huaweidrive: run the chunked upload integration tests

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

backend/huaweidrive/huaweidrive_test.go

@@ -19,15 +19,49 @@ import (
 	"github.com/rclone/rclone/lib/encoder"
 )
 
+// Limits on the chunk size accepted by the resumable upload API
+const (
+	minChunkSize = 256 * fs.Kibi
+	maxChunkSize = 64 * fs.Mebi
+)
+
 // TestIntegration runs integration tests against the remote
 func TestIntegration(t *testing.T) {
 	fstests.Run(t, &fstests.Opt{
 		RemoteName:               "TestHuaweiDrive:",
 		NilObject:                (*Object)(nil),
 		SkipBadWindowsCharacters: true,
+		ChunkedUpload: fstests.ChunkedUploadConfig{
+			MinChunkSize:  minChunkSize,
+			MaxChunkSize:  maxChunkSize,
+			CeilChunkSize: fstests.NextPowerOfTwo,
+		},
 	})
 }
 
+// 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
+}
+
+// SetUploadCutoff changes the configured upload cutoff, returning the old value.
+//
+// It is only called by the integration tests while no transfer is in progress.
+func (f *Fs) SetUploadCutoff(cutoff fs.SizeSuffix) (fs.SizeSuffix, error) {
+	var old fs.SizeSuffix
+	old, f.opt.UploadCutoff = f.opt.UploadCutoff, cutoff
+	return old, nil
+}
+
+var (
+	_ fstests.SetUploadChunkSizer = (*Fs)(nil)
+	_ fstests.SetUploadCutoffer   = (*Fs)(nil)
+)
+
 // TestNewFs tests the NewFs constructor
 func TestNewFs(t *testing.T) {
 	ctx := context.Background()