Set<Entry<String, Integer>> entrySet = map.entrySet();
    assertTrue(entrySet instanceof SynchronizedSet);
    assertSame(mutex, ((SynchronizedSet<?>) entrySet).mutex);
  }

  public void testEquals() {
    boolean unused = create().equals(new HashMap<String, Integer>());
  }

  public void testHashCode() {
    int unused = create().hashCode();
  }

  public void testToString() {

    // return collection::iterator;
    return new Iterable<T>() {
      @Override
      public Iterator<T> iterator() {
        return collection.iterator();
      }
    };
  }

  public void testEquals() {
    new EqualsTester()
        .addEqualityGroup(ImmutableDoubleArray.of())
        .addEqualityGroup(
            ImmutableDoubleArray.of(1, 2),
            reserialize(ImmutableDoubleArray.of(1, 2)),

    // return collection::iterator;
    return new Iterable<T>() {
      @Override
      public Iterator<T> iterator() {
        return collection.iterator();
      }
    };
  }

  public void testEquals() {
    new EqualsTester()
        .addEqualityGroup(ImmutableDoubleArray.of())
        .addEqualityGroup(
            ImmutableDoubleArray.of(1, 2),
            reserialize(ImmutableDoubleArray.of(1, 2)),

        assertEquals("3", false, StringUtil.contains("abc", "d"));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testEquals() throws Exception {
        assertEquals("1", true, StringUtil.equals("a", "a"));
        assertEquals("2", true, StringUtil.equals(null, null));
        assertEquals("3", false, StringUtil.equals("a", null));

    for (Integer node : graph.nodes()) {
      new EqualsTester()
          .addEqualityGroup(
              graph.predecessors(node), graph.successors(node), graph.adjacentNodes(node))
          .testEquals();
    }
  }

  @Override
  @Test
  public void nodes_checkReturnedSetMutability() {
    assume().that(graphIsMutable()).isTrue();

    Set<Integer> nodes = graph.nodes();

        .addEqualityGroup(new TypeToken<List<Integer>>() {}.method(setMethod))
        .addEqualityGroup(new TypeToken<List<String>>() {}.method(setMethod))
        .testEquals();
  }

  private interface Loser<E extends Throwable> {
    void lose() throws E;
  }

  public <T extends Loser<AssertionError>> void testMethod_exceptionTypes()

          if (EVEN.apply(i)) {
            expected.add(i);
          }
        }
        new EqualsTester()
            .addEqualityGroup(expected, filter(createUnfiltered(contents), EVEN))
            .testEquals();
      }
    }
  }

  public abstract static class AbstractFilteredSortedSetTest<C extends SortedSet<Integer>>
      extends AbstractFilteredSetTest<C> {
    public void testFirst() {

        .addEqualityGroup(new TypeToken<List<Integer>>() {}.method(setMethod))
        .addEqualityGroup(new TypeToken<List<String>>() {}.method(setMethod))
        .testEquals();
  }

  private interface Loser<E extends Throwable> {
    void lose() throws E;
  }

  public <T extends Loser<AssertionError>> void testMethod_exceptionTypes()

    oos.writeObject(keySet);
    oos.writeObject(values);
    oos.close();

    int finalSize = bytes.size();

    assertThat(finalSize - mapSize).isLessThan(100);
  }

  public void testEquals() {
    new EqualsTester()
        .addEqualityGroup(
            ImmutableMap.of(),
            ImmutableMap.builder().buildOrThrow(),
            ImmutableMap.ofEntries(),
            map())

    EqualsTester tester = new EqualsTester();
    for (int i = 0; i < instances; i++) {
      tester.addEqualityGroup(generator.generateFresh(type));
    }
    tester.testEquals();
  }

  private static <T> void assertEqualInstance(Class<T> type, T value) {
    FreshValueGenerator generator = new FreshValueGenerator();
    assertEquals(value, generator.generateFresh(type));