func TestIssue22830(t *testing.T) {
	one := new(Int).SetInt64(1)
	base, _ := new(Int).SetString("84555555300000000000", 10)
	mod, _ := new(Int).SetString("66666670001111111111", 10)
	want, _ := new(Int).SetString("17888885298888888889", 10)

	var tests = []int64{
		0, 1, -1,
	}

	for _, n := range tests {
		m := NewInt(n)
		if got := m.Exp(base, one, mod); got.Cmp(want) != 0 {