func TestInt64SliceSort(t *testing.T) {
is := util.Int64Slice{100, 10, 3, 20, 9, 30, -1}
assert.EqualValues(t, []int64{-1, 3, 9, 10, 20, 30, 100}, is.Sort().ToInt64())
assert.EqualValues(t, []int64{100, 30, 20, 10, 9, 3, -1}, is.Reverse().ToInt64())
}
