Tester Interview Questions

Tester Interview Questions: Testers can perform several important roles in development. You need to understand what makes them tick to get the best out of them. Asking questions will help you determine if they’re an ideal candidate for your team and whether you should keep them on or let them go.

Testers are essential for every software development team. Without them, developers cannot complete their projects, and the product may suffer from bugs or other technical issues. To become a good tester, you must know how to perform different types of testing.

What Is A Functional Tester?

A functional tester is a professional responsible for testing software applications to ensure that they function as intended and meet the requirements and expectations of end-users. Functional testing involves evaluating the features and functions of the software system, identifying and reporting defects or issues, and verifying that the system is performing correctly.

A functional tester uses various tools, techniques, and methodologies to plan, design, execute, and report on tests and works closely with developers and other stakeholders to ensure the software is high quality and meets the desired outcomes.

A functional tester must understand software development, testing principles, and testing tools. They also must have excellent analytical, communication, and problem-solving skills.

Automation Tester Interview Questions

• Tell me about yourself.
• What are your Roles and Responsibilities?
• What is the architecture of your current application?
• Which Automation framework are you using in your organization? Can you tell me the folder structure and flow of your framework?

Software Tester Interview Questions Java

• Types of polymorphism
• Methods that cannot be overloaded
• Encapsulation and common use cases
• Inheritance in java
• Methods that cannot be overloaded
• Typecasting in java
• Why string is immutable in Java
• How to handle exceptions
• Can I write try-catch without the catch block?
• Use of iterator in Java
• Increment and decrement operation
• Variable Args
• Issues during Switch case without a break
• Base class of all classes in Java
• Base class of error and exceptions
• Access specifiers
• Can the main method return any value
• Can we overload the main method? What happens when overloaded
• How to execute and statement before the main method
• Can the user declare the constructor as the final
• Can we cast any other type to Boolean data with typecasting?
• Does Java compile if the user uses ‘static public void’ instead of ‘public static void’
• Can we use this() and super() in a constructor
• Can we create the object of abstract class
• Can we create a reference for an abstract class
• Can we declare a class as static
• What is the instanceOf keyword?
• What’s the load factor of HashMap
• How to prevent a class from being subclasses
• A final variable, final method, and final class
• Ways to create a string variable.
• What is gc() – garbage collector
• Subclass and inner-class
• Infinite loop in Java
• How to make a copy of an element
• Why is String immutable in Java?
• What is static in Java?
• What is final in Java?
• What is this word in Java?
• What is finally, and where do we use it?
• What is an abstract modifier?
• Primitives and Non-Primitives datatypes in Java? Is the string primitive or non-primitive?
• What is the method of overloading?
• Why is it important to override HashCode() when you override equals()?
• How to define a dynamic array?
• Can we create the object for the abstract classes?
• Can we create the object for an interface?
• Can we create a constructor of the abstract class?
• Can the constructor be overloaded? Explain why?
• Can the main method be overloaded?
• Can the main method be overridden?
• Can we override the static method?
• Can we overload the static method?
• Can we write non-abstract methods in Interface?
• Can we execute a Java program without the main method?
• Can we call a non-static variable in the static method?
• Can I execute multiple catch blocks without try? Will it give me a compile time error?
• How to achieve serialization and deserialization?
• If we declare the main method as private, what will happen?
• How to check whether the array is empty or null?
• What are the classes available in a list interface?
• What is the use of a constructor in Java?
• What is Hashmap? Can we store objects in Hashmap, and how to retrieve them?
• Where did you use HashMap in your project and also oops concepts in your Automation Framework?
• Access modifiers in Java and its scope?
• What is meant by Thread?
• What is a singleton class in Java?
• Is the Hashmap thread safe?
• What is static? How to set the value of the static variable
• Can we overload private methods?
• Is it possible to extend the Final Class?
• Is it possible to override the Static method?
• Is it possible to overload the main method?
• Is it possible to initialize a variable present in an Interface?
• What would happen if multiple inheritances were possible in Java?
• Explain the Exceptions hierarchy in Java.
• Explain Set and Map in Java.
• Explain Inheritance.
• What is polymorphism?
• How and when to use the interface?
• Can we instantiate an interface?
• Can we overload the main method in Java?
• Can we override the constructor?
• Where do you use polymorphism in Java?
• What is the system.out.println? And the use of it?
• Why do we use finally and how does it differ from the final keyword?
• Can we use multiple catches? When can we use multiple catches?
• Different between POI and JXL?
• How can the override method in Java be prevented?
• Why is the main method static?
• What is the use of static variables?
• How will you access the default and protected classes?
• Why is Object creation not possible in Abstract classes?
• Design pattern in JAVA.
• What do All of the classes in the Java Collection Framework have?
• Situations when we use abstraction and Interface – explanation about loosely coupled and tightly coupled
• Will Java provide a default constructor on its own? How
• In which situation should the method be static, and when nonstatic?
• How is HashMap implemented using a key-value pair?
• Suppose you have a class and an abstract class in class. There is a user-defined constructor and main method. Which one will get executed first?
• What do you mean by POJO? Why do we use POJO?
• Class A has 3 methods. Class B has 2 methods and class B inherited class A. How do you call the method of class A by creating an object of class B?

QA Tester Interview Questions Java Collection

• Classes inside List interface, Set interface, Map Interface
• Which class of List Interface to be used if the user has more insertions and deletions
• Which class of List Interface to be used if the user has more retrieval
• Set Interface: HashSet, TreeSet, SortedSet
• Map – HashMap, HashTable, TreeMap, LinkedHashMap.
• How to maintain insertion order in Set, List, and Map
• How to sort elements in ascending order in Set and Map

Functional Tester Interview Questions Java Programs

• String reverse
• String Palindrome
• String Anagram
• Find occurrences of characters in a string
• Find the count of Capital and Small letters in a string
• Remove duplicate characters from a string
• Swap to numbers without a temporary variable
• Reverse number
• factorial
• Fibonacci
• Count numbers, alphabet, and special characters
• Swap string without 3rd variable?
• Duplicates in a String?
• How to find the length of the string without using length?
• Largest Number in an Array?
• Reverse string without using reverse function
• Write code to print the Fibonacci series.
• Write code to print only the even numbers from an array.
• Write code to find the special characters, numbers, capitals, and small letters in a given string.
• Write code to check if a number is a palindrome.
• Write a code to reverse the code without using the built-in method.
• Write a Java code to identify whether the pair of strings is an Anagram.
• Write a code to get the Highest number using an array.
• Given a string = “123AM256CD”, print 2 output strings, one for all the numbers and one for strings. Provide 2 ways. (Asked for the exact code) Given an integer = 123, could you give me the possible combinations? like 123,132,231,312.

Selenium Web Tester Interview Questions

• Navigation methods in selenium
• What is POM
• Implicit wait
• Explicit wait- use of explicit wait, how to ignore exceptions using explicit wait
• Fluent wait
• Examples of expected conditions in explicit wait
• The default timeout of pageLoadTimeout.
• Use of desired capabilities
• Use of chromeOptions, firefoxOptions, ieOptions, etc.
• How to disable notification in selenium.
• How to extract CSS property value
• How to handle dropdown elements with and without a select tag.
• How to handle frames and windows
• How do you switch back to the parent window?
• How to perform page scroll in Selenium
• Use of Robot keys
• Use of AutoIt
• Use of Sikuli
• How to perform File Upload
• How to click or send value to an element without using element.click() and element.sendKeys()
• Relative and absolute XPath
• Explain a few XPath functions
• How to login to a site showing an authentication popup in Selenium
• Mention a few selenium exceptions.
• What are the scenarios that cannot be automated using selenium?
• How to perform right click on selenium.
• Action class and its methods.
• Use of HtmlUnit driver
• Can we create an object of the WebDriver() in Selenium?
• What is a stale element exception, and how to handle it?
• What are the challenges you have faced during testing?
• What strategies did you follow while building a selenium framework from scratch?
• Where do you perform the singleton design pattern? If you don’t use it, do you know about this?
• Pros and cons of Implicit wait and Explicit wait.
• Why do we prefer explicit wait instead of fluent wait? What are the disadvantages of fluent wait?
• Without implicit wait, will the selenium script work or not?
• What is the default polling time for explicit and implicit wait?
• Explain synchronization in selenium.
• Which concept have they implemented in explicit and fluent wait?
• Explain the abstraction and interface with respect to selenium with some examples.
• What are page object and page factory models?
• Have you used interfaces in your framework other than selenium interfaces?
• How do you achieve inheritance in your framework?
• What is Webdriver? Name methods that have not been implemented.
• What are the methods present in the webdriver interface?
• What’s the fastest locator in Selenium?
• What does:: ( doubles colon ) in sibling XPaths represent?
• Explain. “Driver.manage.window.maximize” (talk about option interface here)
• How would you check the broken links on the webpage?
• The return type of findelement and findelements?
• What error will be thrown when no element is found for findelement and findelements?
• State some exceptions which you have faced in your framework. (Don’t mention only selenium. Explain. Explain Java exception also)
• What are the types of exceptions, and how do you handle stale element exceptions?
• What is the interface used in selenium?
• Where do you use inheritance in selenium?
• How do you initialize web elements in POM? What error or exception will come if not initiated?
• If both wait for the implicit and explicit method, as mentioned in the script, which works? Is it good practice to mention both in good?
• How do you handle Alert in Selenium?
• In a web page, there are several Pop-up, but we don’t when the pop-up appears, in this case how we will handle the Pop-up using Selenium WebDriver (Java)
• How do you handle file upload when the type attribute does not file for upload web element?
• How do we cover character keyboard operation from the context menu utilizing user-defined keywords?
• Consider this snippet driver driver=new chromedriver(); What does the above code snippet mean?
• Where can “Dynamic Polymorphism” in Selenium WebDriver be observed?
• How do you identify an object if proper Xpath, CssSelector, and ID are unavailable?
• Attributes of CSS Selector?
• Which is faster, XPath or CSS?
• How to get the n-th element using XPath and CSS?
• Considering you are only allowed to use CSS locators, how will you find the parent or grandparent of a web element?
• Will driver.findelements() throw an exception?
• What is returned by driver().manage()?
• In Selenium, if you want to access the element with the text “This element has an ID that changes every time the page is loaded” in it, then which of the following will you use?
• On page Object Model Framework (POM), how do you initialize the elements of a page to be used in the runner class? (The name of the PageObjects class is “SignupPage.java” and the driver object name is “driver”).
• Get the values from the dropdown and print them in Ascending order
• Using TreeSet to find elements command
• Does it take a screenshot of its interface or class
• Selenium uses lots of third-party jars for scripting. Then why do we still go for selenium?
• Why do we have to use the build() and perform() with the action object
• Can we use perform() along in scripting without build()
• The return type of getwindowhandle() and getwindowhandles()?
• Window Handling in Selenium -Switching from another window to a Parent window
• Is the button disabled? How to check -using getattribute()
• Explain method overloading with selenium and some example
• How do you read Excel in the script? (very careful while answering. the counter-question will come as per your answer)
• Do you use the property file in your framework? If yes, then which java concept gets utilized here? (Java Collection)
• On a web page, there are several Pop-up, but we don’t when the pop-up appears, in this case how we will handle the Popup using Selenium WebDriver (Java)
• I started automation test suite execution, and a few test cases failed in a test run. How can you execute only failed test cases simultaneously (with one click)? What design pattern do we use when we trigger different browsers?
• What are approaches to handle dynamic WebElement?
• Click the last option in the dropdown (The last drop-down changes dynamically)
• How to calculate links on a page? (Answer with HTML tag)
• Write the code to read the value from the Excel sheet.
• What is Page Factory in the POM Design pattern?
• If your application has 10 pages, how do you achieve POM? What will you do?
• Annotation used in Page Object Model?
• Ways to find broken links in Selenium?
• How to handle frame in Selenium?
• How to handle Alerts in Selenium?
• Different types of Navigation Commands?
• How to download a file using Selenium?
• How do you manage a set of Data Tables in Selenium?
• How do you automate localization testing for different languages in UI?
• How can you avoid NoSuchElementException without using try/catch block and with try/catch block?
• How to handle web tables whose values change dynamically?
• How to check whether a web element is enabled or Disabled without using the isEnabled method?
• Why is CSS locator faster than Xpath?
• Even though CSS is faster than Xpath, why do 95% of the companies use XPath?
• Error is throwing as Element not found, but when I check, that element is available on the web page. The element is not hidden, so there is no need to use a Java script executor. How do you solve this?
• How do you execute using headless mode?
• In Selenium, how to get text value from the text box if gettext() is not working?
• How will you resolve this error if we are using the correct locator but still getting an element that is not found?
• In the Page object model, once you create the loginpage.java class, what is the first thing you start with writing initially? How are you initiating writing something into a page class?
• What if a Windows popup occurs during test execution, preventing automated test execution? How will you resolve this error?
• Different ways to handle hidden elements?
• Is it possible to change the behavior of a test at runtime?
• Describe how to handle the below items using selenium -iframe -windows -table -Alerts
• How do click the right click of a mouse?
• How to scroll down a page?
• What will driver.getWindowHandels() return?
• How will you automate Windows-based applications?

REST API

• What are the Client/server Error Codes?
• What are success status codes?
• What is the use of GET, PUT, POST, PATCH, DELETE
• How to handle authentication?
• What is a Webserver vs. API server?
• JSON/XML structure format
• How to validate JSON response
• Use of JsonPath
• How do you construct a JSON body for the Put, Post, and Patch requests?
• Use of JsonObject.
• What is URI
• What’s a resource
• What are the common headers used?
• Common content types

GIT

• Use common commands: add, status, commit, push, pull, restore, checkout, and clone.
• What is a merge conflict in git, and how can it be resolved?
• How do merge issues occur in git?

Cucumber

• What are the keywords used inside CucumberOptions?
• What are Cucumber tags used for Andd/OR operation?
• What are the annotations in Cucumber?
• What is the sequence of Cucumber annotations?
• What is the use of background keywords in cucumber?
• What are keywords in BDD?
• How do you do a single line and multiline comment in Cucumber?
• How do you pass parameters in BDD cucumber?
• How do you use scenario outlines and examples in Cucumber?
• What is dataTable
• Can we have multiple scenario outlines in a feature file?

Conclusion:

In conclusion, tester interview questions are essential for assessing a candidate’s skills, experience, and fit for the role. Asking the right questions can help the interviewer evaluate the candidate’s technical knowledge, problem-solving skills, communication abilities, and teamwork capabilities. Through a well-designed interview process, the organization can identify the best candidate to contribute to the team’s success and help ensure the software’s quality.

If you have any additional questions or experiences related to tester interview questions, please share them in the comments section. Sharing insights and experiences can help others in the community better understand the interview process and improve their skills as interviewers or candidates.