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All environment variables are loaded into Ant s internal properties with the prefix env. (including the trailing period). This gives us properties like env. CATALINA_HOME, which we can then use in tasks related to deployment, for example. Although you can use any prefix for environment variables, it is customary to use env. as the prefix. For consistency, we shall use this convention in the book and build files, and we recommend that readers do the same. Fixing properties to absolute path locations One of the key uses of properties is to abstract file system paths so that tasks deal only with the property names, and the concrete definition is defined, or more likely built up, elsewhere. To craft build files without absolute paths is easy; simply define paths relative from the base directory of the project. Relative paths work great in most cases, PROPERTIES 69

// Place a bid BigDecimal bidAmount = new BigDecimal("100.00"); auction.placeBid(user, bidAmount, new BigDecimal(0), new BigDecimal(0) ); } }

but can cause confusion and problems when passed to a subbuild or handed to a task or another executable that is expecting an absolute path. The <property> task has yet another variation that sets a property to the absolute path of the path specified:

Now, placing a bid with a value of 100 has to fail, because the initial starting price of the auction is 200. TestNG requires that this method throws a BusinessException otherwise the test fails. More fine-grained business exception types let you test failures for core parts of the business logic more accurately. In the end, how many execution paths of your domain model are considered defines your overall business logic test coverage. You can use tools such as cenqua clover (http://www.cenqua.com/clover/), which can extract the code coverage percentage of your test suite and provide many other interesting details about the quality of your system. Let s execute these previous test methods with TestNG and Ant. Creating and running a test suite You can create a test suite dozens of ways with TestNG and start the tests. You can call test methods directly with a click of a button in your IDE (after installing the TestNG plug-in), or you can integrate unit testing in your regular build with an Ant task and an XML description of the test suite. An XML test suite description for the unit tests from the last sections looks as follows:

The builddir property is not simply set to the string build The current project base directory (typically the directory where buildxml resides) is used as the root for relative references and the full path resolved to /home/erik/AntBook/Sections/ Learning/datatypes/build We recommend that you use direct references to files or directories by using the location feature to lock logically relative paths to absolute paths A useful analogy for defining properties for directories is the Unix concept of mount points Logically the root directory / has several underlying top-level directories, yet /usr or /home do not have to physically reside under / Setting properties to mirror this concept allows, for example, the distribution directory of a build to be lifted up and placed elsewhere by simply overriding a single property value Building directory paths up from root directories (ie, the mount points) allows for this capability.

<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" > <suite name="CaveatEmptor" verbose="2"> <test name="BusinessLogic"> <run><include name="logic.*"/></run> <packages> <package name="auction.test"/> </packages> <!-- Or just the class... <classes> <class name="auction.test.AuctionLogic"/> </classes> --> </test> </suite>

A test suite is an assembly of several logical tests don t confuse this with test methods. A logical test is determined at runtime by TestNG. For example, the logical test with the name BusinessLogic includes all test methods (that is, methods marked with @Test) in classes of the auction.test package. These test methods must belong to a group that starts with the name logic; note that .* is a regular expression meaning any number of arbitrary characters. Alternatively, you can list the test classes you d like to consider part of this logical test explicitly, instead of the whole package (or several packages). You can write some test classes and methods, arrange them in any way that is convenient, and then create arbitrary test assemblies by mixing and matching classes, packages, and named groups. This assembly of logical tests from arbitrary classes and packages and the separation into groups with wildcard matching make TestNG more powerful than many other testing frameworks. Save the suite description XML file as test-logic.xml in the base directory of your project. Now, run this test suite with Ant and the following target in your build.xml: