Result of the roman numbers kata in Java

RomanNumbersTest.java

import static org.junit.Assert.*;

public class RomanNumbersTest {

	enum Roman {
		C(100), XC(90), L(50), XL(40), X(10), IX(9), V(5), IV(4), I(1);
		final int decimal;
		Roman(int decimal) { this.decimal = decimal; }

		static String of(int n) {
			String result = "";
			for (Roman num : values())
				while (n >= num.decimal) {
					result += num.name();
					n -= num.decimal;
				}
			return result;
		}
	}

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