def test_empty(self):
buffer = ByteBuffer()
assert buffer.empty() is True
buffer.write(b"abc")
assert buffer.empty() is False
buffer.discard()
assert buffer.empty() is True
def test_discard_all(self):
buffer = ByteBuffer()
buffer.write(b"abcdefghi")
assert buffer.discard() is None
assert buffer.read() == b""