My JUnit tests don't work when I execute them via maven

Question

I use Maven on my test project and I wanted to test test option in Maven's lifecycle, but my JUnit test failed. I have a class named Arithmetics in src.main.java package and a class named ArithmeticsTest in src.test.java package.

When I run ArithmeticsTest on my own using IntelliJ IDEA everything works OK, and I have expected java.lang.AssertionError, so why I don't have such when I run test option in maven?

Console output:

---

T E S T S

Results : Tests run: 0, Failures: 0, Errors: 0, Skipped: 0

src.main.java.Arithmetics.java

public class Arithmetics
{
    public static int add(int a, int b)
    {
        return a + b;
    }
}

src.test.java.ArithmeticsTest.java

import org.junit.jupiter.api.RepeatedTest;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;

public class ArithmeticsTest
{
    @Test
    public void testAdd()
    {
        assertEquals(4, Arithmetics.add(2, 3));
    }
}

pom.xml

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>groupId</groupId>
    <artifactId>Test</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>15</maven.compiler.source>
        <maven.compiler.target>15</maven.compiler.target>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter</artifactId>
            <version>RELEASE</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter</artifactId>
            <version>RELEASE</version>
            <scope>compile</scope>
        </dependency>

    </dependencies>
    
</project>

Answer 1

As other answer already pointed out few things which may go wrong in your case, I am just adding the solution to your pom xml.

The surefire plugin version is the main culprit. Default with maven (2.12.4) will not work with junit-5 jupiter engine.

So just add the plugin in your with version 2.22.1 in your pom, it should work after that, assuming your folder structure as per required (see other answer).

<build>
    <pluginManagement>
        <plugins>
            <plugin>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.22.1</version>
            </plugin>
        </plugins>
    </pluginManagement>
</build>