opendrive: run the chunked upload integration tests

Implement SetUploadChunkSizer in the tests so fstests can exercise the
chunked upload path with small chunk sizes.

backend/opendrive/opendrive_internal_test.go

@@ -0,0 +1,17 @@
+package opendrive
+
+import (
+	"github.com/rclone/rclone/fs"
+	"github.com/rclone/rclone/fstest/fstests"
+)
+
+// SetUploadChunkSize changes the configured chunk size, returning the old value.
+//
+// It is only called by the integration tests while no transfer is in progress.
+func (f *Fs) SetUploadChunkSize(cs fs.SizeSuffix) (fs.SizeSuffix, error) {
+	var old fs.SizeSuffix
+	old, f.opt.ChunkSize = f.opt.ChunkSize, cs
+	return old, nil
+}
+
+var _ fstests.SetUploadChunkSizer = (*Fs)(nil)

backend/opendrive/opendrive_test.go

@@ -13,5 +13,8 @@ func TestIntegration(t *testing.T) {
 	fstests.Run(t, &fstests.Opt{
 		RemoteName: "TestOpenDrive:",
 		NilObject:  (*opendrive.Object)(nil),
+		ChunkedUpload: fstests.ChunkedUploadConfig{
+			MinChunkSize: 1,
+		},
 	})
 }