Unit testing interview questions

Introduction to Unit testing interview Question

Unit testing is seen as a key phase in the testing of software. It’s not easy for everyone to write test cases, but more practice, skill, and technology are required. You should join the Unit Testing Certification program at JanBask Training in order to learn all about unit tests and advice on writing robust test cases. Once you have completed the training, go to this questionnaire and evaluate your current level of skills. Let us first begin with basic questions; then, we will also discuss issues for advanced employees. Finally, let’s see Some Unit testing interview questions.

Below are the 10 important 2021 Microprocessor interview questions and answers that are frequently asked in an interview. These questions are divided into two parts are as follows:

Part 1 – Unit testing interview questions (Basic)

This first part covers basic Interview Questions and Answers.

Q1. What is smoking?

Answer:

In unit testing, we use mocking. An object you want to test may have other complex object dependencies. You replace the other objects with mocks simulating the behavior of the real objects to isolate the conduct of an object that you wish to test. So mocking creates objects in simple words that simulate the behavior of real objects.

Q2. What is Stubbing?

Answer:

A stub is a small program routine that replaces a longer program, perhaps loaded later or remotely located. For example, a Remote Procedure Call (RPC) program is compiled with stubs that replace the requested program. The stub accepts the request and then transfers it to the remote procedure (through another program). Once this procedure is done, the results or other status are returned to the bottom line, which transfers it to the application program.

Q3. What is Code Coverage?

Answer:

Code coverage is a metric that determines the number of lines of code validated successfully by a testing process, which helps to analyze how software is verified in depth. Of course, the ultimate aim of any software company is the development of software products for businesses. But, in order to achieve that goal, companies must ensure that all the essential quality features of the software they develop are accurate, maintainable, effective, trustworthy,  and safe.

Q4. Tell some brief about Unit testing?

Answer:

A unit test is a way to test a unit, the smallest code in a system that can logically be isolated. This is a function, a subroutine, a procedure, or a property in most programming languages. The single part of the definition is significant. Author Michael Feathers says in his book “Working Effectively with Legacy Code” that tests are not unit tests when relying on external systems: “If you talk to the database, you talk through the network, touch the file system, you need a system configuration, or you cannot run it simultaneously with any other test.”

Q5. How to check timeout testing, write some code?

Answer:

Here is the code from which we can check the timeout testing

@Test (timeout=10)
Public void infinity(){
While(true);
}

Part 2 – Unit testing interview questions (Advanced)

Let us now have a look at the advanced Interview Questions and Answers.

Q6. What is Branch Coverage?

Answer:

Branch coverage is a test method to ensure that all access codes can be executed at least once each of the potential branches is executed from each decision point. In other words, every branch is right and wrong. In addition, it helps validate all the branches in the code to ensure that no branch results in abnormal application behavior.

Q7. What is the Advantage of unit testing?

Answer:

There are many advantages of unit testing; some are UT simplifies the debugging process. UT forces better code and design, whether you use C#, Python, Java, JavaScript, or PHP. It means that you have a well-defined and cohesive code. Using unit testing and good unit testing tools, the total cost of a project is reduced. Early detection of bugs means fewer late changes and easier problems than if they were made later.

Q8. Who can perform Unit Testing?

Answer:

The developers usually perform unit testing during the development phase. At the same time, unit testing is usually done by automation engineers and QA experts if developers are occupied with other development tasks.

Q9. How can Unit test cases be avoided?

Answer:

It can help avoid long classes, procedures, functions, etc., when you are working with unit test cases. No long code is necessary, but the functionality of each small component needs to be tested step by step. It makes it easy to develop big apps.

Q10. List some various coverage code techniques

Answer:

Here is the list of coverage code technique

1. Condition coverage
2. Statement coverage
3. Decision coverage
4. Branch Coverage

Q11. What does the term Refactoring mean?

Answer:

This technique is used if you want to revamp any existing code. It is usually done in small steps in which the code alteration is not the functionality or logic. It also helps to correct bugs.

Conclusion

In this article, we have seen interview questions related to Unit testing. We hope you will find this article helpful for cracking an interview. All the best.

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