TestNG parallel Execution with DataProvider

Question

I have a single test which receives data from data provider. I would like this test to run in parallel with different values from data provider .

I tried an approach like :

public class IndependentTest
{
@Test(dataProvider = "dp1" ,threadPoolSize=3,invocationCount=1)

public void testMethod(int number)
{
    Long id = Thread.currentThread().getId();
    System.out.println("HELLO :  " + id);
}


@DataProvider(name = "dp1",parallel=true)
public Object[][] dp1() {
  return new Object[][] {
      new Object[] { 1 },
      new Object[] { 2 },
      new Object[] { 3 },
      new Object[] { 4 },
      new Object[] { 5 },
      new Object[] { 6 },
      new Object[] { 7 },
      new Object[] { 8 }

  };
}

}

The output i received is :

HELLO : 10

HELLO : 12

HELLO : 17

HELLO : 11

HELLO : 16

HELLO : 14

HELLO : 13

HELLO : 15

Spawned 10 threads while i specified 5 in the thread pool size . Could you please tell what has to be added to the above snippet to control the data provider thread pool size .

Answer 1

You need to use dataproviderthreadcount. The threadpoolsize and invocationcount values are not required. See details here.

Answer 2

In testng.xml you can set thread count for the dataprovider via data-provider-thread-count="3"

<suite name="Manage" data-provider-thread-count="3" >
    <test name="Manage data tests">
        <classes>
            <class name="uk.example.ExampleTest"></class>
        </classes>
    </test>
</suite>

Answer 3

Try to set the thread pool in following way:

@BeforeClass
public void setupClassName(ITestContext context) {
    context.getCurrentXmlTest().getSuite().setDataProviderThreadCount(5);
    context.getCurrentXmlTest().getSuite().setPreserveOrder(false);
}

Answer 4

You can achieve this by adding extra configuration 'parallel=true', along with the name of the DataProvider, in its definition. An example is as follows:

@DataProvider(name="InvalidLoginDataProvider", parallel = true)
public Object[][] myDataProviderMethod(){
...
...
}

As per TestNG documentation, the @Test thread pool (created using invocationCount and threadPoolSize parameters in @Test) and Data provider thread pool are different and managed differently.
So, to specify how many threads in Data provider thread pool, one has to add the following configuration in testng.xml file.

<suite name="Suite1" data-provider-thread-count="20" >
...
...
</suite> 

HTH!

Answer 5

I think there is a way to set it on annotation level, it should be add on the DataProvider's :

@DataProvider(name="quick-screen-list", parallel = true)
        public Object[][] quickScreenDataProvider() {
           .....

Answer 6

Currently only one thread is getting used as you have define invocationCount as 1, if you change it to 3 then three workers thread will get used.

invocationCount :- The number of times this method should be invoked.

threadPoolSize :- The size of the thread pool for this method. The method will be invoked from multiple threads as specified by invocationCount. Note: this attribute is ignored if invocationCount is not specified.

Also,

You can also specify that a @Test method should be invoked from different threads. You can use the attribute threadPoolSize to achieve this result:

@Test(threadPoolSize = 3, invocationCount = 10,  timeOut = 10000)
public void testServer() {

In this example, the function testServer will be invoked ten times from three different threads. Additionally, a time-out of ten seconds guarantees that none of the threads will block on this thread forever.

More info can be found here