circuitpython/tests/basics/io_buffered_writer.py

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import uio as io
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try:
io.BytesIO
io.BufferedWriter
except AttributeError:
print('SKIP')
raise SystemExit
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bts = io.BytesIO()
buf = io.BufferedWriter(bts, 8)
buf.write(b"foobar")
print(bts.getvalue())
buf.write(b"foobar")
# CPython has different flushing policy, so value below is different
print(bts.getvalue())
buf.flush()
print(bts.getvalue())
buf.flush()
print(bts.getvalue())
# special case when alloc is a factor of total buffer length
bts = io.BytesIO()
buf = io.BufferedWriter(bts, 1)
buf.write(b"foo")
print(bts.getvalue())