| // Copyright 2016 The Netstack Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package fragmentation |
| |
| import ( |
| "math" |
| "reflect" |
| "testing" |
| ) |
| |
| type updateHolesInput struct { |
| first uint16 |
| last uint16 |
| more bool |
| } |
| |
| var holesTestCases = []struct { |
| comment string |
| in []updateHolesInput |
| want []hole |
| }{ |
| { |
| comment: "No fragments. Expected holes: {[0 -> inf]}.", |
| in: []updateHolesInput{}, |
| want: []hole{{first: 0, last: math.MaxUint16, deleted: false}}, |
| }, |
| { |
| comment: "One fragment at beginning. Expected holes: {[2, inf]}.", |
| in: []updateHolesInput{{first: 0, last: 1, more: true}}, |
| want: []hole{ |
| {first: 0, last: math.MaxUint16, deleted: true}, |
| {first: 2, last: math.MaxUint16, deleted: false}, |
| }, |
| }, |
| { |
| comment: "One fragment in the middle. Expected holes: {[0, 0], [3, inf]}.", |
| in: []updateHolesInput{{first: 1, last: 2, more: true}}, |
| want: []hole{ |
| {first: 0, last: math.MaxUint16, deleted: true}, |
| {first: 0, last: 0, deleted: false}, |
| {first: 3, last: math.MaxUint16, deleted: false}, |
| }, |
| }, |
| { |
| comment: "One fragment at the end. Expected holes: {[0, 0]}.", |
| in: []updateHolesInput{{first: 1, last: 2, more: false}}, |
| want: []hole{ |
| {first: 0, last: math.MaxUint16, deleted: true}, |
| {first: 0, last: 0, deleted: false}, |
| }, |
| }, |
| { |
| comment: "One fragment completing a packet. Expected holes: {}.", |
| in: []updateHolesInput{{first: 0, last: 1, more: false}}, |
| want: []hole{ |
| {first: 0, last: math.MaxUint16, deleted: true}, |
| }, |
| }, |
| { |
| comment: "Two non-overlapping fragments completing a packet. Expected holes: {}.", |
| in: []updateHolesInput{ |
| {first: 0, last: 1, more: true}, |
| {first: 2, last: 3, more: false}, |
| }, |
| want: []hole{ |
| {first: 0, last: math.MaxUint16, deleted: true}, |
| {first: 2, last: math.MaxUint16, deleted: true}, |
| }, |
| }, |
| { |
| comment: "Two overlapping fragments completing a packet. Expected holes: {}.", |
| in: []updateHolesInput{ |
| {first: 0, last: 2, more: true}, |
| {first: 2, last: 3, more: false}, |
| }, |
| want: []hole{ |
| {first: 0, last: math.MaxUint16, deleted: true}, |
| {first: 3, last: math.MaxUint16, deleted: true}, |
| }, |
| }, |
| } |
| |
| func TestUpdateHoles(t *testing.T) { |
| for _, c := range holesTestCases { |
| r := newReassembler(0) |
| for _, i := range c.in { |
| r.updateHoles(i.first, i.last, i.more) |
| } |
| if !reflect.DeepEqual(r.holes, c.want) { |
| t.Errorf("Test \"%s\" produced unexepetced holes. Got %v. Want %v", c.comment, r.holes, c.want) |
| } |
| } |
| } |