the correct fields (which of course, to make things more interesting / miserable, had sub POJOs with sub POJOs of their own. Yay!) to be exercised in their test.</p><br /><p>The problem with this approach is two fold :</p><br /><ol><br /><li>I need tests to ensure that the parsing and reading from the POJO logic is sound, and that it correctly sets up the GUI Component.</li><br /><li>Every time I want to test the render logic, I end up testing (unintentionally, and definitely unwantedly) the parsing logic.</li><br /></ol><br /><p>This also adds, as I saw, obviously complicated pre test setup logic which should not be required to test something completely different. This is a HUGE <strong>code smell</strong>. Unit testing a class should not be an arduous, painful task. It should be easy as setting up a POJO and testing a method. The minute you have to perform complicated setup to Unit test a class (Note, the keyword is unit test. You can have integration tests which need some non trivial setup.), stop! There is something wrong.</p><br /><p>The problem here is that there is a mixing of concerns in the MyGuiComponent class. As it turns out, MyGuiComponent breaks a few fundamental rules of testability. One, it does <strong>work in the constructor</strong>. Two, it violates the <strong>law of demeter</strong>, which states that the class should ask for what it needs, not what it doesn&#8217;t need to get what it needs (Does that even make sense ?). Thirdly, it is <strong>mixing concerns</strong>. That is, it does too much. It knows both how to create itself as well as do the rendering logic. Let me break this down further :</p><br /><h3>Work in the constructor</h3><br /><p>If you scroll back up and look at the constructor for MyGuiComponent, you will see it calling <strong><em><span style="color: rgb(128, 128, 128);">readData(pojo)</span></em></strong>. Now, the basic concept to test any class is that you have to create an instance of the class under test (unless it has static methods. Don&#8217;t get me started on that&#8230;). So now, every time you create an instance of MyGuiComponent, guess what ? <strong><em><span style="color: rgb(128, 128, 128);">readData(pojo)</span></em></strong> is going to get called. <strong>Every. Single. Time</strong> ! And it cannot be mocked out. Its a private method. And god forbid if you really didn&#8217;t care about the pojo and passed in a null. Guess what ? It most probably will blow up with a NullPointerException. So suddenly, that innocuous method in the constructor comes back to haunt you when you write yours tests (You are, aren&#8217;t you ?).</p><br /><h3>Law of Demeter</h3><br /><p>Furthermore, if you look at what <strong><em><span style="color: rgb(128, 128, 128);">readData(pojo)</span></em></strong> does, you would be even more concerned. At its base, MyGuiComponent only cares about 6 fields which it needs to render. Depending on the state of each of these fields, it adds widget. So why does the constructor ask for something totally unrelated ? This is a fundamental violation of the Law of Demeter. The Law of Demeter can be summed up as &#8220;Ask for what you need. If you need to go through one object to get what you need, you are breaking it.&#8221;. A much more fancier definition can be found on the web if you care, but the minute you see something like A.B().C() or something along those lines, there is a potential violation.</p><br /><p>In this case, MyGuiComponent doesn&#8217;t really care about the POJO. It only cares about some fields in the POJO, which it then assigns to its own fields. But the constructor still asks for the POJO instead of directly asking for the fields. What this means is that instead of just creating an instance of MyGuiComponent with the required fields in my test, I now have to create the POJO with the required fields and pass that in instead of just setting it directly. Convoluted, anyone ?</p><br /><h3>Mixing Concerns</h3><br /><p>Finally, what could be considered an extension of the previous one, but deserves a rant of its own. What the fundamental problem with the above class is that it is mixing concerns. It knows both how to create itself as well as how to render itself once it has been created. And the way it has been coded enforces that the creation codepath is executed every single time. To provide an analogy for how ridiculous this is, it is like a a Car asking for an Engine Number and then using that number to create its own engine. Why the heck should a car have to know how to create its engine ? Or even a car itself ? Similarly, why should <strong>MyGuiComponent</strong> know how to create itself ? Which is exactly what is happening here.</p><br /><h3>Solution</h3><br /><p>Now that we had arrived at the root of the problem, we immediately went about trying to fix it. My immediate instinct was to pull out MyGuiComponent into the two classes that I was seeing. So we pulled out a MyGuiComponentFactory, which took up the responsibility of taking in the POJO and creating a GuiComponent out of it. Now this was independently testable. We also added a builder pattern to the MyGuiComponent, which the factory leveraged.</p><br /><pre><span style="color: rgb(51, 51, 51);">class MyGuiComponentFactory {</span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(136, 136, 136);"><span style="color: rgb(51, 51, 51);"> MyGuiComponent createFromPojo(ComponentId id,<br /> Component parent,<br /> MyDataContainingPOJO pojo) {<br /> // Actual logic of converting from pojo to<br /> // MyGuiComponent using the builder pattern<br /> }<br />}</span></span><br /><span style="color: rgb(51, 51, 51);">class MyGuiComponent {</span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(51, 51, 51);"> public MyGuiComponent(ComponentId id,<br /> Component parent) {<br /> super(id, parent);<br /> }</span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(51, 51, 51);"> public MyGuiComponent setName(String name) {<br /> this.name = name;<br /> return this;<br /> }</span><span style="color: rgb(51, 51, 51);"><br /></span><span style="color: rgb(51, 51, 51);">} </span></pre><br /><p>And now, suddenly (and expectedly, I would like to add), the constructor for MyGuiComponent becomse simple. There is no work in the constructor. The fields are set up through setters and the builder pattern. So now, we started writing the unit tests for the render methods. It took about a single line of setup to instantiate MyGuiComponent, and we could test the render method in isolation now. Hallelujah!!</p><br /><p>Disclaimer :<br /><br />No code was harmed / abused in the course of the above blog post. There were no separation issues whatsoever in the end, it was a clean mutual break!</p> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </noscript> </div> </div> <div class='share'> <span class='twitter-custom social-wrapper' data-href='http://twitter.com/share?text=Google Testing Blog:Separation anxiety?&url=https://testing.googleblog.com/2009/07/separation-anxiety.html&via=googletesting'> <img alt='Share on Twitter' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_twitter_black_24dp.png' width='24'/> </span> <span class='fb-custom social-wrapper' data-href='https://www.facebook.com/sharer.php?u=https://testing.googleblog.com/2009/07/separation-anxiety.html'> <img alt='Share on Facebook' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_facebook_black_24dp.png' width='24'/> </span> </div> <div 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href='https://testing.googleblog.com/2017/'> 2017 </a> <span class='post-count' dir='ltr'>(17)</span> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/12/'> Dec </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/11/'> Nov </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/10/'> Oct </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/09/'> Sep </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/08/'> Aug </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/07/'> Jul </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/06/'> Jun </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/05/'> May </a> <span class='post-count' dir='ltr'>(3)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/04/'> Apr </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/02/'> Feb </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/01/'> Jan </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/'> 2016 </a> <span class='post-count' dir='ltr'>(15)</span> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/12/'> Dec </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/11/'> Nov </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/10/'> Oct </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/09/'> Sep </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/08/'> Aug </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/06/'> Jun </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/05/'> May </a> <span class='post-count' dir='ltr'>(3)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/04/'> Apr </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/03/'> Mar </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/02/'> Feb </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2015/'> 2015 </a> <span class='post-count' dir='ltr'>(14)</span> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> 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class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2015/06/'> Jun </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2015/05/'> May </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2015/04/'> Apr </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2015/03/'> Mar </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2015/02/'> Feb </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2015/01/'> Jan </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/'> 2014 </a> <span class='post-count' dir='ltr'>(24)</span> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/12/'> Dec </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/11/'> Nov </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/10/'> Oct </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/09/'> Sep </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/08/'> Aug </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/07/'> Jul </a> <span class='post-count' dir='ltr'>(3)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span 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class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2013/04/'> Apr </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2013/03/'> Mar </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2013/01/'> Jan </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2012/'> 2012 </a> <span class='post-count' dir='ltr'>(11)</span> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2012/12/'> Dec </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2012/11/'> Nov </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2012/10/'> Oct </a> <span class='post-count' dir='ltr'>(3)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2012/09/'> Sep </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2012/08/'> Aug </a> <span class='post-count' dir='ltr'>(4)</span> </li> </ul> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2011/'> 2011 </a> <span class='post-count' dir='ltr'>(39)</span> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2011/11/'> Nov </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2011/10/'> Oct </a> <span class='post-count' dir='ltr'>(5)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2011/09/'> Sep </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' 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&#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2011/01/'> Jan </a> <span class='post-count' dir='ltr'>(3)</span> </li> </ul> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2010/'> 2010 </a> <span class='post-count' dir='ltr'>(37)</span> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2010/12/'> Dec </a> <span class='post-count' dir='ltr'>(3)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2010/11/'> Nov </a> <span class='post-count' dir='ltr'>(3)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2010/10/'> Oct </a> <span class='post-count' dir='ltr'>(4)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2010/09/'> Sep </a> <span class='post-count' dir='ltr'>(8)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> &#9658;&#160; </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2010/08/'> Aug </a> <span class='post-count' dir='ltr'>(3)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a 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