JUnit 4 Setup Example with IntelliJ + Maven

Step 1: Create a Java Project in IntelliJ with Maven

Open IntelliJ IDE and click on New Project button, or go to the menu option File -> New -> Project...

Make sure to select the Build System as Maven.

Step 2: Adding Junit 4 Maven Dependency to pom.xml

In the project folder, open the pom.xml file.

Add the below junit 4 dependency to your pom.xml file.

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

Make sure to "Load Maven Changes" so the required jar files get downloaded.

Step 3: Sample code to verify setup

Create a class TestJunit.java under src -> test -> java

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

public class TestJunit {

    @Test
    public void test1() {

        int expectedResult =  20;
        int actualResult = 20; //for testing

        assertEquals(expectedResult,actualResult);
    }

    @Test
    public void test2() {

        int expectedResult =  20;
        int actualResult = 19; //for testing

        assertEquals(expectedResult,actualResult);
    }


}

Now right-click on this class file and select - "Run TestJunit with Coverage", you should see one test pass and another fails.