def test_buffered_input_stream_detach_non_seekable():
# detach() to a non-seekable file (io::InputStream in C++)
f = pa.BufferedInputStream(
pa.BufferedInputStream(pa.BufferReader(b"123456789"), buffer_size=4),
buffer_size=4)
assert f.read(2) == b"12"
raw = f.detach()
assert f.closed
assert not raw.closed
assert not raw.seekable()
assert raw.read(4) == b"5678"
with pytest.raises(EnvironmentError):
raw.seek(2)
def test_buffered_input_stream():
raw = pa.BufferReader(b"123456789")
f = pa.BufferedInputStream(raw, buffer_size=4)
assert f.read(2) == b"12"
assert raw.tell() == 4
f.close()
assert f.closed
assert raw.closed
def test_buffered_input_stream_detach_seekable():
# detach() to a seekable file (io::RandomAccessFile in C++)
f = pa.BufferedInputStream(pa.BufferReader(b"123456789"), buffer_size=4)
assert f.read(2) == b"12"
raw = f.detach()
assert f.closed
assert not raw.closed
assert raw.seekable()
assert raw.read(4) == b"5678"
raw.seek(2)
assert raw.read(4) == b"3456"
