Optimize for files larger than 16MiB

1 files changed, 18 insertions, 0 deletions

diff --git a/fs_test.go b/fs_test.go
index 550c199..7e9765c 100644
--- a/fs_test.go
+++ b/fs_test.go
@@ -1,6 +1,7 @@
 package s3
 
 import (
+	cryptorand "crypto/rand"
 	"errors"
 	"io"
 	"os"
@@ -98,6 +99,23 @@ func TestFsWriteError(t *testing.T) {
 	is.Equal(err, os.ErrNotExist)
 }
 
+func TestFsWrite17MB(t *testing.T) {
+	is := is.New(t)
+	afs, cleanup := newTestAfs()
+	defer cleanup()
+
+	f, err := afs.Fs.Create("dir/file")
+	is.NoErr(err)
+	r := io.LimitReader(cryptorand.Reader, 17*(1<<20))
+	_, err = io.Copy(f, r)
+	is.NoErr(err)
+	err = f.Close()
+	is.NoErr(err)
+	info, err := afs.Stat("dir/file")
+	is.NoErr(err)
+	is.Equal(info.Size(), int64(17*(1<<20)))
+}
+
 func TestFsStat(t *testing.T) {
 	is := is.New(t)
 	afs, cleanup := newTestAfs()