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import pytest
class AbstractOpenTests:
def test_open_exclusive(self, fs, fs_target):
with fs.open(fs_target, "wb") as f:
f.write(b"data")
with fs.open(fs_target, "rb") as f:
assert f.read() == b"data"
with pytest.raises(FileExistsError):
fs.open(fs_target, "xb")
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