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tests: Add test for io.BufferedWriter.
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‎tests/io/buffered_writer.py‎

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import _io as io
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try:
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io.BytesIO
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io.BufferedWriter
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except AttributeError:
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import sys
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print('SKIP')
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sys.exit()
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bts = io.BytesIO()
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buf = io.BufferedWriter(bts, 8)
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buf.write(b"foobar")
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print(bts.getvalue())
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buf.write(b"foobar")
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# CPython has different flushing policy, so value below is different
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print(bts.getvalue())
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buf.flush()
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print(bts.getvalue())
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buf.flush()
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print(bts.getvalue())

‎tests/io/buffered_writer.py.exp‎

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b''
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b'foobarfo'
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b'foobarfoobar'
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b'foobarfoobar'

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