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from io import BytesIO
from msgpack import Unpacker, packb, OutOfData
from pytest import raises
def test_unpack_array_header_from_file():
f = BytesIO(packb([1,2,3,4]))
unpacker = Unpacker(f)
assert unpacker.read_array_header() == 4
assert unpacker.unpack() == 1
assert unpacker.unpack() == 2
assert unpacker.unpack() == 3
assert unpacker.unpack() == 4
with raises(OutOfData):
unpacker.unpack()
if __name__ == '__main__':
test_unpack_array_header_from_file()
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