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package protocol
import (
"slices"
"testing"
"github.com/stretchr/testify/require"
)
func TestValidVersion(t *testing.T) {
require.False(t, IsValidVersion(VersionUnknown))
require.False(t, IsValidVersion(versionDraft29))
require.True(t, IsValidVersion(Version1))
require.True(t, IsValidVersion(Version2))
require.False(t, IsValidVersion(1234))
}
func TestVersionStringRepresentation(t *testing.T) {
require.Equal(t, "unknown", VersionUnknown.String())
require.Equal(t, "draft-29", versionDraft29.String())
require.Equal(t, "v1", Version1.String())
require.Equal(t, "v2", Version2.String())
// check with unsupported version numbers from the wiki
require.Equal(t, "gQUIC 9", Version(0x51303039).String())
require.Equal(t, "gQUIC 13", Version(0x51303133).String())
require.Equal(t, "gQUIC 25", Version(0x51303235).String())
require.Equal(t, "gQUIC 48", Version(0x51303438).String())
require.Equal(t, "0x1234567", Version(0x01234567).String())
}
func TestRecognizesSupportedVersions(t *testing.T) {
require.False(t, IsSupportedVersion(SupportedVersions, 0))
require.False(t, IsSupportedVersion(SupportedVersions, maxGquicVersion))
require.True(t, IsSupportedVersion(SupportedVersions, SupportedVersions[0]))
require.True(t, IsSupportedVersion(SupportedVersions, SupportedVersions[len(SupportedVersions)-1]))
}
func TestVersionSelection(t *testing.T) {
tests := []struct {
name string
supportedVersions []Version
otherVersions []Version
expectedVersion Version
expectedOK bool
}{
{
name: "finds matching version",
supportedVersions: []Version{1, 2, 3},
otherVersions: []Version{6, 5, 4, 3},
expectedVersion: 3,
expectedOK: true,
},
{
name: "picks preferred version",
supportedVersions: []Version{2, 1, 3},
otherVersions: []Version{3, 6, 1, 8, 2, 10},
expectedVersion: 2,
expectedOK: true,
},
{
name: "no matching version",
supportedVersions: []Version{1},
otherVersions: []Version{2},
expectedOK: false,
},
{
name: "empty supported versions",
supportedVersions: []Version{},
otherVersions: []Version{1, 2},
expectedOK: false,
},
{
name: "empty other versions",
supportedVersions: []Version{102, 101},
otherVersions: []Version{},
expectedOK: false,
},
{
name: "both empty",
supportedVersions: []Version{},
otherVersions: []Version{},
expectedOK: false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
ver, ok := ChooseSupportedVersion(tt.supportedVersions, tt.otherVersions)
require.Equal(t, tt.expectedOK, ok)
if tt.expectedOK {
require.Equal(t, tt.expectedVersion, ver)
}
})
}
}
func isReservedVersion(v Version) bool { return v&0x0f0f0f0f == 0x0a0a0a0a }
func TestVersionGreasing(t *testing.T) {
// adding to an empty slice
greased := GetGreasedVersions([]Version{})
require.Len(t, greased, 1)
require.True(t, isReservedVersion(greased[0]))
// make sure that the greased versions are distinct,
// allowing for a small number of duplicates
var versions []Version
for range 25 {
versions = GetGreasedVersions(versions)
}
slices.Sort(versions)
var numDuplicates int
for i, v := range versions {
require.True(t, isReservedVersion(v))
if i > 0 && versions[i-1] == v {
numDuplicates++
}
}
require.LessOrEqual(t, numDuplicates, 3)
// adding it somewhere in a slice of supported versions
supported := []Version{10, 18, 29}
for _, v := range supported {
require.False(t, isReservedVersion(v))
}
var greasedVersionFirst, greasedVersionLast, greasedVersionMiddle int
for range 100 {
greased := GetGreasedVersions(supported)
require.Len(t, greased, 4)
var j int
for i, v := range greased {
if isReservedVersion(v) {
if i == 0 {
greasedVersionFirst++
}
if i == len(greased)-1 {
greasedVersionLast++
}
greasedVersionMiddle++
continue
}
require.Equal(t, supported[j], v)
j++
}
}
require.NotZero(t, greasedVersionFirst)
require.NotZero(t, greasedVersionLast)
require.NotZero(t, greasedVersionMiddle)
}
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