TestNG Interview Questions


TestNG Interview Questions







1. What is TestNG?
TestNG is a testing framework designed to simplify a broad range of testing needs, from unit testing to integration testing. For more information.

2. What are the advantages of TestNG?
·      TestNG provides parallel execution of test methods
·      It allows to define dependency of one test method over other method
·      It allows to assign priority to test methods @Test(priority=1, groups = “Login”)
·      It allows grouping of test methods into test groups
·      It has support for parameterizing test cases using @Parameters annotation
·      It allows data driven testing using @DataProvider annotation
·      It has different assertions that helps in checking the expected and actual results
·      Detailed (HTML) reports
·      Testng Listeners


3. What are the annotations available in TestNG?
@BeforeTest
@AfterTest
@BeforeClass
@AfterClass
@BeforeMethod
@AfterMethod
@BeforeSuite
@AfterSuite
@BeforeGroups
@AfterGroups
@Test
@DataProvider
@Parameters


4. Can you arrange the below testng.xml tags from parent to child?

<test>
<suite>
<class>
<methods>
<classes>

The correct order of the TestNG tags are as follows
<suite>
<test>
<classes>
<class>
<methods>



5. 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.




6. 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



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.
x
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.
// 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. 
<parameter name="browser" value="firefox"/>
Here, name attribute represents the parameter name and value represents the value of that parameter.


8. 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

   assertEqual(String actual,String expected)
   assertEqual(String actual,String expected, String message)
   assertEquals(boolean actual,boolean expected)
   assertTrue(condition)
   assertTrue(condition, message)
   assertFalse(condition)
   assertFalse(condition, message)


9. What is Soft Assert 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.


T1(){
1 sendkeys()
2 HA –passed à 3 else à terminate test case / failed
3 SA -- passed
4 SA  --- failed à 5
5 SA – passed à 6
6 SA – Failed

softAssert.assertAll();



}




10. What is Hard Assert in TestNG?
Hard Assert throws an AssertException immediately when an assert statement fails and test suite continues with next @Test


11. 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.

@Test
t1(expectedExceptions = ElementNotFoundException){

}




12. 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.
// TestNG Interview Questions
package TestNG;
import org.testng.annotations.*;
public class PriorityTestCase{
           
@Test(priority=0)
            public void testCase1() { 
                        system.out.println("Test Case 1");
            }
           
@Test(priority=1)
            public void testCase2() {          
                        system.out.println("Test Case 2");
            }
}
Output:
Test Case 1
Test Case 2


13. What is Parameterized testing in TestNG?
Parameterized tests allow developers to run the same test over and over again using different values.
There are two ways to set these parameters:
   using testng.xml – Practical Example
   using Data Providers – Practical Example


14. How can we create data driven framework using TestNG?
By using @DataProvider annotation,  we can create a Data Driven Framework.


// TestNG Interview Questions
@DataProvider(name="getData")
            public Object[][] getData(){
                        //Object [][] data = new Object [rowCount][colCount];
                        Object [][] data = new Object [2][2];
                       
                        data [0][0] = "FirstUid";
                        data [0][1] = "FirstPWD";
                       
                        data[1][0] = "SecondUid";
                        data[1][1] = "SecondPWD";
                       
                        return data;
                       
            }





15. How to run a group of test cases using TestNG?
TestNG allows you to perform sophisticated groupings of test methods. Not only can you declare that methods belong to groups, but you can also specify groups that contain other groups. Then TestNG can be invoked and asked to include a certain set of groups (or regular expressions) while excluding another set.  This gives you maximum flexibility in how you partition your tests and doesn’t require you to recompile anything if you want to run two different sets of tests back to back.
Groups are specified in your testng.xml file and can be found either under the <test> or <suite> tag. Groups specified in the <suite> tag apply to all the <test> tags underneath.

@Test (groups = { "smokeTest", "functionalTest" })
public void loginTest(){
System.out.println("Logged in successfully");
}



16. How to create Group of Groups in TestNG?
Groups can also include other groups. These groups are called MetaGroups. For example, you might want to define a group all that includes smokeTest and functionalTest. Let’s modify our testng.xml file as follows:

<groups>
   <define name="all">
             <include name="smokeTest"/>
             <include name="functionalTest"/>
   </define>
   <run>
         <include name="all" />
   </run>       
</groups>


17. 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 – All the test cases inside <test> tag of testng.xml file will run parallel
classes – All the test cases inside a java class will run parallel
methods – All the methods with @Test annotation will execute parallel
instances – Test cases in same instance will execute parallel but two methods of two different instances will run in different thread.
<suite name="softwaretestingmaterial" parallel="methods">



18. How to exclude a particular test method from a test case execution? 
By adding the exclude tag in the testng.xml
<classes>
  <class name="TestCaseName">
     <methods>
       <exclude name="TestMethodNameToExclude"/>
     </methods>
  </class>     
</classes>

19. How to exclude a particular test group from a test case execution? 
By adding the exclude tag in the testng.xml
<groups>
    <run>
             <exclude name="TestGroupNameToExclude"/>
    </run>     
</groups>


20. 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)


21. How to skip a @Test method from execution in TestNG?
By using throw new SkipException()






Once SkipException() thrown, remaining part of that test method will not be executed and control will goes directly to next test method execution.
throw new SkipException("Skipping - This is not ready for testing ");


22. 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)




23. How TestNG allows to state dependencies?
TestNG allows two ways to declare the dependencies.
Using attributes dependsOnMethods in @Test annotations – Practical ExampleUsing attributes dependsOnGroups in @Test annotations – Practical Example




24. What are the different ways to produce reports for TestNG results?
TestNG offers two ways to produce a report.
Listeners implement the interface org.testng.ITestListener and are notified in real time of when a test starts, passes, fails, etc…
Reporters implement the interface org.testng.IReporter and are notified when all the suites have been run by TestNG. The IReporter instance receives a list of objects that describe the entire test run.



25. What is the use of @Listener annotation in TestNG?
TestNG listeners are used to configure reports and logging. One of the most widely used listeners in testNG is ITestListener interface. It has methods like onTestStart, onTestSuccess, onTestFailure, onTestSkipped etc. We should implement this interface creating a listener class of our own. Next we should add the listeners annotation (@Listeners) in the Class which was created.




26. How to write regular expression In testng.xml file to search @Test methods containing “smoke” keyword.

Regular expression to find @Test methods containing keyword “smoke” is as mentioned below.
<methods>
     <include name=".*smoke.*"/>
</methods>




27. 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.



28. List out various ways in which TestNG can be invoked?
TestNG can be invoked in the following ways
   Using Eclipse IDE
   Using maven/ant build tool
   From the command line
   Using IntelliJ’s IDEA









29. How To Run TestNG Using Command Prompt?

C: test
Java c://testing.jar test.java


30. What is the use of @Test(invocationCount=x)?
The invocationcount attribute tells how many times TestNG should run a test method
@Test(invocationCount = 10)
public void testCase1(){
In this example, the method testCase1 will be invoked ten times



31. What is the use of @Test(threadPoolSize=x)?
The threadPoolSize attribute tells to form a thread pool to run the test method through multiple threads.
Note: This attribute is ignored if invocationCount is not specified
@Test(threadPoolSize = 3, <code class="plain">invocationCount = </code><code class="value">10</code>) public void testCase1(){
In this example, the method testCase1 will be invoked from three different threads


32. What does the test timeout mean in TestNG?
The maximum number of milliseconds a test case should take.
@Test(threadPoolSize = 3, invocationCount = 10,  timeOut = 10000)
public void testCase1(){
In this example, the function testCase1 will be invoked ten times from three different threads. Additionally, a time-out of ten seconds guarantees that none of the threads will block on this thread forever.



33. What are @Factory and @DataProvider annotation?
@Factory: A factory will execute all the test methods present inside a test class using a separate instance of the respective class with different set of data.
@DataProvider: A test method that uses DataProvider will be executed the specific methods multiple number of times based on the data provided by the DataProvider. The test method will be executed using the same instance of the test class to which the test method belongs.







For any feedback, feel free to reach me. You can write to me at naveenanimation20@gmail.com

Subscribe to this channel, and press bell icon to get some interesting videos on Selenium and Automation:

Follow me on my Facebook Page:

10 comments:

  1. 9. What is Soft Assert 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.
    Practical Example


    T1(){
    1 sendkeys()
    2 HA –passed à 3 else à terminate test case / failed
    3 SA -- passed
    4 SA --- failed à 5
    5 SA – passed à 6
    6 SA – Failed

    softAssert.assertAll();



    }
    For this how can i send email with complete details of 5 th and 6th assert statement. Currently I am using
    @AfterMethod
    public void closeBrowser(ITestResult result) throws EmailException
    {

    driver.close();
    if(ITestResult.FAILURE==result.getStatus()) {
    System.out.println(result.getTestName());
    EmailPage.sendFailedEmail(ProperyReader.getProperty("ukNonMemberEmailId"), ProperyReader.getProperty("emailPassword"), ProperyReader.getProperty("sendEmailTo"),result.getName());
    }
    }
    but it sends email with just one Thing that this particular test named "Test_login" failed. not all the details of 5th and 6th

    ReplyDelete
  2. That is very interesting; you are a very skilled blogger. I have shared your website in my social networks! A very nice guide. I will definitely follow these tips. Thank you for sharing such detailed article.

    software testing course in chennai

    ReplyDelete
  3. This article is actually remarkable one it helps many new users that desire to read always the best stuff. rahul

    ReplyDelete
  4. This is very helpful for all of us . Thanks :)

    ReplyDelete
  5. This is an awesome post. Really very informative and creative contents. This concept is a good way to enhance knowledge. I like it and help me to development very well. Thank you for this brief explanation and very nice information. Well, got good knowledge.
    WordPress website development Chennai

    ReplyDelete
  6. East or West, Naveen is the Best!!!!

    ReplyDelete
  7. Someone essentially help to make seriously posts I would state. This is the very first time I frequented your web page and thus far? I surprised with the research you made to make this particular publish extraordinary. Great job! web design quotes singapore

    ReplyDelete
  8. It’s hard to seek out knowledgeable individuals on this matter, however you sound like you already know what you’re speaking about! Thanks IELTS writing

    ReplyDelete
  9. This is an awesome post. Really very informative and creative contents.
    WordPress website development Chennai

    ReplyDelete

Featured Post

Advanced Selenium Webdriver Interview Questions and Answers in Java

Advanced Selenium Webdriver Interview Questions and Answers in Java Selenium WebDriver - QA Here is the list of Selenium Inte...