rclone/lib/readers/fakeseeker_test.go

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package readers
import (
"bytes"
"io"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
// Check interface
var _ io.ReadSeeker = &FakeSeeker{}
func TestFakeSeeker(t *testing.T) {
// Test that passing in an io.ReadSeeker just passes it through
bufReader := bytes.NewReader([]byte{1})
r := NewFakeSeeker(bufReader, 5)
assert.Equal(t, r, bufReader)
in := bytes.NewBufferString("hello")
buf := make([]byte, 16)
r = NewFakeSeeker(in, 5)
assert.NotEqual(t, r, in)
// check the seek offset is as passed in
checkPos := func(pos int64) {
abs, err := r.Seek(0, io.SeekCurrent)
require.NoError(t, err)
assert.Equal(t, pos, abs)
}
// Test some seeking
checkPos(0)
abs, err := r.Seek(2, io.SeekStart)
require.NoError(t, err)
assert.Equal(t, int64(2), abs)
checkPos(2)
abs, err = r.Seek(-1, io.SeekEnd)
require.NoError(t, err)
assert.Equal(t, int64(4), abs)
checkPos(4)
// Check can't read if not at start
_, err = r.Read(buf)
require.ErrorContains(t, err, "not at start")
// Seek back to start
abs, err = r.Seek(-4, io.SeekCurrent)
require.NoError(t, err)
assert.Equal(t, int64(0), abs)
checkPos(0)
_, err = r.Seek(42, 17)
require.ErrorContains(t, err, "invalid whence")
_, err = r.Seek(-1, io.SeekStart)
require.ErrorContains(t, err, "negative position")
// Test reading now seeked back to the start
n, err := r.Read(buf)
require.NoError(t, err)
assert.Equal(t, 5, n)
assert.Equal(t, []byte("hello"), buf[:5])
// Seeking should give an error now
_, err = r.Seek(-1, io.SeekEnd)
require.ErrorContains(t, err, "after reading")
}
func TestFakeSeekerError(t *testing.T) {
in := bytes.NewBufferString("hello")
r := NewFakeSeeker(in, 5)
assert.NotEqual(t, r, in)
buf, err := io.ReadAll(r)
require.NoError(t, err)
assert.Equal(t, []byte("hello"), buf)
_, err = r.Read(buf)
assert.Equal(t, io.EOF, err)
_, err = r.Seek(0, io.SeekStart)
assert.Equal(t, io.EOF, err)
}