theboreddev

    @Test
    public void convert_shouldReturnV() {

        final String romanNumeral = RomanNumerals.convert(5);

        assertThat(romanNumeral, is("V"));
    }

theboreddev

public class RomanNumerals {

    public static String convert(int number) {
        if (number == 5) {
            return "V";
        }
        return "I";
    }
}

theboreddev

public class RomanNumeralsTest {

    @Test
    public void convert_shouldReturnI() {

        final String romanNumeral = RomanNumerals.convert(1);

        assertThat(romanNumeral, is("I"));
    }

theboreddev

public class RomanNumerals {

    public static String convert(int number) {
        if (number == 5) {
            return "V";
        } else if (number ==10) {
            return "X";
        } else if (number == 50) {
            return "L";
        } else if (number == 100) {

theboreddev

import java.util.Map;

public class RomanNumerals {

    private static final Map<Integer, String> ROMAN_NUMERALS = Map.of(
            1, "I",
            5, "V",
            10, "X",
            50, "L",
            100, "C",

theboreddev

    @Test
    public void convert_shouldReturnII() {

        final String romanNumeral = RomanNumerals.convert(2);

        assertThat(romanNumeral, is("II"));
    }

theboreddev

public class RomanNumerals {

    private static final NavigableMap<Integer, String> ROMAN_NUMERALS = new TreeMap<>() {
        {
            put(1, "I");
            put(5, "V");
            put(10, "X");
            put(50, "L");
            put(100, "C");
            put(500, "D");

theboreddev

public class RomanNumerals {

    private static final NavigableMap<Integer, String> ROMAN_NUMERALS = new TreeMap<>() {
        {
            put(1, "I");
            put(5, "V");
            put(10, "X");
            put(50, "L");
            put(100, "C");
            put(500, "D");

theboreddev

    @Test
    public void convert_shouldReturnIII() {

        final String romanNumeral = RomanNumerals.convert(3);

        assertThat(romanNumeral, is("III"));
    }

theboreddev

public class RomanNumerals {

    private static final NavigableMap<Integer, String> ROMAN_NUMERALS = new TreeMap<>() {
        {
            put(1, "I");
            put(5, "V");
            put(10, "X");
            put(50, "L");
            put(100, "C");
            put(500, "D");