Importance of testng.xml file

In a Selenium TestNG project, we use testng.xml file to configure the complete test suite in a single file. Some of the features are as follows.

• testng.xml file allows to include or exclude the execution of test methods and test groups
• It allows to pass parameters to the test cases
• Allows to add group dependencies
• Allows to add priorities to the test cases
• Allows to configure parallel execution of test cases
• Allows to parameterize the test cases

7. How to pass parameter through testng.xml file to a test case?

We could define the parameters in the testng.xml file and then reference those parameters in the source files.

Create a java test class, say, ParameterizedTest.java and add a test method say parameterizedTest() to the test class. This method takes a string as input parameter. Add the annotation @Parameters(“browser”) to this method.

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// TestNG Interview Questions public class ParameterizedTest { @Test @Parameters("browser") public void parameterizedTest(String browser){ if(browser.equals("firefox")){ System.out.println("Open Firefox Driver"); }else if(browser.equals("chrome")){ System.out.println("Open Chrome Driver"); } } }

The parameter would be passed a value from testng.xml, which we will see in the next step.

We could set the parameter using the below syntax in the testng.xml file. 

1	<parameter name="browser" value="firefox"/>

Here, name attribute represents the parameter name and value represents the value of that parameter.