What is the usage of JUnit in Maven?

The steps for using JUnit in a Maven project are as follows:

1. Add the JUnit dependency in the pom.xml file.

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.13.2</version>
        <scope>test</scope>
    </dependency>
</dependencies>

1. Create a JUnit test class following the naming convention of ending in “Test”, such as MyClassTest.java.
2. In the test class, label the test method with the @Test annotation.

import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class MyClassTest {
    
    @Test
    public void testAddition() {
        MyClass obj = new MyClass();
        int result = obj.add(2, 3);
        assertEquals(5, result);
    }
}

1. Run tests using Maven command.

mvn test

Maven will automatically run all the methods in the test class that are annotated with @Test, and display the test results.

Note: When using JUnit, the test class and test methods must be declared with the public access modifier.