assertThrows(EOFException.class, () -> CharStreams.skipFully(reader, 6));
  }

  public void testSkipFully() throws IOException {
    String testString = "abcdef";
    Reader reader = new StringReader(testString);

    assertEquals(testString.charAt(0), reader.read());
    CharStreams.skipFully(reader, 1);
    assertEquals(testString.charAt(2), reader.read());
    CharStreams.skipFully(reader, 2);

    assertThrows(EOFException.class, () -> CharStreams.skipFully(reader, 6));
  }

  public void testSkipFully() throws IOException {
    String testString = "abcdef";
    Reader reader = new StringReader(testString);

    assertEquals(testString.charAt(0), reader.read());
    CharStreams.skipFully(reader, 1);
    assertEquals(testString.charAt(2), reader.read());
    CharStreams.skipFully(reader, 2);

   * @param n the number of characters to skip
   * @throws EOFException if this stream reaches the end before skipping all the characters
   * @throws IOException if an I/O error occurs
   */
  public static void skipFully(Reader reader, long n) throws IOException {
    checkNotNull(reader);
    while (n > 0) {
      long amt = reader.skip(n);
      if (amt == 0) {
        throw new EOFException();
      }
      n -= amt;

    assertThrows(EOFException.class, () -> skipHelper(101, 0, new ByteArrayInputStream(bytes)));
  }

  private static void skipHelper(long n, int expect, InputStream in) throws IOException {
    ByteStreams.skipFully(in, n);
    assertEquals(expect, in.read());
    in.close();
  }

  private static final byte[] bytes = new byte[] {0x12, 0x34, 0x56, 0x78, 0x76, 0x54, 0x32, 0x10};

  public void testNewDataInput_empty() {

    assertThrows(EOFException.class, () -> skipHelper(101, 0, new ByteArrayInputStream(bytes)));
  }

  private static void skipHelper(long n, int expect, InputStream in) throws IOException {
    ByteStreams.skipFully(in, n);
    assertEquals(expect, in.read());
    in.close();
  }

  private static final byte[] bytes = new byte[] {0x12, 0x34, 0x56, 0x78, 0x76, 0x54, 0x32, 0x10};

  public void testNewDataInput_empty() {

   * @throws EOFException if this stream reaches the end before skipping all the bytes
   * @throws IOException if an I/O error occurs, or the stream does not support skipping
   */
  public static void skipFully(InputStream in, long n) throws IOException {
    long skipped = skipUpTo(in, n);
    if (skipped < n) {
      throw new EOFException(

  }

  public void testSkipNulls() {
    Joiner skipNulls = J.skipNulls();
    checkNoOutput(skipNulls, ITERABLE_);
    checkNoOutput(skipNulls, ITERABLE_NULL);
    checkNoOutput(skipNulls, ITERABLE_NULL_NULL);
    checkNoOutput(skipNulls, ITERABLE_FOUR_NULLS);
    checkResult(skipNulls, ITERABLE_1, "1");
    checkResult(skipNulls, ITERABLE_12, "1-2");
    checkResult(skipNulls, ITERABLE_123, "1-2-3");

  }

  public void testSkipNulls() {
    Joiner skipNulls = J.skipNulls();
    checkNoOutput(skipNulls, ITERABLE_);
    checkNoOutput(skipNulls, ITERABLE_NULL);
    checkNoOutput(skipNulls, ITERABLE_NULL_NULL);
    checkNoOutput(skipNulls, ITERABLE_FOUR_NULLS);
    checkResult(skipNulls, ITERABLE_1, "1");
    checkResult(skipNulls, ITERABLE_12, "1-2");
    checkResult(skipNulls, ITERABLE_123, "1-2-3");

 *
 * <pre>{@code
 * Joiner joiner = Joiner.on("; ").skipNulls();
 *  . . .
 * return joiner.join("Harry", null, "Ron", "Hermione");
 * }</pre>
 *
 * <p>This returns the string {@code "Harry; Ron; Hermione"}. Note that all input elements are
 * converted to strings using {@link Object#toString()} before being appended.
 *
 * <p>If neither {@link #skipNulls()} nor {@link #useForNull(String)} is specified, the joining

 *
 * <pre>{@code
 * Joiner joiner = Joiner.on("; ").skipNulls();
 *  . . .
 * return joiner.join("Harry", null, "Ron", "Hermione");
 * }</pre>
 *
 * <p>This returns the string {@code "Harry; Ron; Hermione"}. Note that all input elements are
 * converted to strings using {@link Object#toString()} before being appended.
 *
 * <p>If neither {@link #skipNulls()} nor {@link #useForNull(String)} is specified, the joining