Introduction to Testing in Java

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Introduction to Testing
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If you select the Inspect command, a new entry will appear in the Expression view As with the Variables view, primitive variable types show their values directly while object types can be expanded to show their individual elements
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111 INTRODUCTION TO TESTING
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In addition to manually testing an application by running or debugging it, Eclipse supports the JUnit framework (see http://wwwjunitorg) for creating and running repeatable test cases
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Creating Test Cases
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In order to create a test case, you first need to add junitjar (from the orgjunit plug-in) to your project as an external JAR using the Java Build Path > Libraries project property page Once this is done, select the class for which you want to create a test case, open the New wizard, and select the Java > JUnit > TestCase option This invokes the JUnit TestCase wizard (see Figure 1-70), which creates a JUnit test case
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TT 1 Using Eclipse Tools
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Figure 1-70 JUnit TestCase Wizard
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By default, the name of the new test case is the name of the test class with the word Test added to the end You can optionally have the wizard
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Introduction to Testing
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create main(), setup() and teardown() methods as well as test methods for any public or protected method in the test class
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Tip: CodePro includes a more advanced TestCase wizard that provides a number of enhancements over the Eclipse TestCase wizard such as the ability to specify arbitrary test cases, better default code generation and support for creating test fixtures
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Running Test Cases
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Once a test case is created, select the test case class (or the project or package containing the test case) and then select the Run > Run As > JUnit Test command This opens the JUnit view (see Figure 1-71) to show the results of the test run The Failures tab shows a list of the failures that were recorded in the test case and the Hierarchy tab shows the entire test suite as a tree
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TT 1 Using Eclipse Tools
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Figure 1-71 JUnit view
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If there are any test failures, correct the problem and re-run the test by clicking on the Rerun last Test button in the JUnit view Alternatively,
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re-run the last test by selecting it from the Run menu or tool bar button If you need to customize the test configuration, select the Run > Run command to open the Launch Configuration dialog (see Figure 1-65)
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112 SUMMARY
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In this chapter, we have given you a whirlwind tour of the major components of the Eclipse IDE that you will need to use in order to develop Eclipse plugins At this point you should be comfortable navigating the Eclipse user interface and using the built-in Eclipse tools to create, edit, run, debug and test your Java code In the next chapter, we will dive right in and get our hands dirty creating our first Eclipse plug-in Over each succeeding chapter we will introduce more and more layers of detail and slowly convert our plug-in from a simple example into a powerful tool that we can use on a day-to-day basis while doing Eclipse development
TT 1 Using Eclipse Tools
REFERENCES
Eclipse-Overviewpdf Available on the eclipseorg website Sherry Shavor, Jim D Anjou, Scott Fairbrother, Dan Kehn, John Kellerman, Pat McCarthy, The Java Developer s Guide to Eclipse, Addition-Wesley, 2003 Eclipse Wiki http://eclipsewikiswikinet CVS http://wwwcvshomeorg Fowler, Martin, Refactoring: Improving the Design of Existing Code , Addison-Wesley, 1999 http://wwwrefactoringcom JUnit http://wwwjunitorg
C H A P T E R
A Simple Plug-in Example
Before covering each area of commercial plug-in construction in
depth, it is useful to create a simple plug-in on which discussion and examples are based This chapter takes a step-by-step approach to creating a simple but fully operational plug-in that will be enhanced bit-by-bit during the course of this book This process provides valuable first hand experience using the Eclipse IDE and touches on each aspect of building and maintaining a commercial plug-in
TT 2 A Simple Plug-in Example
21 THE FAVORITES PLUG-IN
The Favorites plug-in, which you ll build over the course of this book, displays a list of resources, lets you add and remove resources from this list, easily opens an editor on a selected resource, updates this list automatically as a result of events elsewhere in the system, and more Each of the following chapters discusses aspects of commercial plug-in development in terms of enhancements to the Favorites plug-in This chapter starts the process by covering the creation of the Favorites plug-in in its simplest form using the following steps: Creating a plug-in project Reviewing the generated code Building a product Installing and running the product