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import pytest
from aiofiles import stderr, stderr_bytes, stdin, stdin_bytes, stdout, stdout_bytes
async def test_stdio(capsys):
await stdout.write("hello")
await stderr.write("world")
out, err = capsys.readouterr()
assert out == "hello"
assert err == "world"
with pytest.raises(OSError):
await stdin.read()
async def test_stdio_bytes(capsysbinary):
await stdout_bytes.write(b"hello")
await stderr_bytes.write(b"world")
out, err = capsysbinary.readouterr()
assert out == b"hello"
assert err == b"world"
with pytest.raises(OSError):
await stdin_bytes.read()
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