Following the implementation of QTBUG-98873, I would also like a QCOMPARE macro that tests my C++20 spaceship operators <=>. It's tedious to use the moral equivalents of

QVERIFY((a <=> b) == r);
QCOMPARE(a <=> b, r);

esp since the std::*_ordering types don't support comparing two objects of their type with each other.

Locally, I have defined me a

#define COMPARE_3WAY(a, b, r) \
    do {  \
        static_assert(std::is_same_v<decltype((a) <=> (b)), decltype(r)>) ; \
        const auto actual = (a) <=> (b); \
        QCOMPARE(std::is_eq(actual), std::is_eq(r); \
        QCOMPARE(std::is_lt(actual), std::is_lt(r); \
        QCOMPARE(std::is_gt(actual), std::is_gt(r); \
   } while (0)

But that, of course, doesn't output the values of a, b, and r upon failure, and doesn't work with strong_ordering::equivalent).