def _read_ustring(fid, n_bytes):
    return np.fromfile(fid, '>B', n_bytes)
Convert x into the appropriate type for these tests.
dataset/ETHPy150Open mne-tools/mne-python/mne/io/ctf/res4.py/_read_ustring--crossover with--dataset/ETHPy150Open PythonCharmers/python-future/tests/test_future/test_buffer.py/MixinBytesBufferCommonTests.marshal