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Unit Testing Framework

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Deepika Sahu answered on January 31, 2021 Popularity 9/10 Helpfulness 1/10

answer Unit Testing Framework

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Unit Testing Framework

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JUnit
JUnit is an open-source regression testing framework that is used mainly by expert software developers to execute unit testing, speed up programming, and improve the quality of code in Java. The key purpose of introducing this framework is to allow Java developers to script and implement repeated test cases. This is amongst the most commonly used Java unit test frameworks.
JUnit framework is majorly used by experts to test small bunches of code.
You can also carry out automated tests of a site by combining Selenium WebDriver with JUnit for Java automated testing. 
When any fresh code is added, you will be asked to reboot the complete test cases and ensure about zero breakage.
Features
•	Test suites
•	Fixtures
•	JUnit classes
•	Test runners
Prerequisites For Installing JUnit
Based originally on SUnit & written in Smalltalk, this Java unit testing framework is extremely attuned with Selenium WebDriver.
The key reason being, it is derived from Java.
Some prerequisites, you will need to follow these-
•	Should have the JDK newest version installed in your system.
•	(Optional) Unzip the $JUNIT_HOME/src. jar file.
•	Have great know-how and expertise of app growth in an object-oriented language, particularly Java programming.
•	Download the new JUnit version & set up the environment.
Pros
There are various benefits of using JUnit among the available Java testing frameworks.
•	It can be used for both integration and unit tests as it supports Java 8 features.
Bugs can be easily detected in the early phase, ensuing in an unfailing and reliable code.
•	Developers or programmers, who work in a test-driven environment, find it extremely useful. 
They find it easier to read the code and scrutinize any glitches present.
•	The development of an anomaly free code as well as a more readable code acts as a confidence augmenter.
•	Almost all major IDEs, like Eclipse, NetBeans, Maven, Ant, and IntelliJIDEA, provide JUnit framework integrations. 
So, you can easily write and start unit testing straight from those IDEs.
•	By using the upgraded JUnit version (version 5), one can identify exemption very easily. 
Plus, they can implement test cases written in the older JUnit version.
•	One can also use this unit test framework for Java with Java 5 or other versions.
Cons
•	JUnit framework is not capable of implementing dependency tests.
Thus, in this state, we necessitate TestNG.
Is JUnit One Of The Best Java Testing Frameworks For You?
JUnit is a commonly used open-source framework based on Java. 
Both TestNG as well as JUnit do a similar job and their key traits are somehow the same, excluding the dependency test capabilities. 
The execution procedure of parameterized testing is also distinct in both frameworks.
Due to the fact that JUnit has been used for an extended period, there is great support from the community. 
It has been also defined as the standard Java Unit Testing Frameworks by integrating Selenium WebDriver for Java-based applications.
Although TestNG has few users and the community is ever-growing.
Thus, we are wrapping up with the suggestion that the choice between JUnit or TestNG for a Java test framework entirely depends upon the nature and necessities of specific applications.

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Contributed on Dec 12 2022

Deepika Sahu

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what is unit testing

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UNIT TESTING is a  software testing where individual
units or components of a software are tested.
The purpose is to validate that each unit of the 
software performs as designed.

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Contributed on Jan 31 2021

Obedient Ocelot

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Unit testing involves testing individual units or components of your application in isolation. In Spring Boot, you can use JUnit or any other testing framework to write unit tests for your application. You can use mock objects to simulate dependencies, so that you can test your code without relying on external systems. Unit tests can help you to catch bugs early in the development process and ensure that your code is functioning as expected.

Here’s an example of a simple unit test for a Spring Boot application using JUnit and Mockito:

Suppose we have a UserService class that depends on a UserRepository interface:

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Contributed on May 15 2023

Sumit Rawal

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Unit Testing:

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import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.Mockito.when;

import org.junit.jupiter.api.Test;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;

@ExtendWith(MockitoExtension.class)
public class UserServiceTest {
    @Mock
    private UserRepository userRepository;

    @Test
    public void testGetUsernameById() {
        // Create a mock user
        User user = new User();
        user.setId(1);
        user.setUsername("johndoe");

        // Set up the mock UserRepository to return the mock user
        when(userRepository.findUserById(1)).thenReturn(user);

        // Create the UserService and call the method we want to test
        UserService userService = new UserService(userRepository);
        String username = userService.getUsernameById(1);

        // Verify that the method returned the correct username
        assertEquals("johndoe", username);
    }
}

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Contributed on May 15 2023

Sumit Rawal

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