Download JUnit in Action, 2nd edition by Petar Tahchiev PDF

By Petar Tahchiev

Whilst JUnit used to be first brought a decade in the past via Kent Beck and Erich Gamma, the Agile move used to be in its infancy, "Test pushed improvement" used to be unknown, and unit trying out was once simply beginning to flow into the common developer's vocabulary. at the present time, such a lot builders recognize some great benefits of unit trying out and depend on the more and more subtle instruments now on hand. The lately published JUnit 4.5 represents the state-of-the-art in unit trying out frameworks, and offers major new positive aspects to enhance the Java improvement process.JUnit in motion, moment version is an up to date advisor to unit trying out Java functions (including Java EE functions) utilizing the JUnit framework and its extensions. This booklet presents suggestions for fixing real-world difficulties corresponding to checking out AJAX purposes, utilizing mocks to accomplish checking out isolation, in-container checking out for Java EE and database purposes, and try out automation.Written to aid readers take advantage of JUnit 4.5, the ebook covers fresh options akin to the hot annotations that simplify attempt writing, greater exception dealing with, and the recent statement equipment. you will additionally observe tips to use JUnit extensions to check new software kinds and frameworks together with Ajax, OSGi, and HTML-based presentation layers.Using a sample-driven method, a number of unit checking out thoughts are coated, equivalent to how you can unit try out EJBs, database purposes, and internet purposes. additionally addressed are checking out suggestions utilizing freely to be had open resource frameworks and instruments, and the way to unit try in isolation with Mock items. The booklet also will carry you up to the mark at the most modern pondering in TDD, BDD, non-stop Integration, and different practices regarding unit checking out.

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Extra resources for JUnit in Action, 2nd edition

Example text

In our case, JUnit calls the three-argument constructor E with the first element in the array, itself an array: {2, 1, 1}. JUnit then calls each @Test method F as usual. JUnit repeats the process for the next array in the getTestParameters collection D. When you compare the test results with the previous example, you see that instead of running one test, the parameterized JUnit test runner ran the same method three times, once for each value in our @Parameters collection. The JUnit class Parameterized is one of JUnit’s many test runners.

In order to have confidence in the program, most developers would expect there to be an automated test for the add feature, no matter how simple the implementation appears. In some cases, we can prove program features through automatic functional tests or automatic acceptance tests. For more about software tests in general, see chapter 3. Testing anything at this point seems problematic. We don’t even have a user interface with which to enter a pair of doubles. We could write a small command-line program that waited for us to type in two double values and then displayed the result.

28 CHAPTER 3 Mastering JUnit Design patterns in action: Inversion of Control Registering a handler with the controller is an example of Inversion of Control. ” Objects register as handlers for an event. When the event occurs, a hook method on the registered object is invoked. HashMap) to act as the registry for your request handlers B. Next, add a protected method, getHandler, to fetch the RequestHandler for a given request C. RuntimeException) D, because this happenstance represents a programming mistake rather than an issue raised by a user or external system.

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