return null;
                }));
    expectUnchanged();
  }

  @MapFeature.Require({SUPPORTS_PUT, ALLOWS_NULL_VALUES})
  @CollectionSize.Require(absent = ZERO)
  public void testComputeIfAbsent_nullTreatedAsAbsent() {
    initMapWithNullValue();
    assertEquals(
        "computeIfAbsent(presentAssignedToNull, function) should return newValue",
        getValueForNullKey(),
        getMap()