Object[] array = newArrayList(set).toArray(new Integer[0]);
    assertEquals("", joiner.join(array));

    StringBuilder sb1FromIterable = new StringBuilder();
    assertSame(sb1FromIterable, joiner.appendTo(sb1FromIterable, set));
    assertEquals(0, sb1FromIterable.length());

    StringBuilder sb1FromIterator = new StringBuilder();
    assertSame(sb1FromIterator, joiner.appendTo(sb1FromIterator, set));

  public void testCopy() throws IOException {
    StringBuilder builder = new StringBuilder();
    long copied =
        CharStreams.copy(
            wrapAsGenericReadable(new StringReader(ASCII)), wrapAsGenericAppendable(builder));
    assertEquals(ASCII, builder.toString());
    assertEquals(ASCII.length(), copied);

    StringBuilder builder2 = new StringBuilder();
    copied =
        CharStreams.copy(

  public void testCopy() throws IOException {
    StringBuilder builder = new StringBuilder();
    long copied =
        CharStreams.copy(
            wrapAsGenericReadable(new StringReader(ASCII)), wrapAsGenericAppendable(builder));
    assertEquals(ASCII, builder.toString());
    assertEquals(ASCII.length(), copied);

    StringBuilder builder2 = new StringBuilder();
    copied =
        CharStreams.copy(

    Object[] array = newArrayList(set).toArray(new Integer[0]);
    assertEquals("", joiner.join(array));

    StringBuilder sb1FromIterable = new StringBuilder();
    assertSame(sb1FromIterable, joiner.appendTo(sb1FromIterable, set));
    assertEquals(0, sb1FromIterable.length());

    StringBuilder sb1FromIterator = new StringBuilder();
    assertSame(sb1FromIterator, joiner.appendTo(sb1FromIterator, set));

  abstract Cut<C> withUpperBoundType(BoundType boundType, DiscreteDomain<C> domain);

  abstract void describeAsLowerBound(StringBuilder sb);

  abstract void describeAsUpperBound(StringBuilder sb);

  abstract @Nullable C leastValueAbove(DiscreteDomain<C> domain);

  abstract @Nullable C greatestValueBelow(DiscreteDomain<C> domain);

  /*

            final int rightCount = rightPart.isEmpty() ? 0 : rightPart.split(":").length;
            final int zerosCount = 8 - leftCount - rightCount;
            final StringBuilder expanded = new StringBuilder(leftPart);
            for (int i = 0; i < zerosCount; i++) {
                if (expanded.length() > 0) {
                    expanded.append(":");
                }
                expanded.append("0");

            final String v = s.substring(CONTAINS.length());
            final StringBuilder buf = new StringBuilder(100);
            return ".*" + appendFileterPath(buf, escape(v)) + ".*";
        }
        if (s.startsWith(REGEXP_IGNORE_CASE)) {
            final String v = s.substring(REGEXP_IGNORE_CASE.length());
            final StringBuilder buf = new StringBuilder(100);
            buf.append("(?i)");

  static final Tree h = new Tree('h', d, e, g);

  static String iterationOrder(Iterable<? extends Node> iterable) {
    StringBuilder builder = new StringBuilder();
    for (Node t : iterable) {
      builder.append(t.value);
    }
    StringBuilder forEachBuilder = new StringBuilder();
    iterable.forEach(t -> forEachBuilder.append(t.value));
    assertTrue(

     * Package-private for testing.
     */
    static String parseJvmConfig(Path jvmConfigPath, String mavenProjectBasedir) throws IOException {
        StringBuilder result = new StringBuilder();

        for (String line : Files.readAllLines(jvmConfigPath, StandardCharsets.UTF_8)) {
            line = processLine(line, mavenProjectBasedir);
            if (line.isEmpty()) {

    }

    @Test
    @DisplayName("Should handle StringBuilder as CharSequence")
    void testJoinWithStringBuilder() {
        StringBuilder sb1 = new StringBuilder("first");
        StringBuilder sb2 = new StringBuilder("second");
        String result = StringUtil.join(",", sb1, sb2);
        assertEquals("first,second", result);
    }

    @Test