.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 {

    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();
    assertNull(find(iterator, Predicates.alwaysFalse(), null));
    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("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();
    assertNull(find(iterator, Predicates.alwaysFalse(), null));
    assertFalse(iterator.hasNext());
  }

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

  public void testTryFind() {

    Map<String, Integer> unfiltered = createUnfiltered();
    unfiltered.put("cat", 3);
    unfiltered.put("dog", 2);
    unfiltered.put("horse", 5);
    Predicate<Object> predicate = Predicates.alwaysFalse();
    Map<String, Integer> filtered = Maps.filterEntries(unfiltered, predicate);
    assertTrue(filtered.isEmpty());
  }

  public void testFilteredEntriesWildCardEntryPredicate() {

    assertThat(iterable.firstMatch(equalTo("cool"))).hasValue("cool");
    assertThat(iterable.firstMatch(equalTo("pants"))).hasValue("pants");
    assertThat(iterable.firstMatch(Predicates.alwaysFalse())).isAbsent();
    assertThat(iterable.firstMatch(Predicates.alwaysTrue())).hasValue("cool");
  }

  private static final class IntegerValueOfFunction implements Function<String, Integer> {
    @Override