urlConvertHelper.add("fuga", "hoge");
        urlConvertHelper.add("http/hoge", "peke");

        url = "http://hoge.com/http/fuga.html";
        assertEquals("http://hoge.com/peke.html", urlConvertHelper.convert(url));

        url = "tp://hoge.com/http/fuga.html";
        assertEquals("http://hoge.com/peke.html", urlConvertHelper.convert(url));
    }

    public void test_convert_null() {
        String url;

	in := `first_name,last_name,username
"Rob","Pike",rob
Ken,Thompson,ken
"Robert","Griesemer","gri"
`
	r := csv.NewReader(strings.NewReader(in))

	for {
		record, err := r.Read()
		if err == io.EOF {
			break
		}
		if err != nil {
			log.Fatal(err)
		}

		fmt.Println(record)
	}
	// Output:
	// [first_name last_name username]
	// [Rob Pike rob]
	// [Ken Thompson ken]
	// [Robert Griesemer gri]

        reader.beginObject();
        while (reader.peek() != END_OBJECT) {
            String attrName = reader.nextName();
            if (reader.peek() == BOOLEAN) {
                boolean attrValue = reader.nextBoolean();
                attributes = attributesFactory.concat(attributes, Attribute.of(attrName, Boolean.class), attrValue);
            } else if (reader.peek() == NUMBER) {
                Integer attrValue = reader.nextInt();

   *
   * <p>Calls to {@code peek()} should not change the state of the iteration, except that it
   * <i>may</i> prevent removal of the most recent element via {@link #remove()}.
   *
   * @throws NoSuchElementException if the iteration has no more elements according to {@link
   *     #hasNext()}
   */
  @ParametricNullness
  E peek();

  /**
   * {@inheritDoc}
   *

                    (callSiteStack.empty() ? "there is no current call" : "the current call is " + callSiteStack.peek().getCallableName())
            );
        }
        callSiteStack.peek().markedAsMatchedAtDispatchSite();
    }

  @CollectionSize.Require(ZERO)
  public void testPeek_empty() {
    assertNull("emptyQueue.peek() should return null", getQueue().peek());
    expectUnchanged();
  }

  @CollectionSize.Require(ONE)
  public void testPeek_size1() {
    assertEquals("size1Queue.peek() should return first element", e0(), getQueue().peek());
    expectUnchanged();
  }

  @CollectionFeature.Require(KNOWN_ORDER)

	if r.err != nil {
		if r.nerr++; r.nerr > 10000 {
			panic("go/build: import reader looping")
		}
		return 0
	}

	// Use r.peek as first input byte.
	// Don't just return r.peek here: it might have been left by peekByte(false)
	// and this might be peekByte(true).
	c := r.peek
	if c == 0 {
		c = r.readByte()
	}
	for r.err == nil && !r.eof {
		if skipSpace {

  @CollectionSize.Require(ZERO)
  public void testPeek_empty() {
    assertNull("emptyQueue.peek() should return null", getQueue().peek());
    expectUnchanged();
  }

  @CollectionSize.Require(ONE)
  public void testPeek_size1() {
    assertEquals("size1Queue.peek() should return first element", e0(), getQueue().peek());
    expectUnchanged();
  }

  @CollectionFeature.Require(KNOWN_ORDER)

@Throws(EOFException::class)
private fun Buffer.readChallengeHeader(result: MutableList<Challenge>) {
  var peek: String? = null

  while (true) {
    // Read a scheme name for this challenge if we don't have one already.
    if (peek == null) {
      skipCommasAndWhitespace()
      peek = readToken()
      if (peek == null) return
    }

    val schemeName = peek

    // Read a token68, a sequence of parameters, or nothing.

		// after the ID.
		buf.Truncate(buf.Len() - 1)
		fmt.Fprintf(buf, " {#%s}\n", b.ID)
	}
}

func newATXHeading(p *parseState, s line) (line, bool) {
	peek := s
	var n int
	if peek.trimHeading(&n) {
		s := peek.string()
		s = trimRightSpaceTab(s)
		// Remove trailing '#'s.
		if t := strings.TrimRight(s, "#"); t != trimRightSpaceTab(t) || t == "" {
			s = t
		}
		var id string