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package protocol
import (
"bytes"
"crypto/rand"
"io"
"testing"
"github.com/stretchr/testify/require"
)
func TestGenerateRandomConnectionIDs(t *testing.T) {
c1, err := GenerateConnectionID(8)
require.NoError(t, err)
require.NotZero(t, c1)
require.Equal(t, 8, c1.Len())
c2, err := GenerateConnectionID(8)
require.NoError(t, err)
require.NotEqual(t, c1, c2)
require.Equal(t, 8, c2.Len())
}
func TestGenerateRandomLengthDestinationConnectionIDs(t *testing.T) {
var has8ByteConnID, has20ByteConnID bool
for i := 0; i < 1000; i++ {
c, err := GenerateConnectionIDForInitial()
require.NoError(t, err)
require.GreaterOrEqual(t, c.Len(), 8)
require.LessOrEqual(t, c.Len(), 20)
if c.Len() == 8 {
has8ByteConnID = true
}
if c.Len() == 20 {
has20ByteConnID = true
}
}
require.True(t, has8ByteConnID)
require.True(t, has20ByteConnID)
}
func TestConnectionID(t *testing.T) {
buf := bytes.NewBuffer([]byte{0xde, 0xad, 0xbe, 0xef, 0x42})
c, err := ReadConnectionID(buf, 5)
require.NoError(t, err)
require.Equal(t, []byte{0xde, 0xad, 0xbe, 0xef, 0x42}, c.Bytes())
require.Equal(t, 5, c.Len())
require.Equal(t, "deadbeef42", c.String())
// too few bytes
_, err = ReadConnectionID(buf, 10)
require.Equal(t, io.EOF, err)
// zero length
c2, err := ReadConnectionID(buf, 0)
require.NoError(t, err)
require.Zero(t, c2.Len())
// connection ID can have a length of a maximum of 20 bytes
buf2 := bytes.NewBuffer(make([]byte, 21))
_, err = ReadConnectionID(buf2, 21)
require.Equal(t, ErrInvalidConnectionIDLen, err)
}
func TestConnectionIDZeroValue(t *testing.T) {
var c ConnectionID
require.Zero(t, c.Len())
require.Empty(t, c.Bytes())
require.Equal(t, "(empty)", (ConnectionID{}).String())
}
func TestArbitraryLenConnectionID(t *testing.T) {
b := make([]byte, 42)
rand.Read(b)
c := ArbitraryLenConnectionID(b)
require.Equal(t, b, c.Bytes())
require.Equal(t, 42, c.Len())
}
func TestArbitraryLenConnectionIDStringer(t *testing.T) {
require.Equal(t, "(empty)", (ArbitraryLenConnectionID{}).String())
c := ArbitraryLenConnectionID([]byte{0xde, 0xad, 0xbe, 0xef, 0x42})
require.Equal(t, "deadbeef42", c.String())
}
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