def METHOD_NAME(self):
    rfs = self.repoPrx.file(self.repo_filename, "rw")
    assert rfs.size() == 0
    wbytes = b"0123456789"
    rfs.write(wbytes, 0, len(wbytes))
    assert rfs.size() == len(wbytes)
    end = rfs.size()
    rfs.write(wbytes, end, len(wbytes))
    assert rfs.size() == 2 * len(wbytes)
    rbytes = rfs.read(0, 2 * len(wbytes))
    assert wbytes + wbytes == rbytes