FizzBuzz with java 8

FizzBuzz.java

import java.util.Arrays;

public class FizzBuzz {

    public static String compute(Integer number) {

        return Arrays.stream(Multipliers.values())
                .filter(m -> (number % m.multiple  == 0))
                .map(Enum::name)
                .reduce((s, r) -> s + r)
                .orElse(number.toString());
    }
    
    enum Multipliers {
        fizz(3), buzz(5);

        public final Integer multiple;

        Multipliers(Integer multiple) { this.multiple = multiple; }
    }
}

FizzBuzzSpec.java

import org.junit.Test;

import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;

public class FizzBuzzSpec {
    @Test
    public void when_passing_a_number_it_returns_a_string() {
        assertThat(FizzBuzz.compute(2), is("2"));
    }
    @Test
    public void when_passing_a_multiple_of_three_it_returns_fizz() {
        assertThat(FizzBuzz.compute(3), is("fizz"));
    }
    @Test
    public void when_passing_a_multiple_of_five_it_returns_buzz() {
        assertThat(FizzBuzz.compute(5), is("buzz"));
    }
    @Test
    public void when_passing_a_multiple_of_fifteen_it_returns_fizzbuzz() {
        assertThat(FizzBuzz.compute(15), is("fizzbuzz"));
    }
}