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10.2.2 Polishing off the build file
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Although you ve seen the syntax for the individual JUnit tasks, you haven t seen how they fit into the overall build file. You have a few remaining things to do, including creating the reports directory and adding a new target to the build file. What you shouldn t need to do is add the junit.jar file. For the simple cases, you don t have to do anything to get JUnit into the classpath. A copy of it comes bundled with Ant, so no additional action is needed. This is more of an issue with older versions of Ant; thankfully this
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Unit testing with JUnit and DBUnit
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Figure 10.1 HTML output for the junitreport task
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problem has disappeared due to more convenient packaging in the more current versions.
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Building the reports directory
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Because your reports are derived products from your source code, much like .class files, they are not checked in version control and are regenerated each time you build the project. So you want to rebuild the reports directory each time you run the complete build. You also want to create the properties that you can reuse throughout the build file. Here s what that looks like:
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<property name="build.classes.dir" value="build/classes"/> <property name="reports.dir" value="build/reports"/> <! Other properties and targets omitted --> <target name="clean"> <delete dir="${build.classes.dir}"/> <delete dir="${reports.dir}"/> </target> <target name="init">
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JUnit
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<mkdir dir="${build.classes.dir}"/> <mkdir dir="${reports.dir}"/> </target>
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As you can see, this code features a new property, ${reports.dir}, which should go near the top of the file, next to the ${build.classes.dir} property. You ve also modified the clean and init tasks so that they delete and create the directory each time.
Adding a testing task
Finally, you want to create a new task, which will run your unit tests and will be called when your normal build target is called. Listing 10.2 shows the new target, as well as the modified build target. Listing 10.2 A new target, test, that runs the unit tests and generate reports, along with the modified build target
<target name="test"> <junit printsummary="true"> <classpath refid="runtime.classpath"/> <batchtest todir="${reports.dir}" > <fileset dir="${build.classes.dir}" includes="**/Test*.class"/> </batchtest> <formatter type="brief" usefile="false"/> <formatter type="xml" usefile="true"/> </junit> <junitreport todir="${reports.dir}"> <fileset dir="${reports.dir}"> <include name="TEST-*.xml"/> </fileset> <report format="frames" todir="${reports.dir}/html"/> </junitreport> </target> <target name="build" depends="clean,generate-hbm,test" description="Compiles all the classes in the chapter, generates the .hbm.xml and runs the unit tests."> </target>
Unit testing with JUnit and DBUnit
As you can see, the new target just runs both JUnit tasks in the proper order. You ve also modified the build target to make sure it runs the unit tests as a standard part of the build. You ve now integrated the JUnit framework into your build process. It should be very straightforward to extend your test coverage by adding new test cases. So having covered a simple unit test, let s kick it up a notch by learning how to test Hibernate code.
10.3 Testing the persistence layer
Let s be honest: using JUnit to test a simple class in isolation is pretty darn trivial. It gets quite a bit more complex when you try to test code that is connected to other systems, such as a database. Some people recommend using Mock objects to stub out things like databases. This works fine, if you re trying to test something like a Struts Action, and you mock your DAOs to return sample data rather than go to the database. But how do you know that your DAOs work correctly Did you write your HQL correctly This section covers the basics of testing your persistence layer, what to test, and when testing is valuable. We ll discuss the fundamentals of what testing a database is all about, as well as what about Hibernate we are testing.
10.3.1 What do we want to test
The first thing you should decide is what you re going to test. An Agile methodology, like Extreme Programming (www.extremeprogramming.org), recommends that you test everything that could possibly break. For your persistence layer, Hibernate, there are a number of things you expect to work. You have to verify them somehow, and unit tests are a great way to do this. Here is an overview of some of the common things you should verify.
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