assertTrue(set.contains("google"));
    assertFalse(set.contains(""));
    assertFalse(set.contains("california"));
    assertFalse(set.contains(null));
  }

  @SuppressWarnings("CollectionIncompatibleType") // testing incompatible types
  public void testExplicit_containsMismatchedTypes() {
    SortedSet<String> set =
        ImmutableSortedSet.orderedBy(STRING_LENGTH)

        expectedHash += entry.hashCode();
      }
      assertEquals(expectedHash, map.hashCode());
    }

    assertMoreInvariants(map);
  }

  @SuppressWarnings("CollectionIncompatibleType")
  private void assertEntrySetNotContainsString(Set<Entry<K, V>> entrySet) {
    // Very unlikely that a buggy collection would ever return true. It might accidentally throw.
    assertFalse(entrySet.contains("foo"));