Using group-by-instances="true" gives TestNGException

[Musaffir Lp]

Hi All,

I came across this behavior

I have 2 test classes as below :

=================================================

public class Test1 

{

@Test

public void first()

{

System.out.println("first-class1");

}

@Test

public void second()

{

System.out.println("second-class1");

}

}

================================================

AND

public class Test2 

{

@Test

public void first()

{

System.out.println("first-class2");

}

@Test

public void second()

{

System.out.println("second-class2");

}

}

================================================

And when i design my testNg xml as below and run it, i get org.testng.TestNGException:  No free nodes found in:[DynamicGraph 

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">

<suite name="Default suite">

  <test verbose="2" name="Default test1" group-by-instances="true">

    <classes>

             <class name="Test2"/>

            <class name="Test1"/>  

    </classes>

  </test> 

</suite>

The issue can be resolved by removing the attribute group-by-instances="true from the test tag

and if there is only one test class present in the test tag, then also there wont be any issue 

i know the default value of group-by-instances is false 

and i wanted to know the functionality of group-by-instances attribute , is it to group the same test class instances together ,and then to run the methods present in that class ? 

If we do not mention this attribute , then also the classes will be executed in the order as they are mentioned in the <test> tag

so what is the purpose of group-by-instances="true ?

Thanks & Warm Regards

Musaffir

[Krishnan Mahadevan]

group-by-instances attribute comes into relevance when you are working with Factories in TestNG.

TestNG provides an annotation called @Factory using which you can basically define your own Test Class (A class which houses one or more @Test annotated test methods). So lets assume that this test class has 2 or more test methods and you would want TestNG to execute all the @Test annotated test methods of a particular instance together, that is when you go for this attribute.

This attribute has effect only when used in conjunction with Factories in TestNG.

 

Thanks & Regards
Krishnan Mahadevan

"All the desirable things in life are either illegal, expensive, fattening or in love with someone else!"
My Scribblings @ http://wakened-cognition.blogspot.com/

My Technical Scribbings @ http://rationaleemotions.wordpress.com/

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[Musaffir Lp]

Thanks again Krishnan, I got it 

Warm Regards

Musaffir