Limit the number of scenario to run in parallel - testng - cuccumber - selenium

Question

Thanks in advance.
I had create an UI BDD framework and using testNG as a runner.
Problem I am facing is , I have 3 feature file with in total 12 scenario so far , so when I run in parallel , 12 browser open up , because of which I am getting timeout exception , I tried to search entire www , and done changes in my pom file but still same.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${maven.surefire.version}</version>
<configuration>
<includes>
<include>**/ParallelRun.java</include>
</includes>
<parallel>classes</parallel>
<threadCount>4</threadCount>
<perCoreThreadCount>false</perCoreThreadCount>
<forkCount>3</forkCount>
</configuration>
</plugin>
Runner Class
public class ParallelRun extends AbstractTestNGCucumberTests {
#Override
#DataProvider(parallel = true)
public Object[][] scenarios() {
return super.scenarios();
}
}

Answer 1

I believe that the core of your problem is not in surefire config but in your tests.
Anyway I would rework your configuration to be (which has to limit your threads to 3)
<configuration>
<includes>
<include>**/ParallelRun.java</include>
</includes>
<properties>
<property>
<name>dataproviderthreadcount</name>
<value>3</value>
</property>
</properties>
</configuration>
According to cucumber documentation you need to have parallel=classes only if you have several test runners.
Forks are also not applicable here. According to surefire plugin doc forks with parallel=classes do not make sense since forks themselves process classes in parallel.

Answer 2

Scenarios will be executed in parallel, so please decrease your thread count to 1.
<threadCount>1</threadCount>
if you are using TDD, use thread count.
if you are using BDD via
cucumber file, do not use thread count - set as 1 thread count.