File asciiFile = getTestFile("ascii.txt");
    File dir = asciiFile.getParentFile();
    assertTrue(Files.isDirectory().apply(dir));
    assertFalse(Files.isFile().apply(dir));

    assertFalse(Files.isDirectory().apply(asciiFile));
    assertTrue(Files.isFile().apply(asciiFile));
  }

  /** Returns a root path for the file system. */
  private static File root() {
    return File.listRoots()[0];
  }

    File asciiFile = getTestFile("ascii.txt");
    File dir = asciiFile.getParentFile();
    assertTrue(Files.isDirectory().apply(dir));
    assertFalse(Files.isFile().apply(dir));

    assertFalse(Files.isDirectory().apply(asciiFile));
    assertTrue(Files.isFile().apply(asciiFile));
  }

  /** Returns a root path for the file system. */
  private static File root() {
    return File.listRoots()[0];
  }

    }

    @Override
    public Optional<Long> sizeIfKnown() {
      if (file.isFile()) {
        return Optional.of(file.length());
      } else {
        return Optional.absent();
      }
    }

    @Override
    public long size() throws IOException {
      if (!file.isFile()) {
        throw new FileNotFoundException(file.toString());
      }
      return file.length();
    }

energetic remedies--'

  `Speak English!' said the Eaglet.  `I don't know the meaning of
half those long words, and, what's more, I don't believe you do
either!'  And the Eaglet bent down its head to hide a smile:
some of the other birds tittered audibly.

  `What I was going to say,' said the Dodo in an offended tone,
`was, that the best thing to get us dry would be a Caucus-race.'

      AtomicReferenceArray<ReferenceEntry<K, V>> table = segment.table;
      for (int i = 0; i < table.length(); i++) {
        for (ReferenceEntry<K, V> e = table.get(i); e != null; e = e.getNext()) {
          if (map.isLive(e, now)) {
            result++;
          }
        }
      }
    }
    return result;
  }

  public void testClear() {
    LocalCache<Object, Object> map =

      AtomicReferenceArray<ReferenceEntry<K, V>> table = segment.table;
      for (int i = 0; i < table.length(); i++) {
        for (ReferenceEntry<K, V> e = table.get(i); e != null; e = e.getNext()) {
          if (map.isLive(e, now)) {
            result++;
          }
        }
      }
    }
    return result;
  }

  public void testClear() {
    LocalCache<Object, Object> map =

  }

  /**
   * This method is a convenience for testing. Code should call {@link Segment#getLiveValue}
   * instead.
   */
  @VisibleForTesting
  boolean isLive(ReferenceEntry<K, V> entry, long now) {
    return segmentFor(entry.getHash()).getLiveValue(entry, now) != null;
  }

  /**
   * Returns the segment that should be used for a key with the given hash.
   *

energetic remedies--'

  `Speak English!' said the Eaglet.  `I don't know the meaning of
half those long words, and, what's more, I don't believe you do
either!'  And the Eaglet bent down its head to hide a smile:
some of the other birds tittered audibly.

  `What I was going to say,' said the Dodo in an offended tone,
`was, that the best thing to get us dry would be a Caucus-race.'

  }

  /**
   * This method is a convenience for testing. Code should call {@link Segment#getLiveValue}
   * instead.
   */
  @VisibleForTesting
  boolean isLive(ReferenceEntry<K, V> entry, long now) {
    return segmentFor(entry.getHash()).getLiveValue(entry, now) != null;
  }

  /**
   * Returns the segment that should be used for a key with the given hash.
   *