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from rich._null_file import NullFile
def test_null_file():
file = NullFile()
with file:
assert file.write("abc") == 0
assert file.close() is None
assert not file.isatty()
assert file.read() == ""
assert not file.readable()
assert file.readline() == ""
assert file.readlines() == []
assert file.seek(0, 0) == 0
assert not file.seekable()
assert file.tell() == 0
assert file.truncate() == 0
assert file.writable() == False
assert file.writelines([""]) is None
assert next(file) == ""
assert next(iter(file)) == ""
assert file.fileno() == -1
assert file.flush() is None
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