Let's create this Java project with a multiplication function and accompanying tests.

**pom.xml**

```xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://maven.apache.org/POM/4.0.0"
         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>com.example.solution</groupId>
    <artifactId>multiplication-app</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <!-- Add any dependencies your project needs -->
    </dependencies>

</project>
```

**src/main/java/com/example/solution/Solution.java**

```java
package com.example.solution;

public class Solution {
    public int solution(int a, int b) {
        return a * b;
    }
}
```

**src/test/java/com/example/solution/SolutionTest.java**

```java
package com.example.solution;

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

public class SolutionTest {

    @Test
    void testMultiplication() {
        Solution solution = new Solution();
        int result = solution.solution(5, 3);
        assertEquals(15, result);
    }
}
```

**Compile**

```bash
mvn compile
```

This command uses Maven to compile your Java code and any dependencies specified in the `pom.xml` file.

**Test**

```bash
mvn test
```

This command runs the JUnit tests defined in `src/test/java/com/example/solution/SolutionTest.java`.  You should see output indicating whether the tests passed or failed.



Let me know if you have any other questions about this Java project!