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