.addEqualityGroup(Predicates.equalTo(1), Predicates.equalTo(1))
        .addEqualityGroup(Predicates.equalTo(2))
        .addEqualityGroup(Predicates.<@Nullable Integer>equalTo(null))
        .testEquals();
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testIsEqualTo_serialization() {
    checkSerialization(Predicates.equalTo(1));
  }

        Iterators.removeIf(
            list.iterator(),
            new Predicate<String>() {
              @Override
              public boolean apply(String s) {
                return s.equals("b") || s.equals("d") || s.equals("f");
              }
            }));
    assertEquals(newArrayList("a", "c", "e"), list);
    assertFalse(
        Iterators.removeIf(
            list.iterator(),

    assertEquals(1, Iterables.indexOf(list, Predicates.equalTo("bob")));
    assertEquals(-1, Iterables.indexOf(list, Predicates.equalTo("jack")));
  }

  public void testIndexOf_withDuplicates() {
    List<String> list = Lists.newArrayList("mary", "bob", "bob", "bob", "sam");
    assertEquals(0, Iterables.indexOf(list, Predicates.equalTo("mary")));

    assertEquals(1, Iterables.indexOf(list, Predicates.equalTo("bob")));
    assertEquals(-1, Iterables.indexOf(list, Predicates.equalTo("jack")));
  }

  public void testIndexOf_withDuplicates() {
    List<String> list = Lists.newArrayList("mary", "bob", "bob", "bob", "sam");
    assertEquals(0, Iterables.indexOf(list, Predicates.equalTo("mary")));

    FluentIterable<String> iterable = FluentIterable.from(Lists.newArrayList("cool", "pants"));
    assertThat(iterable.firstMatch(Predicates.equalTo("cool"))).hasValue("cool");
    assertThat(iterable.firstMatch(Predicates.equalTo("pants"))).hasValue("pants");
    assertThat(iterable.firstMatch(Predicates.alwaysFalse())).isAbsent();
    assertThat(iterable.firstMatch(Predicates.alwaysTrue())).hasValue("cool");
  }

        Iterators.removeIf(
            list.iterator(),
            new Predicate<String>() {
              @Override
              public boolean apply(String s) {
                return s.equals("b") || s.equals("d") || s.equals("f");
              }
            }));
    assertEquals(newArrayList("a", "c", "e"), list);
    assertFalse(
        Iterators.removeIf(
            list.iterator(),

                    multimap.put("foo", 16);
                    multimap =
                        Multimaps.filterKeys(multimap, Predicates.not(Predicates.equalTo("foo")));
                    return Multimaps.filterKeys(
                        multimap, Predicates.not(Predicates.equalTo("bar")));
                  }
                })
            .named("Multimaps.filterKeys[Multimaps.filterKeys[ListMultimap], Predicate]")

    }

    @Override
    public boolean equals(@CheckForNull Object obj) {
      if (obj instanceof IsEqualToPredicate) {
        IsEqualToPredicate that = (IsEqualToPredicate) obj;
        return target.equals(that.target);
      }
      return false;
    }

    @Override
    public String toString() {
      return "Predicates.equalTo(" + target + ")";
    }

    }

    boolean hasAnyPositiveInfinity() {
      return Iterables.any(values, Predicates.equalTo(POSITIVE_INFINITY));
    }

    boolean hasAnyNegativeInfinity() {
      return Iterables.any(values, Predicates.equalTo(NEGATIVE_INFINITY));
    }

    boolean hasAnyNaN() {
      return Iterables.any(values, Predicates.equalTo(NaN));
    }

    boolean hasAnyNonFinite() {

    assertEquals(1, matcher.countIn(s));
  }

  /**
   * Checks that expected is equals to out, and further, if in is equals to expected, then out is
   * successfully optimized to be identical to in, i.e. that "in" is simply returned.
   */
  private void assertEqualsSame(String expected, String in, String out) {
    if (expected.equals(in)) {
      assertSame(in, out);
    } else {
      assertEquals(expected, out);
    }