diff --git a/fstest/fstests/fstests.go b/fstest/fstests/fstests.go
index 4f12391b0..b76a59d41 100644
--- a/fstest/fstests/fstests.go
+++ b/fstest/fstests/fstests.go
@@ -18,6 +18,7 @@ import (
 	"path/filepath"
 	"reflect"
 	"sort"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -1571,36 +1572,39 @@ func Run(t *testing.T, opt *Opt) {
 					t.Skip("FS has no PutStream interface")
 				}
 
-				file := fstest.Item{
-					ModTime: fstest.Time("2001-02-03T04:05:06.499999999Z"),
-					Path:    "piped data.txt",
-					Size:    -1, // use unknown size during upload
+				for _, contentSize := range []int{0, 100} {
+					t.Run(strconv.Itoa(contentSize), func(t *testing.T) {
+						file := fstest.Item{
+							ModTime: fstest.Time("2001-02-03T04:05:06.499999999Z"),
+							Path:    "piped data.txt",
+							Size:    -1, // use unknown size during upload
+						}
+
+						var (
+							err        error
+							obj        fs.Object
+							uploadHash *hash.MultiHasher
+						)
+						retry(t, "PutStream", func() error {
+							contents := random.String(contentSize)
+							buf := bytes.NewBufferString(contents)
+							uploadHash = hash.NewMultiHasher()
+							in := io.TeeReader(buf, uploadHash)
+
+							file.Size = -1
+							obji := object.NewStaticObjectInfo(file.Path, file.ModTime, file.Size, true, nil, nil)
+							obj, err = remote.Features().PutStream(ctx, in, obji)
+							return err
+						})
+						file.Hashes = uploadHash.Sums()
+						file.Size = int64(contentSize) // use correct size when checking
+						file.Check(t, obj, remote.Precision())
+						// Re-read the object and check again
+						obj = findObject(ctx, t, remote, file.Path)
+						file.Check(t, obj, remote.Precision())
+						require.NoError(t, obj.Remove(ctx))
+					})
 				}
-
-				var (
-					err         error
-					obj         fs.Object
-					uploadHash  *hash.MultiHasher
-					contentSize = 100
-				)
-				retry(t, "PutStream", func() error {
-					contents := random.String(contentSize)
-					buf := bytes.NewBufferString(contents)
-					uploadHash = hash.NewMultiHasher()
-					in := io.TeeReader(buf, uploadHash)
-
-					file.Size = -1
-					obji := object.NewStaticObjectInfo(file.Path, file.ModTime, file.Size, true, nil, nil)
-					obj, err = remote.Features().PutStream(ctx, in, obji)
-					return err
-				})
-				file.Hashes = uploadHash.Sums()
-				file.Size = int64(contentSize) // use correct size when checking
-				file.Check(t, obj, remote.Precision())
-				// Re-read the object and check again
-				obj = findObject(ctx, t, remote, file.Path)
-				file.Check(t, obj, remote.Precision())
-				require.NoError(t, obj.Remove(ctx))
 			})
 
 			// TestInternal calls InternalTest() on the Fs