data/file/file_test.go | 32 ++++++++++++++++++++++++++++++++

diff --git a/data/file/file_test.go b/data/file/file_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..52e345b02443de7f1de86af72713d849da126b70
--- /dev/null
+++ b/data/file/file_test.go
@@ -0,0 +1,32 @@
+package file
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/anacrolix/torrent/metainfo"
+)
+
+func TestShortFile(t *testing.T) {
+	td, err := ioutil.TempDir("", "")
+	require.NoError(t, err)
+	defer os.RemoveAll(td)
+	data := TorrentData(&metainfo.Info{
+		Name:   "a",
+		Length: 2,
+	}, td)
+	f, err := os.Create(filepath.Join(td, "a"))
+	err = f.Truncate(1)
+	f.Close()
+	var buf bytes.Buffer
+	n, err := io.Copy(&buf, io.NewSectionReader(data, 0, 2))
+	assert.EqualValues(t, 1, n)
+	assert.Equal(t, io.ErrUnexpectedEOF, err)
+}