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package readers
import (
"bytes"
"io"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestRepeatableReader(t *testing.T) {
var dst []byte
var n int
var pos int64
var err error
b := []byte("Testbuffer")
buf := bytes.NewBuffer(b)
r := NewRepeatableReader(buf)
dst = make([]byte, 100)
n, err = r.Read(dst)
assert.Nil(t, err)
assert.Equal(t, 10, n)
require.Equal(t, b, dst[0:10])
// Test read EOF
n, err = r.Read(dst)
assert.Equal(t, io.EOF, err)
assert.Equal(t, 0, n)
// Test Seek Back to start
dst = make([]byte, 10)
pos, err = r.Seek(0, io.SeekStart)
assert.Nil(t, err)
require.Equal(t, 0, int(pos))
n, err = r.Read(dst)
assert.Nil(t, err)
assert.Equal(t, 10, n)
require.Equal(t, b, dst)
// Test partial read
buf = bytes.NewBuffer(b)
r = NewRepeatableReader(buf)
dst = make([]byte, 5)
n, err = r.Read(dst)
assert.Nil(t, err)
assert.Equal(t, 5, n)
require.Equal(t, b[0:5], dst)
n, err = r.Read(dst)
assert.Nil(t, err)
assert.Equal(t, 5, n)
require.Equal(t, b[5:], dst)
// Test Seek
buf = bytes.NewBuffer(b)
r = NewRepeatableReader(buf)
// Should not allow seek past cache index
pos, err = r.Seek(5, io.SeekCurrent)
assert.NotNil(t, err)
assert.Equal(t, "fs.RepeatableReader.Seek: offset is unavailable", err.Error())
assert.Equal(t, 0, int(pos))
// Should not allow seek to negative position start
pos, err = r.Seek(-1, io.SeekCurrent)
assert.NotNil(t, err)
assert.Equal(t, "fs.RepeatableReader.Seek: negative position", err.Error())
assert.Equal(t, 0, int(pos))
// Should not allow seek with invalid whence
pos, err = r.Seek(0, 3)
assert.NotNil(t, err)
assert.Equal(t, "fs.RepeatableReader.Seek: invalid whence", err.Error())
assert.Equal(t, 0, int(pos))
// Should seek from index with io.SeekCurrent(1) whence
dst = make([]byte, 5)
_, _ = r.Read(dst)
pos, err = r.Seek(-3, io.SeekCurrent)
assert.Nil(t, err)
require.Equal(t, 2, int(pos))
pos, err = r.Seek(1, io.SeekCurrent)
assert.Nil(t, err)
require.Equal(t, 3, int(pos))
// Should seek from cache end with io.SeekEnd(2) whence
pos, err = r.Seek(-3, io.SeekEnd)
assert.Nil(t, err)
require.Equal(t, 2, int(pos))
// Should read from seek position and past it
dst = make([]byte, 5)
n, err = io.ReadFull(r, dst)
assert.Nil(t, err)
assert.Equal(t, 5, n)
assert.Equal(t, b[2:7], dst)
}
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