def _runtest(format, nbytes, expected_header, expected_prefix, use_bin_type):
# create a new array
original_array = array(format)
original_array.fromlist([255] * (nbytes // original_array.itemsize))
original_data = get_data(original_array)
view = make_memoryview(original_array)
# pack, unpack, and reconstruct array
packed = packb(view, use_bin_type=use_bin_type)
unpacked = unpackb(packed)
reconstructed_array = make_array(format, unpacked)
# check that we got the right amount of data
assert len(original_data) == nbytes
# check packed header
assert packed[:1] == expected_header
# check packed length prefix, if any
assert packed[1:1+len(expected_prefix)] == expected_prefix
# check packed data
assert packed[1+len(expected_prefix):] == original_data
# check array unpacked correctly
assert original_array == reconstructed_array
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