Parallel Test Executions in Automation – TestNG and NUnit

      One day I got an opportunity to automate an application using both Selenium Java and Selenium C#, that was the specific requirement of the customer to do it on both Java and C#. Later customer said to execute different test cases from different class in different browsers in parallel mode. Their aim was to complete the execution of all test cases in a minimum amount of time. Here, I would like to share how I achieved the parallel execution in both Selenium Java and Selenium C#.

Parallel Execution in Selenium Java Automation:

       In case of Selenium Java, I used TestNG’s parallel execution capability with support of attribute parallel=”tests” along with the tag in TestNG XML. I have created two tags to launch two different driver instances. Following is the sample testng.xml which I used for parallel execution:

<suite name="TestSuite" parallel="tests" preserve-order="true">
<test name="Test In Google Chrome">
<parameter name="browserName" value="Chrome"/>
<classes>
<class name="com.test.TestSuiteClassSmoke"/>
</classes>
</test>
<test name="Test In Firefox">
<parameter name="browserName" value="Firefox"/>
<classes>
<class name="com.test.TestSuiteClassSanity"/>
</classes>
</test>
</suite>

      In the above testng.xml file, contains one test to run all the test cases of the Smoke Suite in Google Chrome browser and the second test to run all the test cases of the Sanity Suite in Firefox. Both browser instances are start same time and execute in parallel. TestSuiteClassSanity and TestSuiteClassSmoke classes extends AutomationBase class to get the driver instances for execution. Following is the actual implementation of AutomationBase class:

@BeforeClass()
@Parameters({"browserName"})
public void SetUp(String browserName) throws IOException, InterruptedException
{
try {
if(browserName.equalsIgnoreCase("chrome")){
// implement code to start chrome driver session
}
else if(browserName.equalsIgnoreCase("firefox")){
// implement code to start firefox driver session
}
}catch (Exception e) {
e.printStackTrace();
}
}

Parallel Execution in Selenium C# Automation:

      In case of Selenium C#, there is no direct capability like TestNG to achieve the parallel execution of test cases in different instances of browsers. I used NUnit attributes just above in all test classes and that test class extends AutomationBase class. Used following NUnit attributes:

• [TestFixture(“chrome”)]
• [TestFixture(“firefox”)]
• [Parallelizable]

        Added a parameterized constructor (the parameter should be browserName) and call StartBrowser(browserName) method inside the constructor. StartBrowser (browserName) method is implemented in AutomationBase class. Following is the sample implementation that I have done in the test class:

using NUnit.Framework;
namespace com.test.testcases
{
[TestFixture("chrome")]
[TestFixture("firefox")]
[Parallelizable]
public class TestModuleClass: AutomationBase
{
public TestModuleClass(string browserName)
{
StartBrowser(browserName);
}

[Test, Order(1)]
public void TC_001_SampleTest()
{
//Your test steps
}
}
}

    In AutomationBase class, I have added new method StartBrowser(String browserName) to identify the requested browser for execution and implemented the logic to drive chrome and firefox drivers. Following is the implementation of StartBrowser,

public IWebDriver StartBrowser(String browserName)
{
try
{
if (browserName.ToLower().Equals(""))
{
throw (new Exception("BROWSER_NAME is not specified"));
}
if (browserName.ToLower().Equals("chrome"))
{
// implement code to start chrome driver session
}
if (browserName.ToLower().Equals("firefox"))
{
// implement code to start firefox driver session
}
}
catch (Exception e)
{
throw (e);
}
return driver;
}

     You can try above mechanisms of parallel executions in automation for both Selenium Java and Selenium C#.

make it perfect !