Run same Selenium/Testng tests concurrently - selenium

Question

I have a selenium test which tests my target web application.
I want to run the same test on Jenkins concurrently on Nightly and Staging environments.
What is the better way to do that? I am ok to approach it on Jenkins or on Selenium Grid or any other way.
I explored Selenium Grid but they talk of executing different tests parallel on multiple envs. But my specific requirement is that I have to run SAME TEST CONCURRENTLY on the same browser instance or on different browser instance.
Ex: Consider this test, com.myorg.myapp.myTest.testLogin(String envURL)
I would like to run this test concurrently on Chrome (for ex) by passing Nightly and Staging URLs.
At present I am running first set of tests on Nightly followed by the same tests on Staging. This takes almost a day. I need to do them concurrently to save time.

Answer 1

You can create a testNG xml and add the same test to different suites likes this.
<suite name="mySuite" parallel="tests">
<test name="thread1">
<classes>
<class name="test.sample.MyTest"/>
</classes>
</test>
<test name="thread2">
<classes>
<class name="test.sample.MyTest"/>
</classes>
</test>
...
...
<test name="threadN">
<classes>
<class name="test.sample.MyTest"/>
</classes>
</test>
</suite>
If you need to pass the environment add the following and access it from the code of a test as described here (http://testng.org/doc/documentation-main.html#parameters)
<parameter name="env" value="staging"/>
This is a simple solution yet quite ugly and harder to maintain if you need a lot of threads. Another way is to create your XML in code by implementing IAlterSuiteListener. See TestNG Parallel execution with selenium for the code sample.