Unit Testing Interview Questions And Answers

Unit Testing Interview Questions list for experienced

  1. How to Run a JUnit Test Case in Eclipse?
  2. Can You Provide a List of Assertion Methods Supported by JUnit 4.4?
  3. Can You Explain the Life Cycle of a JUnit 4.4 Test Class?
  4. How Do You Test a Method That Does not Return Anything?
  5. Can You Describe Steps of Creating Test Case Classes in Eclipse?
  6. How simple is too simple to break?
  7. How Do I Run JUnit Tests from Command Window?
  8. What Do You Do When a Defect Is Reported?
  9. What?s the Unit Testing?
  10. How Often Should You Run Your JUnit Tests?
  11. Can You Explain the Life Cycle of a JUnit 3.8 Test Case Class?
  12. How To Wirte a Simple JUnit Test Class?
  13. When Objects Are Garbage Collected After a Test Is Executed?
  14. How To Group Test Cases Class using JUnit TestSuite?
  15. Can You Write a Simple Class for JUnit Testing in 1 Minute?
  16. How Do You Test a private Method?
  17. How to creating a Test Suite using JUnit in Eclipse?
  18. Do You Have To Write a Test for Everything?
  19. What Are JUnit 3.8 Naming Conventions?
  20. How Do You Launch a Debugger When a Test Fails?
  21. How To Create Test Class in Eclipse?
  22. How Do You Test Classes That Must Be Run in a J2EE Container?
  23. How To Compile a JUnit Test Class?
  24. How To Write Setup Code to Run Once for All Tests in a Test Class?
  25. Where Do You Download JUnit?
  26. When Should Unit Tests Should Be Written In Development Cycle?
  27. How Many Test Runners Are Supported in JUnit 3.8?
  28. How To Run a JUnit Test Class?

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Top Unit Testing interview questions and answers for freshers and experienced

What is Unit Testing ?

Answer : Unit testing is a method by which individual units of source code, sets of one or more computer program modules together with associated control data, usage procedures, and operating procedures, are tested to determine if they are fit for use

Questions : 1 :: How to Run a JUnit Test Case in Eclipse?

There are three ways to run JUnit Test Cases or Test Suites in Eclipse with JUnit plugin: org.junit_3.8.1.1. You can right click on the test case class or test suite class and select Run As >...View answers

Questions : 2 :: Can You Provide a List of Assertion Methods Supported by JUnit 4.4?

You should be able to answer this question by looking up the org.junit.Assert class API document. Here is a list of assertino methods supported by JUnit 4.4:* assertEquals(expected, actual)*...View answers

Questions : 3 :: Can You Explain the Life Cycle of a JUnit 4.4 Test Class?


A JUnit 4.4 test class contains a @Before method, an @After method and multiple @test methods. When calling a test runner to run this test class, the runner will execute those methods in a specific...View answers

Questions : 4 :: How Do You Test a Method That Does not Return Anything?

You need to follow the logic below to answer this question:* If a method is not returning anything through the "return" statement (void method), it may return data through its arguments. In this...View answers

Questions : 5 :: Can You Describe Steps of Creating Test Case Classes in Eclipse?

There are detailed steps to create a test case class in Eclipse with JUnit plugin: org.junit_3.8.1.1. Use the Browse button to search for a different super class. The default super class is...View answers

Questions : 6 :: How simple is too simple to break?


The general philosophy is this: if it can't break on its own, it's too simple to break.First example is the getX() method. Suppose the getX() method only answers the value of an instance variable....View answers

Questions : 7 :: How Do I Run JUnit Tests from Command Window?

To run JUnit tests from a command window, you need to check the following list:1. Make sure that JDK is installed and the "java" command program is accessible through the PATH setting. Type "java...View answers

Questions : 8 :: What Do You Do When a Defect Is Reported?

Don't forget to use this as a learning opportunity. Perhaps the defect could have been prevented by being more aggressive about testing everything that could reasonably break.Or perhaps there are...View answers

Questions : 9 :: What?s the Unit Testing?


Testing of individual component of software. Unit Testing is bit by bit or module by module we test the application that is called unit...View answers

Questions : 10 :: How Often Should You Run Your JUnit Tests?

Run all your unit tests as often as possible, ideally every time the code is changed. Make sure all your unit tests always run at 100%. Frequent testing gives you confidence that your changes didn't...View answers

Questions : 11 :: Can You Explain the Life Cycle of a JUnit 3.8 Test Case Class?

A JUnit 3.8 test case class contains a setUp() method, a tearDown() method and multiple testXXX() methods. When calling a test runner to run this test class, the runner will execute those methods in...View answers

Questions : 12 :: How To Wirte a Simple JUnit Test Class?

This is a common test in a job interview. You should be able to write this simple test class with one test method:import org.junit.*;public class HelloTest {@Test public void testHello() {String...View answers

Questions : 13 :: When Objects Are Garbage Collected After a Test Is Executed?

My guess would be that all objects used in a test will be ready for Java garbage collector to release them immediately after the test has been executed.By design, the tree of Test instances is built...View answers

Questions : 14 :: How To Group Test Cases Class using JUnit TestSuite?

Usually, there are many classes to be tested in a Java application. For each Java class in the application you need to write a JUnit test case class comtaining multiple test methods.You could call a...View answers

Questions : 15 :: Can You Write a Simple Class for JUnit Testing in 1 Minute?

You need to write a class with less than 10 lines. Here is a nice example provided in the article "Writing a JUnit Test in 5 minutes" by Kamal Mettananda with some minor changes:package...View answers

Questions : 16 :: How Do You Test a private Method?

When a method is declared as "private", it can only be accessed within the same class. So there is no way to test a "private" method of a target class from any test class.To resolve this problem,...View answers

Questions : 17 :: How to creating a Test Suite using JUnit in Eclipse?

No, just test everything that could reasonably break.Be practical and maximize your testing investment. Remember that investments in testing are equal investments in design. If defects aren't being...View answers

Questions : 18 :: Do You Have To Write a Test for Everything?

No, just test everything that could reasonably break.Be practical and maximize your testing investment. Remember that investments in testing are equal investments in design. If defects aren't being...View answers

Questions : 19 :: What Are JUnit 3.8 Naming Conventions?

JUnit 3.8 suggests the following naming conventions:Test Case Class: Named as [classname]Test.java, where "classname" is the name of the class that is being tested. A test case class define the...View answers

Questions : 20 :: How Do You Launch a Debugger When a Test Fails?

Configure the debugger to catch the java.lang.AssertionError exception and suspend the execution.Call the TestRunner to run the test under the debugger.When the test fails again, The debugger will...View answers

Questions : 21 :: How To Create Test Class in Eclipse?

There are five ways to create a JUnit test case class in Eclipse with JUnit plugin: org.junit_3.8.1. First, select the directory (usually unittests/) that you wish to create the test case class in.1....View answers

Questions : 22 :: How Do You Test Classes That Must Be Run in a J2EE Container?

To test classes that must be run in a J2EE container (e.g. servlets, EJBs), you should refactor J2EE components to delegate functionality to other objects that don't have to be run in a J2EE...View answers

Questions : 23 :: How To Compile a JUnit Test Class?

Compiling a JUnit test class is like compiling any other Java classes. The only thing you need watch out is that the JUnit JAR file must be included in the classpath. For example, to compile the test...View answers

Questions : 24 :: How To Write Setup Code to Run Once for All Tests in a Test Class?

From the previous question, you know that if you write a setup code under the "@Before" annotation, it will be executed many times: once per each test in the test class.Is there any way to write a...View answers

Questions : 25 :: Where Do You Download JUnit?

Where do I download JUnit? I don't think anyone will ask this question in a job interview. But the answer is simple. You should follow the download instructions from the JUnit official Website:...View answers

Questions : 26 :: When Should Unit Tests Should Be Written In Development Cycle?

If you are a TDD (Test-Driven Development) believer, you should write unit test before writing the code. Test-first programming is practiced by only writing new code when an automated test is...View answers

Questions : 27 :: How Many Test Runners Are Supported in JUnit 3.8?

JUnit 3.8 supports 3 test runners:junit.textui.TestRunner - A command line based tool to run tests. TestRunner expects the name of a TestCase class as argument. If this class defines a static suite...View answers

Questions : 28 :: How To Run a JUnit Test Class?

A JUnit test class usually contains a number of test methods. You can run all test methods in a JUnit test class with the JUnitCore runner class. For example, to run the test class HelloTest.java...View answers
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