#include <compare>
#include <cassert>

struct Foo
{
    int x, y;
    auto operator<=>(const Foo&) const = default;
};

int main()
{
    Foo a{1,3}, b{2,1};
	
    assert(
         (a < b)  &&
         (a <= b) &&
        !(a == b) &&
         (a != b) &&
        !(a >= b) &&
        !(a > b)
    );
}