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Top JUnit Interview Questions for Your Technical Interview

by Interview Kickstart Team in Interview Questions
October 10, 2024

Top JUnit Interview Questions for Your Technical Interview

Last updated by Vartika Rai on Sep 25, 2024 at 10:44 PM | Reading time: 7 minutes

You can download a PDF version of  
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JUnit is one of the most popular unit testing frameworks explicitly built for the Java language. It is also one of the most widely used frameworks specifically for regression testing. JUnit is part of a family of unit testing frameworks known collectively as xUnit.

If you are a developer or tester who codes in Java, you’re expected to know answers to common JUnit interview questions at technical rounds of software engineering and testing interviews. To give you an understanding of the type of questions to expect at your upcoming interview, we’ve compiled a list of top JUnit interview questions for experienced java developers and freshers.

If you are preparing for a tech interview, check out our technical interview checklist, interview questions page, and salary negotiation e-book to get interview-ready!

Having trained over 11,000 software engineers, we know what it takes to crack the most challenging tech interviews. Our alums consistently land offers from FAANG+ companies. The highest ever offer received by an IK alum is a whopping $1.267 Million!

At IK, you get the unique opportunity to learn from expert instructors who are hiring managers and tech leads at Google, Facebook, Apple, and other top Silicon Valley tech companies.

Want to nail your next tech interview? Sign up for our FREE Webinar

Let’s go ahead and look at some common JUnit interview questions asked at testing and Java developer interviews. We’ll look at JUnit interview questions for experienced developers and freshers.

Here’s what we’ll cover in this article:

  • Common JUnit Interview Questions and Answers
  • JUnit Interview Questions for Experienced Professionals
  • FAQs on JUnit Interview Questions

Common JUnit Interview Questions and Answers

Knowing answers to commonly asked JUnit interview questions is important to set yourself apart in Java developer and tester interviews. Here are a few common JUnit interview questions and answers, followed by some sample JUnit interview questions asked specifically at interviews for freshers and junior programmers.

Q1. What are some prominent advantages of using JUnit?

This is one of the most common JUnit interview questions asked at technical interviews.

Some prominent advantages of using JUnit include

  • It helps to automate test cases.
  • It allows developers to refactor code.
  • Helps to rectify logic in code when there is a deviation from optimal code
  • Helps to reduce overall testing costs

Q2. What are the core features of JUnit?

This is another common JUnit interview question asked at Java developer and tester interviews.

Some core features of JUnit include:

  • It allows developers and testers to perform regression testing
  • It provides specific annotations for identifying various test methods
  • It offers a platform that allows test cases to run automatically
  • It allows testers and developers to perform automated testing of test cases

Q3. What is the function of the @Before annotation in JUnit?

The @Before annotation in JUnit executes initialization statements and preconditions before running the particular test case.

Q4. What is the use of the @ignores annotation in JUnit?

This is one of the most common JUnit interview questions asked at technical interviews. @ingores in JUnit ignore specific conditions and initialization statements while executing test cases.

Q5. What do you understand about the @RunWith annotation?

The @RunWith annotation is used to run JUnit test cases with custom JUnit runners such as MockitoJUnitRunner, and SpringJUnit4ClassRunner. It also allows developers and testers to perform parameterized testing on the JUnit test framework.  

Sample JUnit Interview Questions for Your Upcoming Interview

In this section, we’ll look at some sample interview questions in JUnit, mostly asked at interviews for freshers.

  1. What do you understand about the @after annotation in JUnit?
  2. What do you understand about the @Type annotation in JUnit?
  3. What are Assert methods in JUnit?
  4. What do you understand by a test suite in JUnit?
  5. What do you understand by a JUnit fixture?
  6. What do you understand by Stubbing and Mocking in JUnit?
  7. How do you achieve test isolation in JUnit?
  8. Explain the process of writing a typical test case in JUnit.
  9. What is the @BeforeClass annotation in JUnit?
  10. What is the @AfterClass annotation in JUnit?

JUnit Interview Questions for Experienced Programmers and Testers

As an experienced programmer, your knowledge of JUnit and other unit testing frameworks is evaluated in Java interviews.

To give you an idea of what to expect, we’ve compiled a list of common JUnit interview questions for experienced developers.

  1. What are some best practices to follow while writing JUnit test cases?
  2. How would you run the JUnit environment from the command window?
  3. How do you test protected methods in JUnit?
  4. Explain how to assert exceptions thrown in JUnit tests
  5. What do you understand about Hamcrest Matchers in JUnit?
  6. What do you understand by cyclomatic complexity of code?
  7. What are code coverages?
  8. How do you test private methods in JUnit?
  9. Why is mocking required in Unit Testing?
  10. What is the difference between @injectmocks and @mock?
  11. How do you mock void methods in Mockito?
  12. What is the function of SPY in JUnit?

Practicing these JUnit interview questions will help you get interview-ready for your next Java developer/tester interview.

FAQs on JUnit Interview Questions

Q1. Which programming language is JUnit developed explicitly for?

JUnit is a unit testing framework specifically developed for Java. It is part of a family of unit testing frameworks known collectively as xUnit.

Q2. Where are JUnit interview questions typically asked?

JUnit interview questions are typically asked at Java developer and tester interviews. Questions are typically around the framework’s core features and functionalities.

Q4. What important topics should be prepared to answer JUnit coding interview questions?

JUnit interview questions at technical interviews are typically around JUnit test cases, annotations, methods, unit testing, regression testing, fixtures, and code coverages.

Q5. What is the average Java developer salary in the US?

The average Java developer salary in the United States is $97,343 per year, according to glassdoor.com

Gear Up for Your Next Technical Interview

Are you getting ready for your upcoming technical interview? Register for our technical interview webinarto get insightful guidance and tactics to crack technical interviews at the biggest companies.

At Interview Kickstart, we’ve trained over 11,000 engineers to land lucrative offers at the biggest tech companies. Our instructors, who are FAANG hiring managers, know what it takes to nail tough tech interviews at top technology companies.

Register for our FREE webinar to learn more.

Author
Vartika Rai
Product Manager at Interview Kickstart | Ex-Microsoft | IIIT Hyderabad | ML/Data Science Enthusiast. Working with industry experts to help working professionals successfully prepare and ace interviews at FAANG+ and top tech companies
The fast well prepared banner

JUnit is one of the most popular unit testing frameworks explicitly built for the Java language. It is also one of the most widely used frameworks specifically for regression testing. JUnit is part of a family of unit testing frameworks known collectively as xUnit.

If you are a developer or tester who codes in Java, you’re expected to know answers to common JUnit interview questions at technical rounds of software engineering and testing interviews. To give you an understanding of the type of questions to expect at your upcoming interview, we’ve compiled a list of top JUnit interview questions for experienced java developers and freshers.

If you are preparing for a tech interview, check out our technical interview checklist, interview questions page, and salary negotiation e-book to get interview-ready!

Having trained over 11,000 software engineers, we know what it takes to crack the most challenging tech interviews. Our alums consistently land offers from FAANG+ companies. The highest ever offer received by an IK alum is a whopping $1.267 Million!

At IK, you get the unique opportunity to learn from expert instructors who are hiring managers and tech leads at Google, Facebook, Apple, and other top Silicon Valley tech companies.

Want to nail your next tech interview? Sign up for our FREE Webinar

Let’s go ahead and look at some common JUnit interview questions asked at testing and Java developer interviews. We’ll look at JUnit interview questions for experienced developers and freshers.

Here’s what we’ll cover in this article:

  • Common JUnit Interview Questions and Answers
  • JUnit Interview Questions for Experienced Professionals
  • FAQs on JUnit Interview Questions

Common JUnit Interview Questions and Answers

Knowing answers to commonly asked JUnit interview questions is important to set yourself apart in Java developer and tester interviews. Here are a few common JUnit interview questions and answers, followed by some sample JUnit interview questions asked specifically at interviews for freshers and junior programmers.

Q1. What are some prominent advantages of using JUnit?

This is one of the most common JUnit interview questions asked at technical interviews.

Some prominent advantages of using JUnit include

  • It helps to automate test cases.
  • It allows developers to refactor code.
  • Helps to rectify logic in code when there is a deviation from optimal code
  • Helps to reduce overall testing costs

Q2. What are the core features of JUnit?

This is another common JUnit interview question asked at Java developer and tester interviews.

Some core features of JUnit include:

  • It allows developers and testers to perform regression testing
  • It provides specific annotations for identifying various test methods
  • It offers a platform that allows test cases to run automatically
  • It allows testers and developers to perform automated testing of test cases

Q3. What is the function of the @Before annotation in JUnit?

The @Before annotation in JUnit executes initialization statements and preconditions before running the particular test case.

Q4. What is the use of the @ignores annotation in JUnit?

This is one of the most common JUnit interview questions asked at technical interviews. @ingores in JUnit ignore specific conditions and initialization statements while executing test cases.

Q5. What do you understand about the @RunWith annotation?

The @RunWith annotation is used to run JUnit test cases with custom JUnit runners such as MockitoJUnitRunner, and SpringJUnit4ClassRunner. It also allows developers and testers to perform parameterized testing on the JUnit test framework.  

Sample JUnit Interview Questions for Your Upcoming Interview

In this section, we’ll look at some sample interview questions in JUnit, mostly asked at interviews for freshers.

  1. What do you understand about the @after annotation in JUnit?
  2. What do you understand about the @Type annotation in JUnit?
  3. What are Assert methods in JUnit?
  4. What do you understand by a test suite in JUnit?
  5. What do you understand by a JUnit fixture?
  6. What do you understand by Stubbing and Mocking in JUnit?
  7. How do you achieve test isolation in JUnit?
  8. Explain the process of writing a typical test case in JUnit.
  9. What is the @BeforeClass annotation in JUnit?
  10. What is the @AfterClass annotation in JUnit?

JUnit Interview Questions for Experienced Programmers and Testers

As an experienced programmer, your knowledge of JUnit and other unit testing frameworks is evaluated in Java interviews.

To give you an idea of what to expect, we’ve compiled a list of common JUnit interview questions for experienced developers.

  1. What are some best practices to follow while writing JUnit test cases?
  2. How would you run the JUnit environment from the command window?
  3. How do you test protected methods in JUnit?
  4. Explain how to assert exceptions thrown in JUnit tests
  5. What do you understand about Hamcrest Matchers in JUnit?
  6. What do you understand by cyclomatic complexity of code?
  7. What are code coverages?
  8. How do you test private methods in JUnit?
  9. Why is mocking required in Unit Testing?
  10. What is the difference between @injectmocks and @mock?
  11. How do you mock void methods in Mockito?
  12. What is the function of SPY in JUnit?

Practicing these JUnit interview questions will help you get interview-ready for your next Java developer/tester interview.

FAQs on JUnit Interview Questions

Q1. Which programming language is JUnit developed explicitly for?

JUnit is a unit testing framework specifically developed for Java. It is part of a family of unit testing frameworks known collectively as xUnit.

Q2. Where are JUnit interview questions typically asked?

JUnit interview questions are typically asked at Java developer and tester interviews. Questions are typically around the framework’s core features and functionalities.

Q4. What important topics should be prepared to answer JUnit coding interview questions?

JUnit interview questions at technical interviews are typically around JUnit test cases, annotations, methods, unit testing, regression testing, fixtures, and code coverages.

Q5. What is the average Java developer salary in the US?

The average Java developer salary in the United States is $97,343 per year, according to glassdoor.com

Gear Up for Your Next Technical Interview

Are you getting ready for your upcoming technical interview? Register for our technical interview webinarto get insightful guidance and tactics to crack technical interviews at the biggest companies.

At Interview Kickstart, we’ve trained over 11,000 engineers to land lucrative offers at the biggest tech companies. Our instructors, who are FAANG hiring managers, know what it takes to nail tough tech interviews at top technology companies.

Register for our FREE webinar to learn more.

Recession-proof your Career

Recession-proof your Test Engineering Career

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Register for Webinar

Recession-proof your Career

Recession-proof your Test Engineering Career

Attend our free webinar to amp up your career and get the salary you deserve.

Ryan-image
Hosted By
Ryan Valles
Founder, Interview Kickstart
blue tick
Accelerate your Interview prep with Tier-1 tech instructors
blue tick
360° courses that have helped 14,000+ tech professionals
blue tick
57% average salary hike received by alums in 2022
blue tick
100% money-back guarantee*
Register for Webinar

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