new EqualsTester()
        .addEqualityGroup(STR_TO_LONG, STR_TO_LONG.reverse().reverse())
        .addEqualityGroup(STR_TO_LONG.reverse(), STR_TO_LONG.reverse())
        .testEquals();
  }

  public void testReverseReverse() {
    Converter<String, Long> converter = STR_TO_LONG;
    assertEquals(converter, converter.reverse().reverse());
  }

  public void testApply() {

      SampleElements<Entry<K, V>> samples = generator.samples();
      return new SampleElements<>(
          reverse(samples.e0()),
          reverse(samples.e1()),
          reverse(samples.e2()),
          reverse(samples.e3()),
          reverse(samples.e4()));
    }

    private Entry<V, K> reverse(Entry<K, V> entry) {
      return Helpers.mapEntry(entry.getValue(), entry.getKey());
    }

  }

  @GwtIncompatible // stringConverter
  public void testStringConverter_reverse() {
    Converter<String, TestEnum> converter = Enums.stringConverter(TestEnum.class);
    assertEquals("CHEETO", converter.reverse().convert(TestEnum.CHEETO));
    assertEquals("HONDA", converter.reverse().convert(TestEnum.HONDA));
    assertEquals("POODLE", converter.reverse().convert(TestEnum.POODLE));
  }

  @J2ktIncompatible

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.annotations.GwtCompatible;
import java.io.Serializable;
import java.util.Iterator;

/** An ordering that uses the reverse of the natural order of the values. */
@GwtCompatible(serializable = true)
@SuppressWarnings({"unchecked", "rawtypes"}) // TODO(kevinb): the right way to explain this??
@ElementTypesAreNonnullByDefault

    assertEquals("FOO_BAR", UPPER_UNDERSCORE.converterTo(UPPER_CAMEL).reverse().convert("FooBar"));
    assertEquals("FOO_BAR", UPPER_UNDERSCORE.converterTo(LOWER_CAMEL).reverse().convert("fooBar"));
    assertEquals("FooBar", UPPER_CAMEL.converterTo(UPPER_UNDERSCORE).reverse().convert("FOO_BAR"));
    assertEquals("fooBar", LOWER_CAMEL.converterTo(UPPER_UNDERSCORE).reverse().convert("FOO_BAR"));
  }

    assertThat(Shorts.stringConverter().reverse().convert(null)).isNull();
  }

  public void testStringConverter_reverse() {
    Converter<String, Short> converter = Shorts.stringConverter();
    assertThat(converter.reverse().convert((short) 1)).isEqualTo("1");
    assertThat(converter.reverse().convert((short) 0)).isEqualTo("0");
    assertThat(converter.reverse().convert((short) -1)).isEqualTo("-1");

    assertThat(Floats.stringConverter().reverse().convert(null)).isNull();
  }

  @J2ktIncompatible
  @GwtIncompatible // Float.toString returns different value in GWT.
  public void testStringConverter_reverse() {
    Converter<String, Float> converter = Floats.stringConverter();
    assertThat(converter.reverse().convert(1.0f)).isEqualTo("1.0");
    assertThat(converter.reverse().convert(0.0f)).isEqualTo("0.0");

            .build();
    assertMapEquals(map, "two", 2, "three", 3, "one", 1, "four", 4, "five", 5);
    assertEquals(Ordering.<String>natural().reverse(), map.comparator());
  }

  public void testBuilderComparator() {
    Comparator<String> comparator = Ordering.<String>natural().reverse();
    ImmutableSortedMap<String, Integer> map =
        new ImmutableSortedMap.Builder<String, Integer>(comparator)
            .put("one", 1)

/**
 * A function from {@code A} to {@code B} with an associated <i>reverse</i> function from {@code B}
 * to {@code A}; used for converting back and forth between <i>different representations of the same
 * information</i>.
 *
 * <h3>Invertibility</h3>
 *
 * <p>The reverse operation <b>may</b> be a strict <i>inverse</i> (meaning that {@code
 * converter.reverse().convert(converter.convert(a)).equals(a)} is always true). However, it is very

    assertEquals(GeneralRange.all(ORDERING.reverse()), GeneralRange.all(ORDERING).reverse());
    assertEquals(
        GeneralRange.downTo(ORDERING.reverse(), 3, CLOSED),
        GeneralRange.upTo(ORDERING, 3, CLOSED).reverse());
    assertEquals(
        GeneralRange.upTo(ORDERING.reverse(), 3, OPEN),
        GeneralRange.downTo(ORDERING, 3, OPEN).reverse());
    assertEquals(