JUnit Interview Questions and Answers

Junit is an important unit Java testing framework and helps in the development of test-driven development. It is a significant part of the family known as xUnit, and hence it got its a name, Junit. Junit framework runs automatically improving the results and providing immediate feedback.

Junit, an automation framework is used for UI testing and unit testing for the definition of the implementation of the code flown with different Annotations. It assists in writing the codes faster increasing the quality

• Flexibility- With the help of matches, Junit helps in the assertions of the multiple conditions such as any of(is(“Learn Junit)), constraintstring(“hello)));
• Enhanced failure messages- In the previous version of JUnit, the coding of the failure message was- org.junit.ComparisonFailure:expected:<hello[] but was :<hello[world]> But in the new version of JUnit, the better is java.lang.AssertionError:Expected: is “hello” but: was &lquo;hello world”
• Gives annotations for the identification of the test methods.
• Junit offers test runners for the running tests and assertions for testing expected results.
• It has simple and less complex taking less time in the operation of the testing process

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In case of the allocation of the expensive external resources in a BeforeClass method, then there is the requirement of releasing them after the running of the tests completes. For this, the annotation of the @AfterClass method, a public static void method is required to be run after all the class’s tests have been run. It is because of the feature of the method such as it guarantees the test is running even in the situation of an exception thrown by BeforeClass. It is one of the methods to be declared in the superclass and run after the running process of the current class ends. Also, it is called once per test class.

The special form of the syntactic meta-data that can be used for the improved code readability and structure in the source code. The examples of the entities that can be annotated are parameters, methods, variables, classes, and methods in the Java source code. JUnit annotations are Before, After, AfterClass, Ignore, BeforeClass, RunWith, and Test.

Junit testing is a framework written in Java for providing a standard way of organizing, writing, and running the tests. An accurate logic of the test can be written following a simple rule. Here, Junit means unit testing which implies the meaning as of checking the individual parts of a software system without the implementation of the entire system from end to end.

The multiple essential features of JUnit testing are the answer to the above question. Some of them are as follows-

• Useful in providing the status of the result after testing, i.e., shows green on the smooth running of the test, whereas, red is the color in the otherwise case.
• Test cases can be organized in the form of JUnit tests
• Helps in the fast writing and execution of the codes
• Junit testing helps in increasing the quality of the tests