@Test public void shouldGetCorrectListOfMonths() { DateUtils dateUtils = new DateUtils(); final String[] months = dateUtils.getShortFormMonthsOfYear(); final String[] keys = new String[] {"1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12"}; Map<String, String> actualMonths = underTest.populateMonths(); assertEquals("expect size to be 12", 12, actualMonths.size()); assertArrayEquals(months, actualMonths.values().toArray()); assertArrayEquals(keys, actualMonths.keySet().toArray()); }