.addEqualityGroup(isOdd())
        .addEqualityGroup(Predicates.alwaysFalse())
        .testEquals();
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testAlwaysTrue_serialization() {
    checkSerialization(Predicates.alwaysTrue());
  }

  /*
   * Tests for Predicates.alwaysFalse().
   */

  public void testAlwaysFalse_apply() throws Exception {

    Function<Object, Boolean> alwaysFalse = Functions.forPredicate(Predicates.alwaysFalse());

    assertTrue(alwaysTrue.apply(0));
    assertFalse(alwaysFalse.apply(0));

    new EqualsTester()
        .addEqualityGroup(alwaysTrue, Functions.forPredicate(Predicates.alwaysTrue()))
        .addEqualityGroup(alwaysFalse)
        .addEqualityGroup(Functions.identity())
        .testEquals();

        .addEqualityGroup(isOdd())
        .addEqualityGroup(Predicates.alwaysFalse())
        .testEquals();
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testAlwaysTrue_serialization() {
    checkSerialization(Predicates.alwaysTrue());
  }

  /*
   * Tests for Predicates.alwaysFalse().
   */

  public void testAlwaysFalse_apply() throws Exception {

    Function<Object, Boolean> alwaysFalse = Functions.forPredicate(Predicates.alwaysFalse());

    assertTrue(alwaysTrue.apply(0));
    assertFalse(alwaysFalse.apply(0));

    new EqualsTester()
        .addEqualityGroup(alwaysTrue, Functions.forPredicate(Predicates.alwaysTrue()))
        .addEqualityGroup(alwaysFalse)
        .addEqualityGroup(Functions.identity())
        .testEquals();

    assertEquals("woot", find(iterator, Predicates.alwaysFalse(), "woot"));
    assertFalse(iterator.hasNext());
  }

  public void testFind_withDefault_notPresent_nullReturn() {
    Iterable<String> list = Lists.newArrayList("cool", "pants");
    Iterator<String> iterator = list.iterator();
    assertThat(find(iterator, Predicates.alwaysFalse(), null)).isNull();
    assertFalse(iterator.hasNext());
  }

  public void testReadLines_withLineProcessor() throws IOException {
    String text = "a\nb\nc";

    // Test a LineProcessor that always returns false.
    Reader r = new StringReader(text);
    LineProcessor<Integer> alwaysFalse =
        new LineProcessor<Integer>() {
          int seen;

          @Override
          public boolean processLine(String line) {
            seen++;
            return false;
          }

  public void testReadLines_withLineProcessor() throws IOException {
    String text = "a\nb\nc";

    // Test a LineProcessor that always returns false.
    Reader r = new StringReader(text);
    LineProcessor<Integer> alwaysFalse =
        new LineProcessor<Integer>() {
          int seen;

          @Override
          public boolean processLine(String line) {
            seen++;
            return false;
          }

    assertEquals("cool", find(list, equalTo("cool"), "woot"));
    assertEquals("pants", find(list, equalTo("pants"), "woot"));
    assertEquals("woot", find(list, Predicates.alwaysFalse(), "woot"));
    assertThat(find(list, Predicates.alwaysFalse(), null)).isNull();
    assertEquals("cool", find(list, Predicates.alwaysTrue(), "woot"));
    assertCanIterateAgain(list);
  }

  public void testTryFind() {