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TestNG Makes Java Unit Testing a Breeze

By Filippo Diotalevi
2005-03-22

Defining test groups
Another interesting feature of TestNG is its ability to define groups of tests. Every test method can be associated with one or more groups; once you've defined these groups, you can choose to run only certain groups of tests. To add a test to a group of tests, simply specify the group as a parameter of the @Test annotation, using the following syntax:

@Test(groups = {"tests.string"})

In this particular case, you declare that the annotated method belongs to the tests.string group. Because the parameter groups is an array, it is possible to specify multiple groups, separating their names with commas. For example, in the sample application, you can create different tests for Strings, numbers, and booleans, and then run them selectively, configuring TestNG as illustrated in Listing 4.
Listing 4. Configuration file with different groups 
<!DOCTYPE suite SYSTEM "http://beust.com/testng/testng-1.0.dtd" >

<suite name="My suite">

  <test name="Simple example">

    <groups>

      <run>

		<include name="tests.string" />

		<include name="tests.math" />

		<exclude name="tests.boolean"/>

      </run>

    </groups>

    <classes>

		.... list classes here....

    </classes>

  </test>

</suite>


Obviously, when you run different groups of tests, the HTML report can show all the tests in a single list, as well as in separate lists for each group, making it possible to immediately understand the source of any problem.



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First Published on IBM DeveloperWorks
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