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// Copyright The Notary Project 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 ber
import (
"bytes"
"errors"
"testing"
)
func TestEncodeLength(t *testing.T) {
tests := []struct {
name string
length int
want []byte
wantErr bool
}{
{
name: "Length less than 128",
length: 127,
want: []byte{127},
wantErr: false,
},
{
name: "Length equal to 128",
length: 128,
want: []byte{0x81, 128},
wantErr: false,
},
{
name: "Length greater than 128",
length: 300,
want: []byte{0x82, 0x01, 0x2C},
wantErr: false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
buf := &bytes.Buffer{}
err := encodeLength(buf, tt.length)
if (err != nil) != tt.wantErr {
t.Errorf("encodeLength() error = %v, wantErr %v", err, tt.wantErr)
return
}
if got := buf.Bytes(); !bytes.Equal(got, tt.want) {
t.Errorf("encodeLength() = %v, want %v", got, tt.want)
}
})
}
}
func TestEncodedLengthSize(t *testing.T) {
tests := []struct {
name string
length int
want int
}{
{
name: "Length less than 128",
length: 127,
want: 1,
},
{
name: "Length equal to 128",
length: 128,
want: 2,
},
{
name: "Length greater than 128",
length: 300,
want: 3,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if got := encodedLengthSize(tt.length); got != tt.want {
t.Errorf("encodedLengthSize() = %v, want %v", got, tt.want)
}
})
}
}
type secondErrorWriter struct {
count int
}
func (ew *secondErrorWriter) WriteByte(p byte) (err error) {
ew.count += 1
if ew.count == 2 {
return errors.New("write error")
}
return nil
}
func TestEncodeLengthFailed(t *testing.T) {
t.Run("byte write error 1", func(t *testing.T) {
buf := &errorWriter{}
err := encodeLength(buf, 128)
if err == nil {
t.Error("encodeLength() error = nil, want Error")
return
}
})
t.Run("byte write error 2", func(t *testing.T) {
buf := &secondErrorWriter{}
err := encodeLength(buf, 128)
if err == nil {
t.Error("encodeLength() error = nil, want Error")
return
}
})
}
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