type StubClient struct{}
func (*StubClient) ReadAt(string, []byte, int) (int, error) { return 0, errStubClient }
-func (*StubClient) LocalLocator(string) (string, error) { return "", errStubClient }
+func (*StubClient) LocalLocator(loc string) (string, error) { return loc, nil }
func (*StubClient) BlockWrite(context.Context, BlockWriteOptions) (BlockWriteResponse, error) {
return BlockWriteResponse{}, errStubClient
}