| // 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 buffer_test contains tests for the VectorisedView type. |
| package buffer |
| |
| import ( |
| "reflect" |
| "testing" |
| ) |
| |
| // vv is an helper to build VectorisedView from different strings. |
| func vv(size int, pieces ...string) *VectorisedView { |
| views := make([]View, len(pieces)) |
| for i, p := range pieces { |
| views[i] = []byte(p) |
| } |
| |
| vv := NewVectorisedView(size, views) |
| return &vv |
| } |
| |
| var capLengthTestCases = []struct { |
| comment string |
| in *VectorisedView |
| length int |
| want *VectorisedView |
| }{ |
| { |
| comment: "Simple case", |
| in: vv(2, "12"), |
| length: 1, |
| want: vv(1, "1"), |
| }, |
| { |
| comment: "Case spanning across two Views", |
| in: vv(4, "123", "4"), |
| length: 2, |
| want: vv(2, "12"), |
| }, |
| { |
| comment: "Corner case with negative length", |
| in: vv(1, "1"), |
| length: -1, |
| want: vv(0), |
| }, |
| { |
| comment: "Corner case with length = 0", |
| in: vv(3, "12", "3"), |
| length: 0, |
| want: vv(0), |
| }, |
| { |
| comment: "Corner case with length = size", |
| in: vv(1, "1"), |
| length: 1, |
| want: vv(1, "1"), |
| }, |
| { |
| comment: "Corner case with length > size", |
| in: vv(1, "1"), |
| length: 2, |
| want: vv(1, "1"), |
| }, |
| } |
| |
| func TestCapLength(t *testing.T) { |
| for _, c := range capLengthTestCases { |
| orig := c.in.copy() |
| c.in.CapLength(c.length) |
| if !reflect.DeepEqual(c.in, c.want) { |
| t.Errorf("Test \"%s\" failed when calling CapLength(%d) on %v. Got %v. Want %v", |
| c.comment, c.length, orig, c.in, c.want) |
| } |
| } |
| } |
| |
| var trimFrontTestCases = []struct { |
| comment string |
| in *VectorisedView |
| count int |
| want *VectorisedView |
| }{ |
| { |
| comment: "Simple case", |
| in: vv(2, "12"), |
| count: 1, |
| want: vv(1, "2"), |
| }, |
| { |
| comment: "Case where we trim an entire View", |
| in: vv(2, "1", "2"), |
| count: 1, |
| want: vv(1, "2"), |
| }, |
| { |
| comment: "Case spanning across two Views", |
| in: vv(3, "1", "23"), |
| count: 2, |
| want: vv(1, "3"), |
| }, |
| { |
| comment: "Corner case with negative count", |
| in: vv(1, "1"), |
| count: -1, |
| want: vv(1, "1"), |
| }, |
| { |
| comment: " Corner case with count = 0", |
| in: vv(1, "1"), |
| count: 0, |
| want: vv(1, "1"), |
| }, |
| { |
| comment: "Corner case with count = size", |
| in: vv(1, "1"), |
| count: 1, |
| want: vv(0), |
| }, |
| { |
| comment: "Corner case with count > size", |
| in: vv(1, "1"), |
| count: 2, |
| want: vv(0), |
| }, |
| } |
| |
| func TestTrimFront(t *testing.T) { |
| for _, c := range trimFrontTestCases { |
| orig := c.in.copy() |
| c.in.TrimFront(c.count) |
| if !reflect.DeepEqual(c.in, c.want) { |
| t.Errorf("Test \"%s\" failed when calling TrimFront(%d) on %v. Got %v. Want %v", |
| c.comment, c.count, orig, c.in, c.want) |
| } |
| } |
| } |
| |
| var toViewCases = []struct { |
| comment string |
| in *VectorisedView |
| want View |
| }{ |
| { |
| comment: "Simple case", |
| in: vv(2, "12"), |
| want: []byte("12"), |
| }, |
| { |
| comment: "Case with multiple views", |
| in: vv(2, "1", "2"), |
| want: []byte("12"), |
| }, |
| { |
| comment: "Empty case", |
| in: vv(0), |
| want: []byte(""), |
| }, |
| } |
| |
| func TestToView(t *testing.T) { |
| for _, c := range toViewCases { |
| got := c.in.ToView() |
| if !reflect.DeepEqual(got, c.want) { |
| t.Errorf("Test \"%s\" failed when calling ToView() on %v. Got %v. Want %v", |
| c.comment, c.in, got, c.want) |
| } |
| } |
| } |
| |
| var toCloneCases = []struct { |
| comment string |
| inView *VectorisedView |
| inBuffer []View |
| }{ |
| { |
| comment: "Simple case", |
| inView: vv(1, "1"), |
| inBuffer: make([]View, 1), |
| }, |
| { |
| comment: "Case with multiple views", |
| inView: vv(2, "1", "2"), |
| inBuffer: make([]View, 2), |
| }, |
| { |
| comment: "Case with buffer too small", |
| inView: vv(2, "1", "2"), |
| inBuffer: make([]View, 1), |
| }, |
| { |
| comment: "Case with buffer larger than needed", |
| inView: vv(1, "1"), |
| inBuffer: make([]View, 2), |
| }, |
| { |
| comment: "Case with nil buffer", |
| inView: vv(1, "1"), |
| inBuffer: nil, |
| }, |
| } |
| |
| func TestToClone(t *testing.T) { |
| for _, c := range toCloneCases { |
| got := c.inView.Clone(c.inBuffer) |
| if !reflect.DeepEqual(&got, c.inView) { |
| t.Errorf("Test \"%s\" failed when calling Clone(%v) on %v. Got %v. Want %v", |
| c.comment, c.inBuffer, c.inView, got, c.inView) |
| } |
| } |
| } |