Testing of gmpy2 mpz to_binary and from_binary
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    >>> import gmpy2
    >>> from gmpy2 import mpz,to_binary,from_binary

Test
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    >>> x=mpz(1);x==from_binary(to_binary(x))
    True
    >>> x=mpz(0);x==from_binary(to_binary(x))
    True
    >>> x=mpz(-1);x==from_binary(to_binary(x))
    True
    >>> x=mpz(123456789123456789);x==from_binary(to_binary(x))
    True