in  string
	out uint
}{
	{"0", 0},
	{"1", 0},
	{"-1", 0},
	{"4", 2},
	{"-8", 3},
	{"0x4000000000000000000", 74},
	{"-0x8000000000000000000", 75},
}

func TestTrailingZeroBits(t *testing.T) {
	for i, test := range tzbTests {
		in, _ := new(Int).SetString(test.in, 0)
		want := test.out
		got := in.TrailingZeroBits()

		if got != want {