def test_simple_write():
buff = WriteBuffer(10)
buff.write_bytes(b'hello ')
buff.write_bytes(b'world')
assert buff.value == b'hello world'
assert buff.length == 11
def test_write_clear():
buff = WriteBuffer(10)
buff.write_bytes(b'foo')
buff.clear()
assert buff.value == b''
assert buff.capacity == 10
assert buff.length == 0
