@Test public void someNullValues() {

  array[0] = "1";
  array[1] = "one";
  array[2] = "2";
  array[3] = "two";
  array[4] = "3";
  Map<String, String> map = builder.build(array);
  assertSize(map, 2);
  assertBaseCase(map);
  assertThat(map).containsOnly(
      entry("1", "one"),
      entry("2", "two")
  );
  assertThat(map).hasToString(
      "UnsafeArrayMap{1=one,2=two}"
  );
  assertThat(map.get("1")).isEqualTo("one");
  assertThat(map.get("2")).isEqualTo("two");
  assertThat(map.get("3")).isNull();
}