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Unit testing is considered as a vital phase in software testing. It is not easy to write unit test cases for everyone, but it demands more practice, knowledge, and techniques. To know everything about Unit testing and tips for writing robust test cases, you should join the Unit Testing Certification program at JanBask Training. Once you are done with the training, go through this Unit Testing Interview Questions blog and evaluate your current skills level. Let us start with basic questions first then we will discuss questions for the advanced workforce too.
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Let us now try and answer unit testing interview questions here:
Ans:-Unit Testing is used to check the independent modules of a software app during the development phase. An independent module can be anything like procedure, function, etc. Unit testing is done by developers and testers together before the integration testing. They have to write unit test cases as well if needed.
Ans:-The working of a unit test case can be divided into 3 phases. At the first stage, it will initialize the specific module of a software app that you want to test. In the second stage, it will execute the test case. In the end, it will analyze the final output.
Ans:-
Ans:-If you want to check if the final output is right or not, then it becomes state-based.
Ans:-If you want to check the behavior of functions or procedures, whether they are invoked in the right way or not then it is interaction-based.
Ans:-Yes, I do have practical knowledge of unit test frameworks, Junit, and TestNG.
Ans:-Several test cases need to be executed repeatedly. If you need test cases for repeated execution then the Junit framework can help you.
Ans:-Unit Testing is generally done at the development phase so that it can be performed by developers. At the same time, if developers are occupied with other development tasks then unit testing is generally performed by automation engineers and QA experts.
Ans:-If you want to revamp any existing code, then this technique is used. It is generally done in small steps where only the code is changed, not the functionality or the logic. It helps in bug fixing too.
Ans:-Users are generally confused between unit testing and integration testing. Here is a quick comparison between the two for your reference.
Ans:-Starting testing at the last phase is not effective but it should be performed day by day. Mostly, Unit testing starts at the development phase and continues until the deployment. When testing is not performed from the very first stage, it saves your time, efforts, and investments too.
Ans:-Here is the sample code for your reference.
@Test (expected = IndexOutOfBoundsException.class) Public Void outOfBounds () { New ArrayList
Ans:-Here is the sample code for your reference.
@Test (timeout=100) Public Void infinity() { While (true); }
Ans:-It acts like documentation where the functionality of each individual component is recorded. Also, you can track quickly, what to test, and when.
Ans:-When you are working with unit test cases, it helps to avoid long classes, functions, procedures, etc. There is no need to write lengthy code but focus on testing functionality of each small component step by step. It will make the development of large apps easy.
Ans:- It is a class that is good for implementing interfaces without any logic. It just returns good or bad based on the implementation findings.
Ans:- It is a class that is suitable for exceptional handling, and it will give you a detailed idea of when a particular method was called. In case a method was not called by this class then you will be notified for the same.
Ans:- Stubs can set dynamic values when exceptions are thrown by methods. It works similar to mock classes but does not give any idea of whether either methods were called or not.
Ans:- It helps in working on interactions with how different modules are connected to each other. Also, it tests the particular block of the code in isolation.
Ans:- You have to check a total number of decision points within the code to compute the cyclomatic complexity. In case the value is higher, achieving the code coverage can be tough. So, try to keep the number of decision points as minimum as possible.
Ans:- It has more decision points, big methods, and multiple conditional loops.
Ans:-
Ans:- Here are the steps that you should follow while performing the Unit Testing.
Ans:- It will give you a complete idea of which extent an application has been tested. It will highlight the area of the code that has not been entertained by test cases yet. You can quickly take actions on the highlighted area and make your application more suitable for the deployment.
Ans:- The code coverage techniques are given below for testing any software app.
Ans:- They can be given as:
Ans:- It will study all statements in the code and recommend the necessary actions that can be taken as per the requirement. You can use the given formula for the statement coverage in Unit Testing.
Statement coverage = (number of executed statements / total number of statements) x 100
Ans:- It can be given as:
Prints (int a, int b) { -------- Printsum is a function int result =a+b; if (result> 0) Print ("positive",result) Else Print ("Negative", Result) } ----------- End of the Source Code
Ans:- There are Boolean expressions within a software app. It will report the True or False result for a Boolean Expression. It is tough to implement, so developers have to be extra careful when working on the decision coverage. You can use the given formula for the Decision coverage in Unit Testing.
Decision Coverage = Number of decision outcomes exercised / Total Number of Decision Outcomes
Ans:- It will help you in understanding the final output from each module. For example, if it is binary output, then it will check for the same. It will help you to check whether all modules are tested once or not. You can use the given formula for the Branch coverage in Unit Testing.
Branch Coverage = Number of Executed Branches / Total Number of Branches
Ans:- As the name suggests, it is suitable for conditional statements. It will check how expressions are evaluated for any conditional statement. It does not give a guaranteed output, still useful in different test scenarios. You can use the given formula for the Conditional coverage in Unit Testing.
Condition Coverage = Number of Executed Operands / Total Number of Operands
Ans:- Well, various tools can be used for the testing purpose. Here are a few popular ones that I have used in the past.
Ans:- These are common myths associated with the Unit Testing that there is no need to perform the testing and it is time-consuming too. But the truth is unit testing is a mandatory approach that makes things easier for developers and smoothens other testing approaches too.
Ans:- Here is a list of benefits I did notice when I was working on the last testing project.
Ans:- It is not expected to highlight each error in the software program. Also, it cannot work on integration errors but check independent units. This is the reason why unit testing needs to combine with other testing types like integration or performance testing.
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The list of unit testing interview questions is long, and you might come across unit testing interview questions which are not answered or mentioned in the blog, feel free to connect with our team for more.
You can even leave comments on unit testing interview questions which you feel need to be answered and we will surely reach out to you with the right answers to your unit testing interview questions.
Ans:- 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.
Ans:- 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.
Ans:- 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.
Ans:- 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.
Ans:-Here is the list of coverage code techniques
Ans:- 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.
Must Read: Usability Testing Interview Questions and Answers.
Ans:- Unit Testing is used to check the independent modules of a software app during the development phase. An independent module can be anything like procedure, function, etc. Unit testing is done by developers and testers together before the integration testing. They have to write unit test cases as well if needed.
Ans:- The working of a unit test case can be divided into 3 phases. At the first stage, it will initialize the specific module of a software app that you want to test. In the second stage, it will execute the test case. In the end, it will analyze the final output.
Ans:-
Ans:- If you want to check if the final output is right or not, then it becomes state-based.
Ans:- If you want to check the behavior of functions or procedures, whether they are invoked in the right way or not then it is interaction-based.
Discover more on unit testing tutorial and gain an overview of unit testing approach and framework.
Ans:- Yes, I do have practical knowledge of unit test frameworks, Junit, and TestNG.
Ans:- Several test cases need to be executed repeatedly. If you need test cases for repeated execution then the Junit framework can help you.
Ans:- Unit Testing is generally done at the development phase so that it can be performed by developers. At the same time, if developers are occupied with other development tasks then unit testing is generally performed by automation engineers and QA experts.
Learn more about Unit Testing and become familiar with functional application codes.
Ans:- If you want to revamp any existing code, then this technique is used. It is generally done in small steps where only the code is changed, not the functionality or the logic. It helps in bug fixing too.
Ans:- Unit testing is validation and verification methodology where the developers test the individual units of source code. Some key points to be remembered from: –
The blog lists all important questions that may be asked by you when you appear for a Unit test Interview. Check them thoroughly and try to find answers on your own. You may be asked to write unit test cases at a higher level, so be prepared for that. If you don’t know how to write test cases practically then join the Unit Testing certification program at JanBask Training now and expand your knowledge base right away. Our experts will give you a deep idea of basic concepts, type of testing, testing methodologies at the basic level. Moving ahead, you will learn writing test cases and executing test scripts at the advanced level. So, enroll now and get certified!
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