assertThrows(IllegalArgumentException.class, () -> parse(",weakKeys"));

    assertThrows(IllegalArgumentException.class, () -> parse("weakKeys,,softValues"));
  }

  public void testEqualsAndHashCode() {
    new EqualsTester()
        .addEqualityGroup(parse(""), parse(""))
        .addEqualityGroup(parse("concurrencyLevel=7"), parse("concurrencyLevel=7"))

  /* The names of the expected method that tests equals. */
  private static final ImmutableList<String> EQUALS_TEST_METHOD_NAMES =
      ImmutableList.of(
          "testEquals",
          "testEqualsAndHashCode",
          "testEqualsAndSerializable",
          "testEqualsAndSerialization",
          "testEquality");

  private static final Chopper TEST_SUFFIX =

      }
    }
  }

  public abstract static class AbstractFilteredSetTest<C extends Set<Integer>>
      extends AbstractFilteredCollectionTest<C> {
    public void testEqualsAndHashCode() {
      for (List<Integer> contents : SAMPLE_INPUTS) {
        Set<Integer> expected = new HashSet<>();
        for (Integer i : contents) {
          if (EVEN.apply(i)) {
            expected.add(i);

    assertThrows(IllegalArgumentException.class, () -> parse(",weakKeys"));

    assertThrows(IllegalArgumentException.class, () -> parse("weakKeys,,softValues"));
  }

  public void testEqualsAndHashCode() {
    new EqualsTester()
        .addEqualityGroup(parse(""), parse(""))
        .addEqualityGroup(parse("concurrencyLevel=7"), parse("concurrencyLevel=7"))