Selenium TestNG Interview Questions

1.       What are the annotations used in TestNG ?

·         @Test, @BeforeSuite, @AfterSuite, @BeforeTest, @AfterTest, @BeforeClass, @AfterClass, @BeforeMethod, @AfterMethod.

2.       What is the difference between @BeforeMethod and @BeforeClass ?

·         @BeforeMethod- this will execute before every @Test method.

·         @BeforeClass- this will execute before every class.

3.       What are the different attributes for @Test annotation?

·         alwaysRun, dataProvider, dependsOnMethods, enabled, priority etc.

4.       What is return type of Data Provider?

·         Object[][]

5.       What are advantages of TestNG over Junit?

·         In Junit we have to declare @BeforeClass and @AfterClass which is a constraint where as in TestNG there is no constraint like this.

·         Additional Levels of setUp/tearDown level are available in TestNG like @Before/AfterSuite,@Before/AfterTest and @Before/AfterGroup

·         No Need to extend any class in TestNG.

·         There is no method name constraint in TestNG as in Junit. You can give any name to the test methods in TestNG

·         In TestNG we can tell the test that one method is dependent on another method where as in Junit this is not possible. In Junit each test is independent of another test.

·         Grouping of test cases is available in TestNGwhere as the same is not available in Junit.

·         Execution can be done based on Groups..

·         Also using TestNG your selenium testcase execution can be done in parallel

6.       I'm running testng.xml with group name. Before/AfterClass is not running?

·         When you specify a group to run, any method that is not part of this group will not be run.  Since @BeforeClass/@AfterClass do not belong to that group, they are not being run.

·         The way to fix this is to put these methods in that group or to use alwaysRun=true

7.       What is the difference between priority and dependsOnMethods?

·         Priority is used set the sequence of execution of @Test mthods in a TestNg class

·         dependsOnMethods is used to skip test methods whenever dependent method is failed/skipped.