Class FakeBytes

Lib/test/test_format.py:442–444

        # %b will insert a series of bytes, either from a type that supports
        # the Py_buffer protocol, or something that has a __bytes__ method
        class FakeBytes(object):
            def __bytes__(self):
                return b'123'
        fb = FakeBytes()
        testcommon(b"%b", b"abc", b"abc")
        testcommon(b"%b", bytearray(b"def"), b"def")