{"\xed\xbf\xbf", "\uFFFD", "\uFFFD"},
	{"\xF0\x80\x80\xaf", "☺", "☺"},
	{"\xF8\x80\x80\x80\xAF", "\uFFFD", "\uFFFD"},
	{"\xFC\x80\x80\x80\x80\xAF", "\uFFFD", "\uFFFD"},
}

func TestToValidUTF8(t *testing.T) {
	for _, tc := range toValidUTF8Tests {
		got := ToValidUTF8([]byte(tc.in), []byte(tc.repl))
		if !Equal(got, []byte(tc.out)) {