assertFreshInstance(new TypeToken<HashMap<String, ?>>() {});
  }

  public void testLinkedHashMap() {
    assertFreshInstance(new TypeToken<LinkedHashMap<String, ?>>() {});
  }

  public void testTreeMap() {
    assertFreshInstance(new TypeToken<TreeMap<String, ?>>() {});
  }

  public void testSortedMap() {
    assertFreshInstance(new TypeToken<SortedMap<?, String>>() {});
  }

    assertEquals(emptyMap(), map);
  }

  public void testConcurrentMap() {
    ConcurrentMap<Integer, Integer> map = Maps.newConcurrentMap();
    assertEquals(emptyMap(), map);
  }

  public void testTreeMap() {
    TreeMap<Integer, Integer> map = Maps.newTreeMap();
    assertEquals(emptyMap(), map);
    assertThat(map.comparator()).isNull();
  }

  public void testTreeMapDerived() {

    assertEquals(emptyMap(), map);
  }

  public void testConcurrentMap() {
    ConcurrentMap<Integer, Integer> map = Maps.newConcurrentMap();
    assertEquals(emptyMap(), map);
  }

  public void testTreeMap() {
    TreeMap<Integer, Integer> map = Maps.newTreeMap();
    assertEquals(emptyMap(), map);
    assertThat(map.comparator()).isNull();
  }

  public void testTreeMapDerived() {