case StartElement:
		if err := p.writeStart(&t); err != nil {
			return err
		}
	case EndElement:
		if err := p.writeEnd(t.Name); err != nil {
			return err
		}
	case CharData:
		escapeText(p, t, false)
	case Comment:
		if bytes.Contains(t, endComment) {
			return fmt.Errorf("xml: EncodeToken of Comment containing --> marker")
		}
		p.WriteString("<!--")
		p.Write(t)
		p.WriteString("-->")

)

// EscapeText writes to w the properly escaped XML equivalent
// of the plain text data s.
func EscapeText(w io.Writer, s []byte) error {
	return escapeText(w, s, true)
}

// escapeText writes to w the properly escaped XML equivalent
// of the plain text data s. If escapeNewline is true, newline
// characters will be escaped.
func escapeText(w io.Writer, s []byte, escapeNewline bool) error {

	expectErr := "unwritable"
	err := EscapeText(errWriter{}, []byte{'A'})

	if err == nil || err.Error() != expectErr {
		t.Errorf("have %v, want %v", err, expectErr)
	}
}

func TestEscapeTextInvalidChar(t *testing.T) {
	input := []byte("A \x00 terminated string.")
	expected := "A \uFFFD terminated string."

	buff := new(strings.Builder)
	if err := EscapeText(buff, input); err != nil {

		case ']':
			inCharset = false
		case '/':
			// If "</script" appears in a regex literal, the '/' should not
			// close the regex literal, and it will later be escaped to
			// "\x3C/script" in escapeText.
			if i > 0 && i+7 <= len(s) && bytes.Equal(bytes.ToLower(s[i-1:i+7]), []byte("</script")) {
				i++
			} else if !inCharset {
				c.state, c.jsCtx = stateJS, jsCtxDivOp
				return c, i + 1
			}
		default:

		{"Decoder.Entity", Field, 0},
		{"Decoder.Strict", Field, 0},
		{"Directive", Type, 0},
		{"Encoder", Type, 0},
		{"EndElement", Type, 0},
		{"EndElement.Name", Field, 0},
		{"Escape", Func, 0},
		{"EscapeText", Func, 1},
		{"HTMLAutoClose", Var, 0},
		{"HTMLEntity", Var, 0},
		{"Header", Const, 0},
		{"Marshal", Func, 0},
		{"MarshalIndent", Func, 0},
		{"Marshaler", Type, 2},
		{"MarshalerAttr", Type, 2},