x: []byte{0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, y: 0, expected: []byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06}, }} for i, tt := range examples { m := modulusFromBytes(tt.m) got := natFromBytes(tt.x).ExpandFor(m).shiftIn(uint(tt.y), m) if exp := natFromBytes(tt.expected).ExpandFor(m); got.Equal(exp) != 1 { t.Errorf("%d: got %v, expected %v", i, got, exp) } } } func TestModulusAndNatSiz(t *testing.T) { // These are 126 bit (2 * _W on 64-bit architectures) values, serialized...