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JUnit with Maven 

T 
/**
 * JUNIT WITH MAVEN - BASIC TEST
 * -----------------------------
 * This example demonstrates how Maven integrates with JUnit
 * to run automated tests.
 * 
 * KEY CONCEPT:
 * ------------
 *  - JUnit is a testing framework
 *  - Maven runs tests automatically during the build lifecycle
 *  - Tests are located in: src/test/java
 * 
 * MAVEN COMMANDS:
 * ---------------
 * mvn test
 *  - Compiles main code and test code
 *  - Executes all test classes
 *  - Fails the build if any test fails
 * 
 * mvn package
 *  - Run tests FIRST
 *  - Then package the application
 *  - Build fails if tests fails
 * 
 * TEST DISCOVERY RULE:
 * --------------------
 * Maven automatically runs test classes named:
 *   *Test.java
 *   Test*.java
 *   *TestCase.java
 */

package demo;

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

public class TestJunitApp {

    @Test
    public void testSum() {

        // ARANGE
        int a = 5;
        int b = 10;

        // ACT
        int result = a + b;

        // ASSERT
        assertEquals(15, result);
    }
}

Pom 

 
<?xml version="1.0" encoding="UTF-8"?>
<project 
    xmlns="http://maven.apache.org/POM/4.0.0" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
        https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>demo</groupId>
    <artifactId>testJuniApp</artifactId>
    <packaging>jar</packaging>
    <version>0.1.0</version>

    <!-- Java version used by the compiler -->
    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <!-- JUnit 4 dependency (used only for tests) -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>3.5.0</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <createDependencyReducedPom>false</createDependencyReducedPom>
                            <transformers>
                                <transformer implementation=
                        "org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                    <mainClass>demo.TestJuniApp</mainClass>
                                </transformer>
                            </transformers>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>