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This post demonstrates a simple example of using groups with TestNG.

For this exercise I’m using a very simple file layout. The jar file was copied directly from the TestNG package. SampleTest.java and testng.xml are my test and configuration files, respectively.

[23:31 20090914 crashing@desktop ~/simpletestng]
$ ls
SampleTest.java testng-5.10-jdk15.jar testng.xml

SampleTest.java has two test methods, annotated with @Test, and with an assigned group name.

import org.testng.annotations.*;
public class SampleTest {
@Test(groups = { “groupA” })
public void methodA() {
System.out.println(“groupA”);
assert true;
}

@Test(groups = { “groupB” })
public void methodB() {
System.out.println(“groupB”);
assert true;
}
}

testng.xml defines these two groups as belonging to a test set.

<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd"&gt;
<suite thread-count="5" verbose="1" name="TrialTest" annotations="JDK">

<test name="TestSet" enabled="true">
<groups>
<run>
<include name="groupA"/>
<include name="groupB"/>
</run>
</groups>

<classes>
<class name="SampleTest"/>
</classes>
</test>

</suite>

I compile the SampleTest class,

$ javac -classpath testng-5.10-jdk15.jar SampleTest.java

and then run all the test methods as configured in testng.xml

$ java -classpath .:testng-5.10-jdk15.jar org.testng.TestNG testng.xml

[Parser] Running:
/Users/crashing/simpletestng/testng.xml

groupA
groupB

===============================================
TrialTest
Total tests run: 2, Failures: 0, Skips: 0
===============================================

Both test methods ran.

Alternatively I can specify specific groups to run. For this I use the -groups and -testclass option. I do not use the testng.xml file.

java -classpath .:testng-5.10-jdk15.jar org.testng.TestNG -groups groupB -testclass SampleTest

[Parser] Running:
Command line suite

groupB

===============================================
Command line suite
Total tests run: 1, Failures: 0, Skips: 0
===============================================

Specifying both the testng.xml and a -groups option will cause both configurations to be processed.

[22:58 20090914 crashing@desktop ~/simpletestng]
$ java -classpath .:testng-5.10-jdk15.jar org.testng.TestNG testng.xml -groups groupA -testclass SampleTest
[Parser] Running:
/Users/crashing/simpletestng/testng.xml
Command line suite

groupA
groupB

===============================================
TrialTest
Total tests run: 2, Failures: 0, Skips: 0
===============================================

groupA

===============================================
Command line suite
Total tests run: 1, Failures: 0, Skips: 0
===============================================

This is probably not what you want. So, use either the testng.xml or the -groups and -testclass option, not both.

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