source: class MapUtilsTest {
  
      @Test
      public void ofFourIsFour() {
  
target:         Map<String, String> map = MapUtils.of("1", "A", "2", "B",
                  "3", "C", "4", "D");
          assertThat(map, hasEntry("1", "A"));
          assertThat(map, hasEntry("2", "B"));
          assertThat(map, hasEntry("3", "C"));
          assertThat(map, hasEntry("4", "D"));
      }
  
  }