@Test
public void testToRomans() {

    assertEquals("MCMX", RomanNumbersUtils.toRoman(1910));
    assertEquals("MCMLIV", RomanNumbersUtils.toRoman(1954));
    assertEquals("MCMXC", RomanNumbersUtils.toRoman(1990));
    assertEquals("C", RomanNumbersUtils.toRoman(100));
}