Questions asked in Selenium Interviews

How to exclude a particular test method from a test case execution?

We can exclude a particular testcase by adding the exclude tag in the testng.xml or by setting enabled attribute to false

							  <class name="TestCaseName">
								   <exclude name="TestMethodNameToExclude"/>

Check If An Element Exists?

You may need to perform a action based on a specific web element being present on the web page.
You can use below code snippet to check if a element with id 'element-id' exists on web page.

                        				System.out.println("Element exists");
                        			System.out.println("Element donot exists");

What is TestNG?

TestNG is a testing framework designed to simplify a broad range of testing needs, from unit testing to integration testing.

Explain what are the basic steps required in writing TestNG tests?

1. Write down the business logic of your test and insert TestNG annotations in your code 2. In a build.xml or testing.xml, add the information about your test 3. Run TestNG

What are the annotations available in TestNG?

  • @BeforeTest
  • @AfterTest
  • @BeforeClass
  • @AfterClass
  • @BeforeMethod
  • @AfterMethod
  • @BeforeSuite
  • @AfterSuite
  • @BeforeGroups
  • @AfterGroups
  • @Test

How to create and run testng.xml ?

In TestNG framework, we need to create testng.xml file to create and handle multiple test classes. We do configure our test run, set test dependency, include or exclude any test, method, class or package and set priority etc in the xml file.

What is the 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

What is TestNG Assert and list out common TestNG Assertions?

TestNG Asserts help us to verify the condition of the test in the middle of the test run. Based on the TestNG Assertions, we will consider a successful test only if it is completed the test run without throwing any exception. Some of the common assertions supported by TestNG are 1. assertEqual(String actual,String expected)

2. assertEqual(String actual,String expected, String message)

3. assertEquals(boolean actual,boolean expected)

4. assertTrue(condition)

5. assertTrue(condition, message)

6. assertFalse(condition)

7. assertFalse(condition, message)

What is Soft Assert / Verify in TestNG?

Soft Assert collects errors during @Test. Soft Assert does not throw an exception when an assert fails and would continue with the next step after the assert statement.

If there is any exception and you want to throw it then you need to use assertAll() method as a last statement in the @Test and test suite again continue with next @Test as it is.

What is Hard Assert in TestNG?

Hard Assert throws an AssertException immediately when an assert statement fails and test suite continues with next @Test

What is exception test in TestNG?

TestNG gives an option for tracing the Exception handling of code. You can verify whether a code throws the expected exception or not. The expected exception to validate while running the test case is mentioned using the expectedExceptions attribute value along with @Test annotation.

How to set test case priority in TestNG?

We use priority attribute to the @Test annotations. In case priority is not set then the test scripts execute in alphabetical order

									import org.testng.annotations.*;
									public class PriorityTestCase{
										public void testCase1() {											
											system.out.println("Test Case 1");
										public void testCase2() { 	 
											system.out.println("Test Case 2");

How to run test cases in parallel using TestNG?

we can use “parallel᾿ attribute in testng.xml to accomplish parallel test execution in TestNG The parallel attribute of suite tag can accept four values:

tests – TestNG will run all the methods in the same tag in the same thread, but each tag will be in a separate thread. This allows you to group all your classes that are not thread safe in the same and guarantee they will all run in the same thread while taking advantage of TestNG using as many threads as possible to run your tests.

classes – TestNG will run all the methods in the same class in the same thread, but each class will be run in a separate thread.

methods – TestNG will run all your test methods in separate threads. Dependent methods will also run in separate threads but they will respect the order that you specified.

instances – TestNG will run all the methods in the same instance in the same thread, but two methods on two different instances will be running in different threads..

the attribute thread-count allows you to specify how many threads should be allocated for this execution.

							<suite name="Regression" parallel="methods">

How to disable a test case in TestNG ?

To disable the test case we use the parameter enabled = false to the @Test annotation.

						@Test(enabled = false)


How to Ignore a test case in TestNG?

To ignore the test case we use the parameter enabled = false to the @Test annotation.

						@Test(enabled = false)


Type Casting in Method Overloading in Java Selenium

what are @Test attributes ?

  • @Test - Marks a class or a method as part of the test.
  • alwaysRun - If set to true, this test method will always be run even if it depends on a method that failed.
  • dataProvider - The name of the data provider for this test method.
  • dataProviderClass - The class where to look for the data provider. If not specified, the data provider will be looked on the class of the current test method or one of its base classes. If this attribute is specified, the data provider method needs to be static on the specified class.
  • dependsOnGroups - The list of groups this method depends on.
  • dependsOnMethods - The list of methods this method depends on.
  • description - The description for this method.
  • enabled - Whether methods on this class/method are enabled.
  • expectedExceptions - The list of exceptions that a test method is expected to throw. If no exception or a different than one on this list is thrown, this test will be marked a failure.
  • groups - The list of groups this class/method belongs to.
  • invocationCount - The number of times this method should be invoked.
  • invocationTimeOut - The maximum number of milliseconds this test should take for the cumulated time of all the invocation counts. This attribute will be ignored if invocationCount is not specified.
  • priority - The priority for this test method. Lower priorities will be scheduled first.
  • successPercentage - The percentage of success expected from this method
  • singleThreaded - If set to true, all the methods on this test class are guaranteed to run in the same thread, even if the tests are currently being run with parallel="methods". This attribute can only be used at the class level and it will be ignored if used at the method level. Note: this attribute used to be called sequential (now deprecated).
  • timeOut - The maximum number of milliseconds this test should take.
  • threadPoolSize - The size of the thread pool for this method. The method will be invoked from multiple threads as specified by invocationCount. Note: this attribute is ignored if invocationCount is not specified.

What is the time unit we specify in test suites and test cases?

We specify the time unit in test suites and test cases is in milliseconds.

List out the advantages of TestNG over Junit?

  • Compare to JUnit annotations, TestNG are easy to understand
  • Unlike JUnit, TestNG does not require to declare @BeforeClass and @AfterClass
  • Method name constraint is not there in TestNG
  • TestNG allows you the grouping of test cases easily which is not possible in JUnit
  • TestNG supports following three additional setup: @Before/AfterSuite, @Before/AfterTest and @Before/AfterGroup
  • TestNG does not need to extend any class
  • In TestNG, it is possible to run selenium test cases in parallel
  • Based on group TestNG allows you to execute the test cases
  • TestNG allows you to determine the dependent test cases; each test case is autonomous to other test case

Explain what is Time-Out test in TestNG?

The Time-Out test in TestNG is nothing but time allotted to perform unit testing. If the unit test fails to finish in that specific time limit, TestNG will abandon further testing and mark it as a failed.

How to write regular expression in testng.xml file to search @Test methods containing "product" keyword.

Regular expression to find @Test methods containing keyword "product" Is as bellow.

															     <include name=".*product.*"/>

Explain what is exception test?

TestNG gives option for tracing the Exception handling of code. You can test whether a code throws the expected results or not. The expectedExceptions parameter is availed along with @Test annotation.

Explain what is parametric testing?

Parameterized testing allows developers to execute the same test over and over again using different values. In two different ways TestNG allows you to pass parameters directly to your test methods. 1. With testng.xml 2. With Data Providers

Explain how can you run the JUnit tests using TestNG?

You can run the JUnit tests using TestNG by 1. Placing JUnit library on the TestNG classpath, so it can locate and use JUnit classes

2. Change your test runner from JUnit to TestNG in Ant and then run TestNG in “mixed mode᾿ . This will bring all your test in the same

3. This approach also enables you to convert your existing JUnit test to TestNG

What does @Test(invocationCount=?) and (threadPoolSize=?) indicates?

@Test (threadPoolSize=?): The threadPoolSize attributes tell TestNG to form a thread pool to run the test method through multiple threads. With threadpool, the running time of the test method reduces greatly.

@Test(invocationCount=?): The invocationcount tells how many times TestNG should run this test method

Mention different ways in which you can produce reports for TestNG results?

There are two ways to produce a report with Test NG, they are

Listeners: For a listener class to implement, the class has to implement the org.testng./TestListener interface. These classes are informed at runtime by TestNG when the test begins, finsishes, skips, passes or fails.

Reporters: For a reporting class to implement, the class has to implement an org.testng/Reporter interface. When the whole suite run ends, these classes are called. When called, the object consisting the information of the whole test run is delivered to this class.

How to pass parameter with testng.xml file to use It In test case?

We can define parameter in testng.xml file using syntax like bellow.

                        		<parameter name="browser" value="FFX" />

Here, name attribute defines parameter name and value defines value of that parameter. Then we can use that parameter In selenium test case using bellow given syntax.

                        		@Parameters ({"browser"})

Explain in what ways does TestNG allows you to specify dependencies?

TestNG allows you to specify dependencies in two ways

1. Using attributes dependsOnMethods in @Test annotations

2. Using attributes dependsOnGroups in @Test annotations

Ways to select dropdown option in selenium

What is the default priority of test cases in TestNG?

The default priority of test when not specified is integer value 0. So, if we have one test case with priority 1 and one without any priority then the test without any priority value will get executed first .

What is difference between @Factory and @DataProvider annotation?

@Factory method creates instances of test class and run all the test methods in that class with different set of data.

Whereas, @DataProvider is bound to individual test methods and run the specific methods multiple times.

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Comment / Suggestion Section
Point our Mistakes and Post Your Suggestions
  • Sudeeksha
    Hi, can you please add examples to how we can pass parameters to the test cases or to prioritize test cases through testng.xml file.
    Also, for Hard Assertions: Test execution stops as soon as assertion failure found. Kindly modify the same.
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