Method expandtabs

Lib/test/test_bytes.py:2747–2750

(b, a)

            assert not c or c[0x20000] not in (0xdd, 0xcd)

        def expandtabs(b, a):
            b.wait()
            c = a.expandtabs()
            assert not c or c[0] not in (0xdd, 0xcd)

        def ljust(b, a):
            b.wait()