Result of the roman numbers kata in Java

RomanNumbersTest.java

package kata;

import java.util.Arrays;
import java.util.List;

import org.junit.Test;

import static org.junit.Assert.*;

public class RomanNumbersTest {

	static class Roman {
		final int decimal;
		final String roman;

		public Roman(int decimal, String roman) {
			this.decimal = decimal;
			this.roman = roman;
		}
	}

	static Roman one = new Roman(1, "I");
	static Roman four = new Roman(4, "IV");
	static Roman five = new Roman(5, "V");
	static Roman nine = new Roman(9, "IX");
	static Roman ten = new Roman(10, "X");
	static Roman fourty = new Roman(40, "XL");
	static Roman fifty = new Roman(50, "L");
	static Roman ninety = new Roman(90, "XC");
	static Roman hundred = new Roman(100, "C");

	static List<Roman> numbers = Arrays.asList(hundred, ninety, fifty, fourty, ten,
			nine, five, four, one);

	static String toRoman(int n) {
		String result = "";

		for (Roman num : numbers) {
			while (n >= num.decimal) {
				result += num.roman;
				n -= num.decimal;
			}
		}
		return result;
	}

	@Test
	public void testSimpleNumbers() {
		assertEquals("I", toRoman(1));
		assertEquals("II", toRoman(2));
		assertEquals("III", toRoman(3));
		assertEquals("IV", toRoman(4));
		assertEquals("V", toRoman(5));
		assertEquals("VI", toRoman(6));
		assertEquals("VII", toRoman(7));
		assertEquals("XXIII", toRoman(23));
		assertEquals("LV", toRoman(55));
		assertEquals("XLII", toRoman(42));
		assertEquals("XCIX", toRoman(99));
		assertEquals("CXI", toRoman(111));
	}
}