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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package buffer_test contains tests for the VectorisedView type.
package buffer
import (
"reflect"
"testing"
)
// copy returns a deep-copy of the vectorised view.
func (vv VectorisedView) copy() VectorisedView {
uu := VectorisedView{
views: make([]View, 0, len(vv.views)),
size: vv.size,
}
for _, v := range vv.views {
uu.views = append(uu.views, append(View(nil), v...))
}
return uu
}
// 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)
}
return NewVectorisedView(size, views)
}
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 {
t.Run(c.comment, func(t *testing.T) {
got := c.inView.Clone(c.inBuffer)
if !reflect.DeepEqual(got, c.inView) {
t.Fatalf("got (%+v).Clone(%+v) = %+v, want = %+v",
c.inView, c.inBuffer, got, c.inView)
}
})
}
}
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