public void testGet_nullContained() {
    initMapWithNullKey();
    assertEquals("get(null) should return the associated value", getValueForNullKey(), get(null));
  }

  public void testGet_wrongType() {
    try {
      assertNull("get(wrongType) should return null or throw", getMap().get(WrongType.VALUE));
    } catch (ClassCastException tolerated) {
    }
  }

    initMapWithNullValue();
    assertNull(
        "getOrDefault(mappedToNull, default) should return null",
        getMap().getOrDefault(getKeyForNullValue(), v3()));
  }

  public void testGet_wrongType() {
    try {
      assertEquals(
          "getOrDefault(wrongType, default) should return default or throw",
          v3(),
          getMap().getOrDefault(WrongType.VALUE, v3()));