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 {