}
    }

    // Test that 0xFFFE and 0xFFFF are replaced with 0xFFFD
    assertEscaping(xmlEscaper, "\uFFFD", '\uFFFE');
    assertEscaping(xmlEscaper, "\uFFFD", '\uFFFF');

    assertEquals(
        "0xFFFE is forbidden and should be replaced during escaping",
        "[\uFFFD]",
        xmlEscaper.escape("[\ufffe]"));
    assertEquals(
        "0xFFFF is forbidden and should be replaced during escaping",

    assertThat(converter.convert("0")).isEqualTo(0);
    assertThat(converter.convert("-1")).isEqualTo(-1);
    assertThat(converter.convert("0xff")).isEqualTo(255);
    assertThat(converter.convert("0xFF")).isEqualTo(255);
    assertThat(converter.convert("-0xFF")).isEqualTo(-255);
    assertThat(converter.convert("#0000FF")).isEqualTo(255);
    assertThat(converter.convert("0666")).isEqualTo(438);
  }

    for (int i = 0; i <= 0xff; i++) {
      assertThat(UnsignedBytes.toString((byte) i)).isEqualTo(Integer.toString(i));
    }
  }

  public void testToStringWithRadix() {
    // We can easily afford to test this exhaustively.
    for (int radix = Character.MIN_RADIX; radix <= Character.MAX_RADIX; radix++) {
      for (int i = 0; i <= 0xff; i++) {

  @GwtIncompatible // Chars.fromByteArray
  public void testFromByteArray() {
    assertThat(Chars.fromByteArray(new byte[] {0x23, 0x45, (byte) 0xDC})).isEqualTo('\u2345');
    assertThat(Chars.fromByteArray(new byte[] {(byte) 0xFE, (byte) 0xDC})).isEqualTo('\uFEDC');
  }

  @GwtIncompatible // Chars.fromByteArray
  public void testFromByteArrayFails() {
    assertThrows(

	{" ", []rune{32}, false},
	{"ABC", []rune{65, 66, 67}, false},
	{"abc", []rune{97, 98, 99}, false},
	{"\u65e5\u672c\u8a9e", []rune{26085, 26412, 35486}, false},
	{"ab\x80c", []rune{97, 98, 0xFFFD, 99}, true},
	{"ab\xc0c", []rune{97, 98, 0xFFFD, 99}, true},
}

func TestRunes(t *testing.T) {
	for _, tt := range RunesTests {
		tin := []byte(tt.in)
		a := Runes(tin)
		if !slices.Equal(a, tt.out) {

</p>

<pre>
^1         // untyped integer constant, equal to -2
uint8(^1)  // illegal: same as uint8(-2), -2 cannot be represented as a uint8
^uint8(1)  // typed uint8 constant, same as 0xFF ^ uint8(1) = uint8(0xFE)
int8(^1)   // same as int8(-2)
^int8(1)   // same as -1 ^ int8(1) = -2
</pre>

<p>
Implementation restriction: A compiler may use rounding while

0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, b: []byte{0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe}, }, { m: []byte{0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, b: []byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe}, fail: true, }, { m: []byte{0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, b: []byte{0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, fail: true, }, { m: []byte{0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, b: []byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe}, fail:...