Method test_sizeof

Lib/test/test_io/test_memoryio.py:870–876

(self)

    @support.cpython_only
    def test_sizeof(self):
        basesize = support.calcobjsize('P2n2Pn')
        check = self.check_sizeof
        self.assertEqual(object.__sizeof__(io.BytesIO()), basesize)
        check(io.BytesIO(), basesize )
        n = 1000  # use a variable to prevent constant folding
        check(io.BytesIO(b'a' * n), basesize + sys.getsizeof(b'a' * n))

    # Various tests of copy-on-write behaviour for BytesIO.