package slice import ( "testing" "github.com/stretchr/testify/require" ) var testCases = []struct { arr []byte rev []byte }{ { arr: []byte{}, rev: []byte{}, }, { arr: []byte{0x01}, rev: []byte{0x01}, }, { arr: []byte{0x01, 0x02, 0x03, 0x04}, rev: []byte{0x04, 0x03, 0x02, 0x01}, }, { arr: []byte{0x01, 0x02, 0x03, 0x04, 0x05}, rev: []byte{0x05, 0x04, 0x03, 0x02, 0x01}, }, } func TestCopyReverse(t *testing.T) { for _, tc := range testCases { arg := Copy(tc.arr) require.Equal(t, tc.arr, arg) have := CopyReverse(arg) require.Equal(t, tc.rev, have) // test that argument was copied for i := range have { have[i] = ^have[i] } require.Equal(t, tc.arr, arg) Reverse(arg) require.Equal(t, tc.rev, arg) if len(tc.arr) > 1 { require.NotEqual(t, tc.arr, arg) } } }