Testing and Debugging in Java

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Unit testing alone is not enough Just because a method seems to perform correctly for a given input doesn t mean that we are done testingWe need to perform other types of tests to ensure the validity of our system Let s briefly discuss some of the additional types of testing you need to do Integration testing determines if objects are working well together, not just alone as in the case of unit testing Functional testing is used to verify that the object actually performs the function that the user expects it to Stress testing shows us how our system performs under the stress of a heavy user load or large number of transactions Certainly all these types of testing are important and must be done However, Dojo doesn t provide any specific support for these are kinds of testing methodologies, so we won t say any more about them here Note
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Although I said I wouldn t talk about any other testing tools, I can t quite help myself There is a Firefox plugin called Selenium that is excellent for testing user interaction with a web application You can get more information and download the plugin at http://seleniumopenqaorg/
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Next let s discuss what happens when unit testing shows us that our program is failing in some way Does Dojo provide any techniques for debugging our application after a problem is discovered
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When good programs go bad it is helpful to know what they were doing when they crossed the line A simple debugging technique is to have the program display some output showing the value of a variable In JavaScript, this can done by using the alert methodThe following line of code could be put into any function to display the value of x at the time that the alert method runs
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alert("Value of x: " + x);
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This code would create a dialog box that would appear on top of the web page An example of an alert box is shown in Figure 172This example assumes that x is used in the program and has the value 7 at the time the alert statement is executed
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This technique is sometimes described as the poor man s debugger It gets the job done, and it works in all browsers but there are a few problems One problem is that you must be sure to remove the code when deploying the applicationYour users certainly don t want to see these messages and have their work interrupted So our dilemma is that we d like to write some messages to display the internal state of our code and have those messages be separate from the output of our page Also, just to be greedy, we d like it if we didn t have to touch any code to turn the messages off when we move the program out of development After all, if we believe the benchmarks, every time we touch code, there is a 5% chance that we unintentionally break something, so we need to minimize code changes
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The solution to our problem is to use loggingYou may be familiar with logging in other environments For example, Java provides a number of logging frameworks such as the open source log4j or the new logging framework built right into the JDK Dojo can give us some of the same functionality of these existing logging frameworks but within in the JavaScript environment To implement logging, Dojo allows us to write messages to a separate area on our page called the consoleThe console will appear at the end of the web page However, if we happen to be using Firebug, which is a plug-in for Firefox, Dojo will write log messages to the Firebug console insteadTo add logging to your page, set the isDebug attribute to true in the <script> tag, which references Dojo as shown in the code here (the attribute is in bold):
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<script type="text/javascript" src="/dojo-release-110/dojo/dojojsuncompressedjs" djConfig="parseOnLoad: true, isDebug: true ></script>
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Now you can write log messages whenever you want Insert a call to consolelog anywhere in your JavaScript where you d like to display the internal state of the program
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consolelog("Value of x: ", x);
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Now, whenever your program executes the consolelog method, output will be sent to the consoleWhen using Internet Explorer or when using Firefox without Firebug, the console is attached to the end of the page Figure 173 provides an example of what the console output would look like in IE
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