Testing of gmpy2 mpq to_binary and from_binary
----------------------------------------------

    >>> import gmpy2
    >>> from gmpy2 import mpq,to_binary,from_binary

Test
----

    >>> x=mpq(0,1);x==from_binary(to_binary(x))
    True
    >>> x=mpq(1,1);x==from_binary(to_binary(x))
    True
    >>> x=mpq(-1,2);x==from_binary(to_binary(x))
    True
    >>> x=mpq(123456789123456789,9876);x==from_binary(to_binary(x))
    True